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Bioactive Amino-Quinazolines: Synthesis and Therapeutic Applications

Abstract

The amino-quinazoline scaffold stands out as a privileged structure in Medicinal Chemistry, due to its pleiotropic pharmacological profile. It has been explored in the design and development of novel drug candidates for several therapeutic applications, including antihypertensive, anti-inflammatory, antipsychotic, anti-Alzheimer, anticancer, antiviral, antibiotic, and antiparasitic treatments, among others. The therapeutic value of amino-quinazoline drugs was first demonstrated with the use of alpha 1-adrenoceptor antagonists, such as prazosin, doxazosin and terazosin. These drugs were initially approved for the treatment of hypertension and later for the treatment of benign prostatic hyperplasia. Several amino-quinazoline kinase inhibitors were introduced into the clinic as innovative therapeutic alternatives for cancer treatment after the U.S. Food and Drug Administration approved gefitinib in 2003 as a novel epidermal growth factor receptor inhibitor drug for non-small cell lung cancer. More recently, in 2021, the kinase inhibitor belumosudil was launched as a third-line therapy for adult and pediatric patients with chronic graft-versus-host disease. This article reviews the synthetic preparation methods and pharmacological activities of bioactive amino-quinazolines described in recent decades.

Keywords:
amino-quinazoline; bioactive; drug; heterocycle; quinazoline; synthesis


1. Introduction

The amino-quinazoline scaffold stands out as a privileged structure in Medicinal Chemistry due to its’ pleiotropic pharmacological profile.11 Duarte, C. D.; Barreiro, E. J.; Fraga, C. A. M.; Mini-Rev. Med. Chem. 2007, 7, 1108. [Crossref]
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,22 Khan, I.; Zaib, S.; Batool, S.; Abbas, N.; Ashraf, Z.; Iqbal, J.; Saeed, A.; Bioorg. Med. Chem. 2016, 24, 2361. [Crossref]
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,33 Das, D.; Hong, J.; Eur. J. Med. Chem. 2019, 170, 55. [Crossref]
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,44 Cavalli, A.; Lizzi, F.; Bongarzone, S.; Brun, R.; Krauth-Siegel, R. L.; Bolognesi, M. L.; Bioorg. Med. Chem. Lett. 2009, 19, 3031. [Crossref]
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It has been extensively studied for the design and development of novel drug candidates for various therapeutic applications, such as antihypertensive,55 Jain, K. S.; Bariwal, J. B.; Kathiravan, M. K.; Phoujdar, M. S.; Sahne, R. S.; Chauhan, B. S.; Shah, A. K.; Yadav, M. R.; Bioorg. Med. Chem. 2008, 16, 4759. [Crossref]
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anti-inflammatory,66 Smits, R. A.; Adami, M.; Istyastono, E. P.; Zuiderveld, O. P.; van Dam, C. M. E.; de Kanter, F. J. J.; Jongejan, A.; Coruzzi, G.; Leurs, R.; de Esch, I. J. P.; J. Med. Chem. 2010, 53, 2390. [Crossref]
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antipsychotic,77 Deng, X.; Guo, L.; Xu, L.; Zhen, X.; Yu, K.; Zhao, W.; Fu, W.; Bioorg. Med. Chem. Lett. 2015, 25, 3970. [Crossref]
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anti-Alzheimer,88 Mohamed, T.; Mann, M. K.; Rao, P. P. N.; RSC Adv. 2017, 7, 22360. [Crossref]
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anticancer,99 Barbosa, M. L. C.; Lima, L. M.; Tesch, R.; Sant’Anna, C. M. R.; Totzke, F.; Kubbutat, M. H. G.; Schächtele, C.; Laufer, S. A.; Barreiro, E. J.; Eur. J. Med. Chem. 2014, 71, 1. [Crossref]
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antiviral,1010 Zheng, X.; Gao, L.; Wang, L.; Liang, C.; Wang, B.; Liu, Y.; Feng, S.; Zhang, B.; Zhou, M.; Yu, X.; Xiang, K.; Chen, L.; Guo, T.; Shen, H. C.; Zou, G.; Wu, J. Z.; Yun, H.; J. Med. Chem. 2019, 62, 6003. [Crossref]
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antibiotic,1111 Fleeman, R.; Van Horn, K. S.; Barber, M. M.; Burda, W. N.; Flanigan, D. L.; Manetsch, R.; Shaw, L. N.; Antimicrob. Agents Chemother. 2017, 61, 10.1128/aac.00059-17. [Crossref]
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antiparasitic,1212 da Silva, E. B.; Rocha, D. A.; Fortes, I. S.; Yang, W.; Monti, L.; Siqueira-Neto, J. L.; Caffrey, C. R.; McKerrow, J.; Andrade, S. F.; Ferreira, R. S.; J. Med. Chem. 2021, 64, 13054. [Crossref]
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among others. The therapeutic value of amino-quinazoline drugs was first demonstrated through their use as alpha 1-adrenoceptor antagonists. By 1988, five drugs containing the amino-quinazoline subunit (1-5) with this mechanism of action had been approved (Figure 1), initially for the treatment of hypertension and later for the treatment of benign prostatic hyperplasia (BPH).1313 Minarini, A.; Bolognesi, M. L.; Tumiatti, V.; Melchiorre, C.; Expert Opin. Drug. Discovery 2006, 1, 395. [Crossref]
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,1414 Ruffolo Jr., R. R.; Bondinell, W.; Hieble, J. P.; J. Med. Chem. 1995, 38, 3681. [Crossref]
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Figure 1
Alpha 1-adrenoceptor antagonists approved drugs containing the amino-quinazoline structure.

Over the past 30 years, several studies have demonstrated the effectiveness and therapeutic value of amino-quinazoline derivatives as kinase inhibitors. This core is present in several anticancer drugs on the market (Figure 2), including gefitinib (6), erlotinib (7), lapatinib (8), icotinib (9), vandetanib (10), afatinib (11), dacomitinib (12), and tucatinib (13), which are useful in the treatment of lung, breast, colon, and prostate malignancies.33 Das, D.; Hong, J.; Eur. J. Med. Chem. 2019, 170, 55. [Crossref]
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After the U.S. Food and Drug Administration (FDA) approved gefitinib (6) as a novel epidermal growth factor receptor (EGFR) inhibitor for non-small cell lung cancer (NSCLC) in 2003, several amino-quinazoline kinase inhibitors have been introduced into the clinic as innovative therapeutic alternatives for cancer treatment. This development has significantly expanded the range of treatment options available for NSCLC patients.1515 Bhatia, P.; Sharma, V.; Alam, O.; Manaithiya, A.; Alam, P.; Kahksha; Alam, M. T.; Imran, M.; Eur. J. Med. Chem. 2020, 204, 112640. [Crossref]
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More recently, in 2021, the rho kinase (ROCK) inhibitor belumosudil (14) was introduced as a third-line therapy for adult and pediatric patients with chronic graft-versus-host disease (cGVHD).1616 Ali, F.; Ilyas, A.; Curr. Res. Transl. Med. 2022, 70, 103343. [Crossref]
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Figure 2
Timeline of approved amino-quinazoline kinase inhibitors. EGFR: epidermal growth factor receptor; HER2: receptor tyrosine-protein kinase erbB-2; HER4: receptor tyrosine-protein kinase erbB-4; ROCK: rho-associated protein kinase.

Numerous synthetic methods have been described1717 Khan, I.; Ibrar, A.; Ahmed, W.; Saeed, A.; Eur. J. Med. Chem. 2015, 90, 124. [Crossref]
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,1818 Khan, I.; Ibrar, A.; Abbas, N.; Saeed, A.; Eur. J. Med. Chem. 2014, 76, 193. [Crossref]
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for preparing of amino-quinazoline compounds due to their relevant biological and pharmacological applications. The most common methods involve readily available chemicals, such as benzoic acid, anthranilic acid, and benzonitrile derivatives for cyclization reactions.1919 Boddapati, S. N. M.; Bollikolla, H. B.; Bhavani, K. G.; Saini, H. S.; Ramesh, N.; Jonnalagadda, S. B.; Arabian J. Chem. 2023, 16, 105190. [Crossref]
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,2020 Elslager, E. F.; Johnson, J. L.; Werbel, L. M.; J. Med. Chem. 1983, 26, 1753. [Crossref]
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,2121 Zhang, Y.; Tortorella, M. D.; Liao, J.; Qin, X.; Chen, T.; Luo, J.; Guan, J.; Talley, J. J.; Tu, Z.; ACS Med. Chem. Lett. 2015, 6, 1086. [Crossref]
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This provides the target compounds and/or the corresponding starting materials for subsequent aryl halide substitution reactions such as nucleophilic aromatic substitutions (SNAr), Buchwald-Hartwig couplings, and others.99 Barbosa, M. L. C.; Lima, L. M.; Tesch, R.; Sant’Anna, C. M. R.; Totzke, F.; Kubbutat, M. H. G.; Schächtele, C.; Laufer, S. A.; Barreiro, E. J.; Eur. J. Med. Chem. 2014, 71, 1. [Crossref]
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,2222 Ma, Z.; Lin, Y.; Cheng, Y.; Wu, W.; Cai, R.; Chen, S.; Shi, B.; Han, B.; Shi, X.; Zhou, Y. ; Du, L.; Li, M.; J. Med. Chem. 2016, 59, 2151. [Crossref]
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These chemical transformations provide easy access to the amino-quinazoline scaffold and offer efficient ways to improve amino-quinazoline structural diversity.22 Khan, I.; Zaib, S.; Batool, S.; Abbas, N.; Ashraf, Z.; Iqbal, J.; Saeed, A.; Bioorg. Med. Chem. 2016, 24, 2361. [Crossref]
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This work presents a review of the literature, starting with an overview of the main synthetic methods used to obtain bioactive amino-quinazolines in the last decade. The following sections highlight key examples of bioactive amino-quinazolines described from 1994-2023. This approach aims to provide readers a perspective on the progress of Medicinal Chemistry related to this privileged structure.

2. Methods

A literature survey was carried out using CAS SciFindern search tool2323 CAS SciFindern, https://scifinder.cas.org, accessed in May 2024.
https://scifinder.cas.org...
available through the Periódicos Portal da CAPES (BR), covering the CAplus and Medline databases. The survey focused on synthetic methodologies and therapeutic applications for bioactive amino-quinazolines described in the scientific literature over the last three decades was performed. The bibliographic search was conducted in August 2023 and updated in October 2023.

The search strategy included the following descriptors: “quinazol*”[Title] OR “aminoquinazol*”[Title] AND “bioactive”[Abstract/Keywords] OR “drug”[Abstract/Keywords], resulting in a total of 1,814 references. The following initial eligibility criteria included publications in English (1,381 references); publication period from 1994 to 2023 (1,286 references); and document types Journal or Review (1,127 references). The number of publications has significantly increased over the years. There were 48 results for the first decade (1994-2003), 253 results for the second decade (2004-2013) and 826 results for the most recent decade (2014-2023) (Figure 3).

Figure 3
Increasing number of publications related to the amino-quinazoline privileged structure over the last three decades.

A detailed analysis of the contents of references was subsequently performed to confirm their eligibility and relevance for the scope of this review. The final selection of articles occurred in two main steps. First, the titles and abstracts of the identified references were read, and potentially eligible studies were pre-selected. Second, the full texts were read to confirm eligibility and make the final selection for discussion in this review. References covering bioactive derivatives of the quinazolinone chemical class or related chemical structures were excluded. Finally, elected references discussing the synthesis and therapeutic applications of bioactive amino-quinazolines were summarized and discussed in this review.

3. Overview of Recent Synthetic Methods to Obtain Bioactive Amino-Quinazolines

Due to the well-established activity of amino-quinazoline derivatives, synthetic methods to obtain this chemotype are thoroughly documented. Starting from derivatives of anthranilic acid (15), the main synthetic route for these compounds involves the synthesis of key 4-quinazolinone intermediates (16-17) (Scheme 1), which are subject to chlorination reaction and are then appropriately functionalized.2727 Shao, J.; Chen, E.; Shu, K.; Chen, W.; Zhang, G.; Yu, Y.; Bioorg. Med. Chem. 2016, 24, 3359. [Crossref]
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,2828 Teng, Y.; Li, X.; Ren, S.; Cheng, Y.; Xi, K.; Shen, H.; Ma, W.; Luo, G.; Xiang, H.; Eur. J. Med. Chem. 2020, 208, 112865. [Crossref]
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,2929 Zhang, Y.; Huang, Y.-J.; Xiang, H.-M.; Wang, P.-Y.; Hu, D.-Y.; Xue, W.; Song, B.-A.; Yang, S.; Eur. J. Med. Chem. 2014, 78, 23. [Crossref]
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This approach is widely used to obtain 4-anilinoquinazolines, such as the approved kinase inhibitors. Starting from anthranilamides (15, R1 = NH2), functionalization in position two of the ring is often achieved through cyclization steps employing aldehydes,3131 Malasala, S.; Ahmad, M. N.; Akunuri, R.; Shukla, M.; Kaul, G.; Dasgupta, A.; Madhavi, Y. V.; Chopra, S.; Nanduri, S.; Eur. J. Med. Chem. 2021, 212, 112996. [Crossref]
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,3232 Krapf, M. K.; Gallus, J.; Spindler, A.; Wiese, M.; Eur. J. Med. Chem. 2019, 161, 506. [Crossref]
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yielding 2-substituted-4-quinazolinones (17). It has also been reported3030 Vedadi, M.; Barsyte-Lovejoy, D.; Liu, F.; Rival-Gervier, S.; Allali-Hassani, A.; Labrie, V.; Wigle, T. J.; DiMaggio, P. A.; Wasney, G. A.; Siarheyeva, A.; Dong, A.; Tempel, W.; Wang, S.-C.; Chen, X.; Chau, I.; Mangano, T. J.; Huang, X.; Simpson, C. D.; Pattenden, S. G.; Norris, J. L.; Kireev, D. B.; Tripathy, A.; Edwards, A.; Roth, B. L.; Janzen, W. P.; Garcia, B. A.; Petronis, A.; Ellis, J.; Brown, P. J.; Frye, S. V; Arrowsmith, C. H.; Jin, J.; Nat. Chem. Biol. 2011, 7, 566. [Crossref]
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that carbonitriles, such as cyclohexanecarbonitrile, react with anthranilic ester derivatives (15, R1 = OMe) to yield 2-functionalized-4-quinazolinones (17). These compounds are further modified to furnish bioactive amino-quinazolines (22). Electrochemical methods have also been reported3535 Cao, L.; Huo, H.; Zeng, H.; Yu, Y.; Lu, D.; Gong, Y.; Adv. Synth. Catal. 2018, 360, 4764. [Crossref]
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,3636 Ghoshal, T.; Arkivoc 2023, 202311987. [Crossref]
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for achieving 2-substituted-4-quinazolinones (17) under mild conditions, at room temperature, in reactions ranging from milligram to gram scale. Regarding alternatives to the use of chlorination agents for achieving functionalization of quinazolinones, it has been reported3737 Shen, Z.-L.; He, X.-F.; Hong, Y.-M.; Hu, X.-Q.; Mo, W.-M.; Hu, B.-X.; Sun, N.; Synth. Commun. 2011, 41, 3644. [Crossref]
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that hexamethyldisilazane is useful for producing 4-aminoquinazolines from quinazolin-4(3H)-ones. The reaction of the quinazolinone intermediates with primary amines lead to the formation of 4-aminoquinazolines via silylation and substitution in a single pot reaction.

Scheme 1
(i) urea, Δ;2424 Hu, H.; Dong, Y.; Li, M.; Wang, R.; Zhang, X.; Gong, P.; Zhao, Y.; Bioorg. Chem. 2019, 90, 103086. [Crossref]
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,2525 Peng, W.; Tu, Z.-C.; Long, Z.-J.; Liu, Q.; Lu, G.; Eur. J. Med. Chem. 2016, 108, 644. [Crossref]
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,2626 Hao, C.; Zhao, F.; Song, H.; Guo, J.; Li, X.; Jiang, X.; Huan, R.; Song, S.; Zhang, Q.; Wang, R.; Wang, K.; Pang, Y.; Liu, T.; Lu, T.; Huang, W.; Wang, J.; Lin, B.; He, Z.; Li, H.; Li, F.; Zhao, D.; Cheng, M.; J. Med. Chem. 2018, 61, 265. [Crossref]
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(ii) (1) AcOH, H2O, (2) KOCN, H2O, (3) NaOH, (4) HClaq 37%;99 Barbosa, M. L. C.; Lima, L. M.; Tesch, R.; Sant’Anna, C. M. R.; Totzke, F.; Kubbutat, M. H. G.; Schächtele, C.; Laufer, S. A.; Barreiro, E. J.; Eur. J. Med. Chem. 2014, 71, 1. [Crossref]
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(iii) carbonyldiimidazole, tetrahydrofuran (THF);99 Barbosa, M. L. C.; Lima, L. M.; Tesch, R.; Sant’Anna, C. M. R.; Totzke, F.; Kubbutat, M. H. G.; Schächtele, C.; Laufer, S. A.; Barreiro, E. J.; Eur. J. Med. Chem. 2014, 71, 1. [Crossref]
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(iv) formamidine acetate, Δ;2727 Shao, J.; Chen, E.; Shu, K.; Chen, W.; Zhang, G.; Yu, Y.; Bioorg. Med. Chem. 2016, 24, 3359. [Crossref]
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,2828 Teng, Y.; Li, X.; Ren, S.; Cheng, Y.; Xi, K.; Shen, H.; Ma, W.; Luo, G.; Xiang, H.; Eur. J. Med. Chem. 2020, 208, 112865. [Crossref]
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(v) N2, toluene, formamide, POCl3;2929 Zhang, Y.; Huang, Y.-J.; Xiang, H.-M.; Wang, P.-Y.; Hu, D.-Y.; Xue, W.; Song, B.-A.; Yang, S.; Eur. J. Med. Chem. 2014, 78, 23. [Crossref]
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(vi) cyclohexanecarbonitrile, dioxane, HCl;3030 Vedadi, M.; Barsyte-Lovejoy, D.; Liu, F.; Rival-Gervier, S.; Allali-Hassani, A.; Labrie, V.; Wigle, T. J.; DiMaggio, P. A.; Wasney, G. A.; Siarheyeva, A.; Dong, A.; Tempel, W.; Wang, S.-C.; Chen, X.; Chau, I.; Mangano, T. J.; Huang, X.; Simpson, C. D.; Pattenden, S. G.; Norris, J. L.; Kireev, D. B.; Tripathy, A.; Edwards, A.; Roth, B. L.; Janzen, W. P.; Garcia, B. A.; Petronis, A.; Ellis, J.; Brown, P. J.; Frye, S. V; Arrowsmith, C. H.; Jin, J.; Nat. Chem. Biol. 2011, 7, 566. [Crossref]
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(vii) RCHO, I2, K2CO3;3131 Malasala, S.; Ahmad, M. N.; Akunuri, R.; Shukla, M.; Kaul, G.; Dasgupta, A.; Madhavi, Y. V.; Chopra, S.; Nanduri, S.; Eur. J. Med. Chem. 2021, 212, 112996. [Crossref]
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,3232 Krapf, M. K.; Gallus, J.; Spindler, A.; Wiese, M.; Eur. J. Med. Chem. 2019, 161, 506. [Crossref]
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,3333 Krapf, M. K.; Gallus, J.; Namasivayam, V.; Wiese, M.; J. Med. Chem. 2018, 61, 7952. [Crossref]
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(viii) formamide, Δ;3434 Jin, Y.; Li, H.-Y.; Lin, L.-P.; Tan, J.; Ding, J.; Luo, X.; Long, Y.-Q.; Bioorg. Med. Chem. 2005, 13, 5613. [Crossref]
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(ix) ethyl oxalyl monochloride, THF, triethylamine;2626 Hao, C.; Zhao, F.; Song, H.; Guo, J.; Li, X.; Jiang, X.; Huan, R.; Song, S.; Zhang, Q.; Wang, R.; Wang, K.; Pang, Y.; Liu, T.; Lu, T.; Huang, W.; Wang, J.; Lin, B.; He, Z.; Li, H.; Li, F.; Zhao, D.; Cheng, M.; J. Med. Chem. 2018, 61, 265. [Crossref]
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(x) EtONa, EtOH;2626 Hao, C.; Zhao, F.; Song, H.; Guo, J.; Li, X.; Jiang, X.; Huan, R.; Song, S.; Zhang, Q.; Wang, R.; Wang, K.; Pang, Y.; Liu, T.; Lu, T.; Huang, W.; Wang, J.; Lin, B.; He, Z.; Li, H.; Li, F.; Zhao, D.; Cheng, M.; J. Med. Chem. 2018, 61, 265. [Crossref]
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(xi) POCl3, Δ;99 Barbosa, M. L. C.; Lima, L. M.; Tesch, R.; Sant’Anna, C. M. R.; Totzke, F.; Kubbutat, M. H. G.; Schächtele, C.; Laufer, S. A.; Barreiro, E. J.; Eur. J. Med. Chem. 2014, 71, 1. [Crossref]
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,2424 Hu, H.; Dong, Y.; Li, M.; Wang, R.; Zhang, X.; Gong, P.; Zhao, Y.; Bioorg. Chem. 2019, 90, 103086. [Crossref]
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,2525 Peng, W.; Tu, Z.-C.; Long, Z.-J.; Liu, Q.; Lu, G.; Eur. J. Med. Chem. 2016, 108, 644. [Crossref]
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,2626 Hao, C.; Zhao, F.; Song, H.; Guo, J.; Li, X.; Jiang, X.; Huan, R.; Song, S.; Zhang, Q.; Wang, R.; Wang, K.; Pang, Y.; Liu, T.; Lu, T.; Huang, W.; Wang, J.; Lin, B.; He, Z.; Li, H.; Li, F.; Zhao, D.; Cheng, M.; J. Med. Chem. 2018, 61, 265. [Crossref]
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,2929 Zhang, Y.; Huang, Y.-J.; Xiang, H.-M.; Wang, P.-Y.; Hu, D.-Y.; Xue, W.; Song, B.-A.; Yang, S.; Eur. J. Med. Chem. 2014, 78, 23. [Crossref]
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,3131 Malasala, S.; Ahmad, M. N.; Akunuri, R.; Shukla, M.; Kaul, G.; Dasgupta, A.; Madhavi, Y. V.; Chopra, S.; Nanduri, S.; Eur. J. Med. Chem. 2021, 212, 112996. [Crossref]
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,3232 Krapf, M. K.; Gallus, J.; Spindler, A.; Wiese, M.; Eur. J. Med. Chem. 2019, 161, 506. [Crossref]
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(xii) SOCl2.2626 Hao, C.; Zhao, F.; Song, H.; Guo, J.; Li, X.; Jiang, X.; Huan, R.; Song, S.; Zhang, Q.; Wang, R.; Wang, K.; Pang, Y.; Liu, T.; Lu, T.; Huang, W.; Wang, J.; Lin, B.; He, Z.; Li, H.; Li, F.; Zhao, D.; Cheng, M.; J. Med. Chem. 2018, 61, 265. [Crossref]
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,2727 Shao, J.; Chen, E.; Shu, K.; Chen, W.; Zhang, G.; Yu, Y.; Bioorg. Med. Chem. 2016, 24, 3359. [Crossref]
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,2828 Teng, Y.; Li, X.; Ren, S.; Cheng, Y.; Xi, K.; Shen, H.; Ma, W.; Luo, G.; Xiang, H.; Eur. J. Med. Chem. 2020, 208, 112865. [Crossref]
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Anthranilic acid derivatives have been reported as starting materials for 2,4-quinazolinodiones (16), which are key intermediates for exploring 2,4-disubstituted quinazolines (21) (Scheme 1).99 Barbosa, M. L. C.; Lima, L. M.; Tesch, R.; Sant’Anna, C. M. R.; Totzke, F.; Kubbutat, M. H. G.; Schächtele, C.; Laufer, S. A.; Barreiro, E. J.; Eur. J. Med. Chem. 2014, 71, 1. [Crossref]
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,2424 Hu, H.; Dong, Y.; Li, M.; Wang, R.; Zhang, X.; Gong, P.; Zhao, Y.; Bioorg. Chem. 2019, 90, 103086. [Crossref]
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,2525 Peng, W.; Tu, Z.-C.; Long, Z.-J.; Liu, Q.; Lu, G.; Eur. J. Med. Chem. 2016, 108, 644. [Crossref]
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,2626 Hao, C.; Zhao, F.; Song, H.; Guo, J.; Li, X.; Jiang, X.; Huan, R.; Song, S.; Zhang, Q.; Wang, R.; Wang, K.; Pang, Y.; Liu, T.; Lu, T.; Huang, W.; Wang, J.; Lin, B.; He, Z.; Li, H.; Li, F.; Zhao, D.; Cheng, M.; J. Med. Chem. 2018, 61, 265. [Crossref]
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,3838 Mohamed, T.; Rao, P. P. N.; Tetrahedron Lett. 2015, 56, 6882. [Crossref]
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In addition, the reaction of 2-anthranilamide (15, R1 = NH2) with ethyl oxalyl monochloride, leading to compound 18, followed by cyclization, has been reported,2626 Hao, C.; Zhao, F.; Song, H.; Guo, J.; Li, X.; Jiang, X.; Huan, R.; Song, S.; Zhang, Q.; Wang, R.; Wang, K.; Pang, Y.; Liu, T.; Lu, T.; Huang, W.; Wang, J.; Lin, B.; He, Z.; Li, H.; Li, F.; Zhao, D.; Cheng, M.; J. Med. Chem. 2018, 61, 265. [Crossref]
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resulting in 2-carbonylated-4-chloroquinazolines. These intermediates were utilized to synthesize 2-carbonylated-4-aminoquinazolines (22) as kinase inhibitors. It has also been reported2828 Teng, Y.; Li, X.; Ren, S.; Cheng, Y.; Xi, K.; Shen, H.; Ma, W.; Luo, G.; Xiang, H.; Eur. J. Med. Chem. 2020, 208, 112865. [Crossref]
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,3333 Krapf, M. K.; Gallus, J.; Namasivayam, V.; Wiese, M.; J. Med. Chem. 2018, 61, 7952. [Crossref]
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that 6-chloroanthranilic acid (15, R1 = OH; R = 6-Cl) can be used to obtain bioactive 5-amino-quinazolines (23) through cyclization reaction with formamide and functionalization through SNAr reactions. The functionalization of chloroquinazolines (19-20) to amino-quinazolines (21-22) was often achieved through SNAr reactions, and metal catalyzed cross-coupling reactions, such as BuchwaldHartwig (Scheme 1).99 Barbosa, M. L. C.; Lima, L. M.; Tesch, R.; Sant’Anna, C. M. R.; Totzke, F.; Kubbutat, M. H. G.; Schächtele, C.; Laufer, S. A.; Barreiro, E. J.; Eur. J. Med. Chem. 2014, 71, 1. [Crossref]
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,2828 Teng, Y.; Li, X.; Ren, S.; Cheng, Y.; Xi, K.; Shen, H.; Ma, W.; Luo, G.; Xiang, H.; Eur. J. Med. Chem. 2020, 208, 112865. [Crossref]
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A useful method for synthesizing bioactive amino-quinazolines involves using 2-aminobenzonitriles (24) as starting material for cyclization reactions. Some authors3838 Mohamed, T.; Rao, P. P. N.; Tetrahedron Lett. 2015, 56, 6882. [Crossref]
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,3939 Zhang, Y.; Gao, H.; Liu, R.; Liu, J.; Chen, L.; Li, X.; Zhao, L.; Wang, W.; Li, B.; Bioorg. Med. Chem. Lett. 2017, 27, 4309. [Crossref]
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,4040 Le-Nhat-Thuy, G.; Thi, N. N.; Pham-The, H.; Thi, T. A. D.; Thi, H. N.; Thi, T. H. N.; Hoang, S. N.; Nguyen, T. V.; Bioorg. Med. Chem. Lett. 2020, 30, 127404. [Crossref]
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,4141 Kumar, A. S.; Kudva, J.; Bharath, B. R.; Rai, V. M.; Kumar, S. M.; Kumar, V.; Sajankila, S. P.; ChemistrySelect 2018, 3, 13586. [Crossref]
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,4242 Das, D.; Xie, L.; Wang, J.; Xu, X.; Zhang, Z.; Shi, J.; Le, X.; Hong, J.; Bioorg. Med. Chem. Lett. 2019, 29, 591. [Crossref]
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,4343 Yoon, D. S.; Han, Y.; Stark, T. M.; Haber, J. C.; Gregg, B. T.; Stankovich, S. B.; Org. Lett. 2004, 6, 4775. [Crossref]
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have reported using dimethylformamide-dimethylacetal (DMF-DMA) to react with 2-aminobenzonitrile, producing intermediate 25. The intermediate 25 is then reacted with arylamines to produce bioactive 4-amino-quinazolines (26). This reaction can also be performed under microwave irradiation conditions, resulting in 4-aminoquinazolines (26) in a shorter time period (Scheme 2).

Scheme 2
(i) DMF-DMA, Δ;3939 Zhang, Y.; Gao, H.; Liu, R.; Liu, J.; Chen, L.; Li, X.; Zhao, L.; Wang, W.; Li, B.; Bioorg. Med. Chem. Lett. 2017, 27, 4309. [Crossref]
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,4040 Le-Nhat-Thuy, G.; Thi, N. N.; Pham-The, H.; Thi, T. A. D.; Thi, H. N.; Thi, T. H. N.; Hoang, S. N.; Nguyen, T. V.; Bioorg. Med. Chem. Lett. 2020, 30, 127404. [Crossref]
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,4141 Kumar, A. S.; Kudva, J.; Bharath, B. R.; Rai, V. M.; Kumar, S. M.; Kumar, V.; Sajankila, S. P.; ChemistrySelect 2018, 3, 13586. [Crossref]
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,4242 Das, D.; Xie, L.; Wang, J.; Xu, X.; Zhang, Z.; Shi, J.; Le, X.; Hong, J.; Bioorg. Med. Chem. Lett. 2019, 29, 591. [Crossref]
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(ii) anilines, Δ or microwave irradiation;3939 Zhang, Y.; Gao, H.; Liu, R.; Liu, J.; Chen, L.; Li, X.; Zhao, L.; Wang, W.; Li, B.; Bioorg. Med. Chem. Lett. 2017, 27, 4309. [Crossref]
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,4040 Le-Nhat-Thuy, G.; Thi, N. N.; Pham-The, H.; Thi, T. A. D.; Thi, H. N.; Thi, T. H. N.; Hoang, S. N.; Nguyen, T. V.; Bioorg. Med. Chem. Lett. 2020, 30, 127404. [Crossref]
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,4141 Kumar, A. S.; Kudva, J.; Bharath, B. R.; Rai, V. M.; Kumar, S. M.; Kumar, V.; Sajankila, S. P.; ChemistrySelect 2018, 3, 13586. [Crossref]
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,4242 Das, D.; Xie, L.; Wang, J.; Xu, X.; Zhang, Z.; Shi, J.; Le, X.; Hong, J.; Bioorg. Med. Chem. Lett. 2019, 29, 591. [Crossref]
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,4343 Yoon, D. S.; Han, Y.; Stark, T. M.; Haber, J. C.; Gregg, B. T.; Stankovich, S. B.; Org. Lett. 2004, 6, 4775. [Crossref]
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(iii) benzonitriles, t-BuOK, 150 W microwave irradiation;3232 Krapf, M. K.; Gallus, J.; Spindler, A.; Wiese, M.; Eur. J. Med. Chem. 2019, 161, 506. [Crossref]
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(iv) benzoyl chlorides, THF, TEA;3232 Krapf, M. K.; Gallus, J.; Spindler, A.; Wiese, M.; Eur. J. Med. Chem. 2019, 161, 506. [Crossref]
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(v) guanidine hydrochloride, NaOH, Δ;4444 Mendoza-Martínez, C.; Correa-Basurto, J.; Nieto-Meneses, R.; Márquez-Navarro, A.; Aguilar-Suárez, R.; Montero-Cortes, M. D.; Nogueda-Torres, B.; Suárez-Contreras, E.; Galindo-Sevilla, N.; Rojas-Rojas, Á.; Rodriguez-Lezama, A.; Hernández-Luis, F.; Eur. J. Med. Chem. 2015, 96, 296. [Crossref]
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(vi) phenyl isothiocyanates, pyridine, Δ.4545 Hwu, J. R.; Roy, A.; Tsay, S.-C.; Huang, W.-C.; Lin, C.-C.; Hwang, K. C.; Hu, Y.-C.; Shieh, F.-K.; Leyssen, P.; Neyts, J.; Int. J. Mol. Sci. 2022, 23, 7646. [Crossref]
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,4646 Hwu, J. R.; Kapoor, M.; Gupta, N. K.; Tsay, S.-C.; Huang, W.-C.; Tan, K.-T.; Hu, Y.-C.; Lyssen, P.; Neyts, J.; Eur. J. Med. Chem. 2022, 232, 114164. [Crossref]
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,4747 Wang, Z.; Liu, L.; Dai, H.; Si, X.; Zhang, L.; Li, E.; Yang, Z.; Chao, G.; Zheng, J.; Ke, Y.; Lihong, S.; Zhang, Q.; Liu, H.; Bioorg. Med. Chem. 2021, 43, 116265. [Crossref]
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Formamidine intermediates such as 25 have been reported4848 Chandregowda, V.; Rao, G. V.; Reddy, G. C.; Org. Process Res. Dev. 2007, 11, 813. [Crossref]
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to be key to the multigram synthesis of 4-aminoquinazoline drugs such as gefitinib (6). The reaction of this intermediate (25) with anilines to give 4-aminoquinazolines (38) is thought to occur via a Dimroth rearrangement (Scheme 3). After the attack of aniline and the formation of intermediate 33, an intermolecular reaction leads to intermediate 34, which has already been reported in the literature.4848 Chandregowda, V.; Rao, G. V.; Reddy, G. C.; Org. Process Res. Dev. 2007, 11, 813. [Crossref]
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Hydrolysis at C-N3 and subsequent 180° bond rotation around the C10-C4 (36a and 36b) allow ring closure. Subsequent dehydration yields 4-aminoquinazolines (38) (Scheme 3).

Scheme 3
Schematic representation of intermediates involved in the mechanism of Dimroth rearrangement, resulting in 4-aminoquinazolines (38).

4-Amino-quinazoline 27 was also obtained starting from 2-aminobenzonitrile (24) (Scheme 2), followed by amide bond formation with benzoyl chlorides, resulting in the production of several bioactive 4-amino-quinazolines (28).3232 Krapf, M. K.; Gallus, J.; Spindler, A.; Wiese, M.; Eur. J. Med. Chem. 2019, 161, 506. [Crossref]
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Additionally, the reaction of 2-amino-5-nitrobenzonitrile (24, R = 5-NO2) with guanidine hydrochloride has been reported4444 Mendoza-Martínez, C.; Correa-Basurto, J.; Nieto-Meneses, R.; Márquez-Navarro, A.; Aguilar-Suárez, R.; Montero-Cortes, M. D.; Nogueda-Torres, B.; Suárez-Contreras, E.; Galindo-Sevilla, N.; Rojas-Rojas, Á.; Rodriguez-Lezama, A.; Hernández-Luis, F.; Eur. J. Med. Chem. 2015, 96, 296. [Crossref]
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to yield 2,4-amino-quinazolines (29), which were further modified to give bioactive 2,4,6-amino-quinazolines (30). The reaction between 2-aminobenzonitrile (24) and isothiocyanates has been reported4545 Hwu, J. R.; Roy, A.; Tsay, S.-C.; Huang, W.-C.; Lin, C.-C.; Hwang, K. C.; Hu, Y.-C.; Shieh, F.-K.; Leyssen, P.; Neyts, J.; Int. J. Mol. Sci. 2022, 23, 7646. [Crossref]
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,4646 Hwu, J. R.; Kapoor, M.; Gupta, N. K.; Tsay, S.-C.; Huang, W.-C.; Tan, K.-T.; Hu, Y.-C.; Lyssen, P.; Neyts, J.; Eur. J. Med. Chem. 2022, 232, 114164. [Crossref]
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,4747 Wang, Z.; Liu, L.; Dai, H.; Si, X.; Zhang, L.; Li, E.; Yang, Z.; Chao, G.; Zheng, J.; Ke, Y.; Lihong, S.; Zhang, Q.; Liu, H.; Bioorg. Med. Chem. 2021, 43, 116265. [Crossref]
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to furnish 2-thiol-4-amino-quinazolines (31). The thiol group is then utilized as a nucleophile to attach diverse chemical groups, resulting in the production of bioactive amino-quinazolines (32) (Scheme 2).4545 Hwu, J. R.; Roy, A.; Tsay, S.-C.; Huang, W.-C.; Lin, C.-C.; Hwang, K. C.; Hu, Y.-C.; Shieh, F.-K.; Leyssen, P.; Neyts, J.; Int. J. Mol. Sci. 2022, 23, 7646. [Crossref]
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,4646 Hwu, J. R.; Kapoor, M.; Gupta, N. K.; Tsay, S.-C.; Huang, W.-C.; Tan, K.-T.; Hu, Y.-C.; Lyssen, P.; Neyts, J.; Eur. J. Med. Chem. 2022, 232, 114164. [Crossref]
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,4747 Wang, Z.; Liu, L.; Dai, H.; Si, X.; Zhang, L.; Li, E.; Yang, Z.; Chao, G.; Zheng, J.; Ke, Y.; Lihong, S.; Zhang, Q.; Liu, H.; Bioorg. Med. Chem. 2021, 43, 116265. [Crossref]
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Benzaldehyde derivatives (39-41) have been reported4949 Shi, H.; Tang, H.; Li, Y.; Chen, D.; Liu, T.; Chen, Y.; Wang, X.; Chen, L.; Wang, Y.; Xie, H.; Xiong, B.; Eur. J. Med. Chem. 2023, 248, 115064. [Crossref]
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,5050 Wellaway, C. R.; Baldwin, I. R.; Bamborough, P.; Barker, D.; Bartholomew, M. A.; Chung, C.; Dümpelfeld, B.; Evans, J. P.; Fazakerley, N. J.; Homes, P.; Keeling, S. P.; Lewell, X. Q.; McNab, F. W.; Morley, J.; Needham, D.; Neu, M.; van Oosterhout, A. J. M.; Pal, A.; Reinhard, F. B. M.; Rianjongdee, F.; Robertson, C. M.; Rowland, P.; Shah, R. R.; Sherriff, E. B.; Sloan, L. A.; Teague, S.; Thomas, D. A.; Wellaway, N.; Wojno-Picon, J.; Woolven, J. M.; Coe, D. M.; J. Med. Chem. 2022, 65, 633. [Crossref]
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,5151 Qin, Z.-Y.; Sun, C.-X.; Zhang, W.-W.; Li, J.-R.; Gong, Y.-X.; Shu, W.-M.; Wu, A.-X.; Catalysts 2023, 13, 1447. [Crossref]
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as intermediates for synthesizing amino-quinazolines (Scheme 4). Reaction of 4-bromo-2,6-difluorobenzaldehyde (39) with urea, followed by treatment with POCl3 resulted in 7-bromo-2-chloro-5-fluoroquinazoline (42). Similarly, reaction of 2-amino-4-bromo-6-fluorobenzaldehyde (40) with diguanidinium carbonate yielded 7-bromo-5-fluoroquinazolin-2-amine (43). These intermediates were further functionalized to furnish bioactive 2,5-diamino-quinazolines (44).4949 Shi, H.; Tang, H.; Li, Y.; Chen, D.; Liu, T.; Chen, Y.; Wang, X.; Chen, L.; Wang, Y.; Xie, H.; Xiong, B.; Eur. J. Med. Chem. 2023, 248, 115064. [Crossref]
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Additionally, 2-amino-3-bromo-5-iodobenzaldehyde (41) was reported5050 Wellaway, C. R.; Baldwin, I. R.; Bamborough, P.; Barker, D.; Bartholomew, M. A.; Chung, C.; Dümpelfeld, B.; Evans, J. P.; Fazakerley, N. J.; Homes, P.; Keeling, S. P.; Lewell, X. Q.; McNab, F. W.; Morley, J.; Needham, D.; Neu, M.; van Oosterhout, A. J. M.; Pal, A.; Reinhard, F. B. M.; Rianjongdee, F.; Robertson, C. M.; Rowland, P.; Shah, R. R.; Sherriff, E. B.; Sloan, L. A.; Teague, S.; Thomas, D. A.; Wellaway, N.; Wojno-Picon, J.; Woolven, J. M.; Coe, D. M.; J. Med. Chem. 2022, 65, 633. [Crossref]
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as an intermediate for synthesizing 8-bromo-2-chloro-6-iodoquinazoline (45) using urea and POCl3. Intermediate 45 was then used to produce bioactive 2,8-diamino-quinazolines (46).

Scheme 4
(i) Diguanidinium carbonate, diisopropylethylamine (DIPEA), N-methyl-2-pyrrolidone, Δ;4949 Shi, H.; Tang, H.; Li, Y.; Chen, D.; Liu, T.; Chen, Y.; Wang, X.; Chen, L.; Wang, Y.; Xie, H.; Xiong, B.; Eur. J. Med. Chem. 2023, 248, 115064. [Crossref]
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(ii) urea, then POCl3;4949 Shi, H.; Tang, H.; Li, Y.; Chen, D.; Liu, T.; Chen, Y.; Wang, X.; Chen, L.; Wang, Y.; Xie, H.; Xiong, B.; Eur. J. Med. Chem. 2023, 248, 115064. [Crossref]
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,5050 Wellaway, C. R.; Baldwin, I. R.; Bamborough, P.; Barker, D.; Bartholomew, M. A.; Chung, C.; Dümpelfeld, B.; Evans, J. P.; Fazakerley, N. J.; Homes, P.; Keeling, S. P.; Lewell, X. Q.; McNab, F. W.; Morley, J.; Needham, D.; Neu, M.; van Oosterhout, A. J. M.; Pal, A.; Reinhard, F. B. M.; Rianjongdee, F.; Robertson, C. M.; Rowland, P.; Shah, R. R.; Sherriff, E. B.; Sloan, L. A.; Teague, S.; Thomas, D. A.; Wellaway, N.; Wojno-Picon, J.; Woolven, J. M.; Coe, D. M.; J. Med. Chem. 2022, 65, 633. [Crossref]
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(iii) HCl, HFIP, Δ;5151 Qin, Z.-Y.; Sun, C.-X.; Zhang, W.-W.; Li, J.-R.; Gong, Y.-X.; Shu, W.-M.; Wu, A.-X.; Catalysts 2023, 13, 1447. [Crossref]
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(iv) cynamide, para-toluenesulfonic acid, DMF, Δ;5252 Pandya, A. N.; Villa, E. M.; North, E. J.; Tetrahedron Lett. 2017, 58, 1276. [Crossref]
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(v) 4-morpholinecarbonitrile or 1-piperidinecarbonitrile, KOtBU DMF, Δ;5252 Pandya, A. N.; Villa, E. M.; North, E. J.; Tetrahedron Lett. 2017, 58, 1276. [Crossref]
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(vi) aq. ammonia, CuI, DMSO, O2.5353 Malasala, S.; Gour, J.; Ahmad, Md. N.; Gatadi, S.; Shukla, M.; Kaul, G.; Dasgupta, A.; Madhavi, Y. V.; Chopra, S.; Nanduri, S.; RSC Adv. 2020, 10, 43533. [Crossref]
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Other methods for the synthesis of 2-amino-quinazolines (49 and 51) have been reported. For instance, Qin et al.5151 Qin, Z.-Y.; Sun, C.-X.; Zhang, W.-W.; Li, J.-R.; Gong, Y.-X.; Shu, W.-M.; Wu, A.-X.; Catalysts 2023, 13, 1447. [Crossref]
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reported a [4 + 2] annulation reaction between 2-aminoaryl ketones (47) and N-benzyl cyanamides (48), using catalytic HCl and 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) as a solvent to provide 49.5151 Qin, Z.-Y.; Sun, C.-X.; Zhang, W.-W.; Li, J.-R.; Gong, Y.-X.; Shu, W.-M.; Wu, A.-X.; Catalysts 2023, 13, 1447. [Crossref]
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In another example, Pandya et al.5252 Pandya, A. N.; Villa, E. M.; North, E. J.; Tetrahedron Lett. 2017, 58, 1276. [Crossref]
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reported a metal-free oxidative annulation strategy for the facile and efficient preparation of 2-aminoquinazolines (51) from 2-aminobenzophenones (50) and cyanamide derivatives in DMF.5252 Pandya, A. N.; Villa, E. M.; North, E. J.; Tetrahedron Lett. 2017, 58, 1276. [Crossref]
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For the preparation of 4-aminoquinazolines, it was also reported5353 Malasala, S.; Gour, J.; Ahmad, Md. N.; Gatadi, S.; Shukla, M.; Kaul, G.; Dasgupta, A.; Madhavi, Y. V.; Chopra, S.; Nanduri, S.; RSC Adv. 2020, 10, 43533. [Crossref]
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the use of 2-bromobenzoic acid (52) for a one-pot condensation reaction via in situ amine generation using ammonia. This copper-mediated oxidative coupling with various aldehydes produces 2-aryl/heteroaryl-substituted 4-quinazolones (53), which could be further explored for the synthesis of bioactive 4-amino-quinazolines (54).5353 Malasala, S.; Gour, J.; Ahmad, Md. N.; Gatadi, S.; Shukla, M.; Kaul, G.; Dasgupta, A.; Madhavi, Y. V.; Chopra, S.; Nanduri, S.; RSC Adv. 2020, 10, 43533. [Crossref]
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Other methods leading to quinazolinones intermediates have also been reported,5454 Xu, W.; Jin, Y.; Liu, H.; Jiang, Y.; Fu, H.; Org. Lett. 2011, 13, 1274. [Crossref]
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such as copper-catalyzed domino synthesis via Ullmann-type coupling and aerobic oxidative C-H amidation.

Elkamhawy et al.5555 Elkamhawy, A.; Lee, J.; Park, B.-G.; Park, I.; Pae, A. N.; Roh, E. J.; Eur. J. Med. Chem. 2014, 84, 466. [Crossref]
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reported the use of 2,4-dinitrophenol (55) as a starting material to obtain 6-oxo-7-amino-quinazolines (58) through functionalization of the phenol group, hydrogenation of the nitro groups, and subsequent conversion into carbamates (56) (Scheme 5). Cyclization of 56 employing hexamethylenetetramine (HMTA) furnished 7-amino-quinazolines (57), which were further modified to yield bioactive amino-quinazolines (58).5555 Elkamhawy, A.; Lee, J.; Park, B.-G.; Park, I.; Pae, A. N.; Roh, E. J.; Eur. J. Med. Chem. 2014, 84, 466. [Crossref]
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Zhou et al.5656 Zhou, G.; Aslanian, R.; Gallo, G.; Khan, T.; Kuang, R.; Purakkattle, B.; De Ruiz, M.; Stamford, A.; Ting, P.; Wu, H.; Wang, H.; Xiao, D.; Yu, T.; Zhang, Y.; Mullins, D.; Hodgson, R.; Bioorg. Med. Chem. Lett. 2016, 26, 1348. [Crossref]
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reported the synthesis of 2-amino-4-carboxamidoquinazolines (61) from isatin (59). To synthesize this class of compounds, the authors hydrolyzed the isatin amide group, followed by cyclization with guanidine, producing 2-aminoquinazoline 4-carboxylic acid 60, which was then functionalized to afford the bioactive amino-quinazolines (61) (Scheme 5).5656 Zhou, G.; Aslanian, R.; Gallo, G.; Khan, T.; Kuang, R.; Purakkattle, B.; De Ruiz, M.; Stamford, A.; Ting, P.; Wu, H.; Wang, H.; Xiao, D.; Yu, T.; Zhang, Y.; Mullins, D.; Hodgson, R.; Bioorg. Med. Chem. Lett. 2016, 26, 1348. [Crossref]
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Bidou et al.5757 Bidou, L.; Bugaud, O.; Merer, G.; Coupet, M.; Hatin, I.; Chirkin, E.; Karri, S.; Demais, S.; François, P.; Cintrat, J.-C.; Namy, O.; Proc. Natl. Acad. Sci. U. S. A. 2022, 119, e2122004119. [Crossref]
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reported the synthesis of 2-guanidino-quinazoline (64) starting from aniline (62). The process involved converting aniline (62) to 2,2,4-trimethyl-1,2-dihydroquinoline (63) using indium (III) chloride, and acetone. This was followed by a reaction with dicyandiamide to yield 64 (Scheme 5).5757 Bidou, L.; Bugaud, O.; Merer, G.; Coupet, M.; Hatin, I.; Chirkin, E.; Karri, S.; Demais, S.; François, P.; Cintrat, J.-C.; Namy, O.; Proc. Natl. Acad. Sci. U. S. A. 2022, 119, e2122004119. [Crossref]
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Scheme 5
(i) Benzylbromides, K2CO3, KI;5555 Elkamhawy, A.; Lee, J.; Park, B.-G.; Park, I.; Pae, A. N.; Roh, E. J.; Eur. J. Med. Chem. 2014, 84, 466. [Crossref]
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(ii) H2, 10% Pt/C;5555 Elkamhawy, A.; Lee, J.; Park, B.-G.; Park, I.; Pae, A. N.; Roh, E. J.; Eur. J. Med. Chem. 2014, 84, 466. [Crossref]
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(iii) ethyl chloroformate, TEA;5555 Elkamhawy, A.; Lee, J.; Park, B.-G.; Park, I.; Pae, A. N.; Roh, E. J.; Eur. J. Med. Chem. 2014, 84, 466. [Crossref]
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(iv) HMTA, TFA;5555 Elkamhawy, A.; Lee, J.; Park, B.-G.; Park, I.; Pae, A. N.; Roh, E. J.; Eur. J. Med. Chem. 2014, 84, 466. [Crossref]
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(v) K2CO3, H2O/CH3CN;5656 Zhou, G.; Aslanian, R.; Gallo, G.; Khan, T.; Kuang, R.; Purakkattle, B.; De Ruiz, M.; Stamford, A.; Ting, P.; Wu, H.; Wang, H.; Xiao, D.; Yu, T.; Zhang, Y.; Mullins, D.; Hodgson, R.; Bioorg. Med. Chem. Lett. 2016, 26, 1348. [Crossref]
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(vi) guanidine, NaOEt, Δ;5656 Zhou, G.; Aslanian, R.; Gallo, G.; Khan, T.; Kuang, R.; Purakkattle, B.; De Ruiz, M.; Stamford, A.; Ting, P.; Wu, H.; Wang, H.; Xiao, D.; Yu, T.; Zhang, Y.; Mullins, D.; Hodgson, R.; Bioorg. Med. Chem. Lett. 2016, 26, 1348. [Crossref]
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(vii) amine, HATU, DIPEA;5656 Zhou, G.; Aslanian, R.; Gallo, G.; Khan, T.; Kuang, R.; Purakkattle, B.; De Ruiz, M.; Stamford, A.; Ting, P.; Wu, H.; Wang, H.; Xiao, D.; Yu, T.; Zhang, Y.; Mullins, D.; Hodgson, R.; Bioorg. Med. Chem. Lett. 2016, 26, 1348. [Crossref]
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(viii) InCl3 (5 mol%), acetone;5757 Bidou, L.; Bugaud, O.; Merer, G.; Coupet, M.; Hatin, I.; Chirkin, E.; Karri, S.; Demais, S.; François, P.; Cintrat, J.-C.; Namy, O.; Proc. Natl. Acad. Sci. U. S. A. 2022, 119, e2122004119. [Crossref]
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(ix) 1 M HCl in diethyl ether, acetonitrile;5757 Bidou, L.; Bugaud, O.; Merer, G.; Coupet, M.; Hatin, I.; Chirkin, E.; Karri, S.; Demais, S.; François, P.; Cintrat, J.-C.; Namy, O.; Proc. Natl. Acad. Sci. U. S. A. 2022, 119, e2122004119. [Crossref]
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(x) dicyandiamide, Δ;5757 Bidou, L.; Bugaud, O.; Merer, G.; Coupet, M.; Hatin, I.; Chirkin, E.; Karri, S.; Demais, S.; François, P.; Cintrat, J.-C.; Namy, O.; Proc. Natl. Acad. Sci. U. S. A. 2022, 119, e2122004119. [Crossref]
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(xi) (1) mCPBA, (2) 390 nm UV light, (3) NH4H2NCO2, O3.5858 Woo, J.; Stein, C.; Christian, A. H.; Levin, M. D.; Nature 2023, 623, 77. [Crossref]
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Recently, innovative synthetic methods have been published for synthesizing amino-quinazolines. For instance, Woo et al.5858 Woo, J.; Stein, C.; Christian, A. H.; Levin, M. D.; Nature 2023, 623, 77. [Crossref]
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reported a method that involves the carbon-to-nitrogen single-atom transmutation of azaarenes. Also known as skeleton editing, this synthetic strategy enables the replacement of an aromatic carbon atom with a nitrogen atom and may have a direct impact on the discovery of potential medicines. In this work,5858 Woo, J.; Stein, C.; Christian, A. H.; Levin, M. D.; Nature 2023, 623, 77. [Crossref]
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the authors were able to synthesize belumosudil (14) by using this transformation to convert quinoline 65 (1.9 g) to the key quinazoline intermediate 66 (1.3 g). With the 66 in hand, the authors completed the synthesis of the amino-quinazoline belumosudil (14) via a two-step C–H amination sequence (Scheme 5). In the process, the N-oxidation of quinoline 67 to its N-oxide (68) precedes the crucial photorearrangement step, under 390 nm UV light, to give the intermediate 69 (Scheme 6). The ozonolysis step, in the presence of pyridine, produces the intermediate 70 in situ, which is then converted to the desired quinazoline (71) in the presence of ammonium carbamate (Scheme 6).5858 Woo, J.; Stein, C.; Christian, A. H.; Levin, M. D.; Nature 2023, 623, 77. [Crossref]
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Scheme 6
Steps for the carbon-to-nitrogen single-atom transmutation of azaarenes based on mechanistic experiments reported by Woo et al.5858 Woo, J.; Stein, C.; Christian, A. H.; Levin, M. D.; Nature 2023, 623, 77. [Crossref]
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4. Amino-Quinazolines as Kinase Inhibitors

As demonstrated by the performed literature survey, a significant increase in the number of publications describing amino-quinazolines for various therapeutic applications was observed over the considered decades. From 1994-2013, most reports focused on the chemical or pharmaceutical properties of alpha 1-adrenoceptor antagonist drugs5959 Ojha, T.; Bakshi, M.; Chakraborti, A. K.; Singh, S.; J. Pharm. Biomed. Anal. 2003, 31, 775. [Crossref]
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and EGFR protein kinase inhibitors.6060 Hou, T.; Zhu, L.; Chen, L.; Xu, X.; J. Chem. Inf. Comput. Sci. 2003, 43, 273. [Crossref]
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Moreover, during the first decade, Matsuno et al.6161 Matsuno, K.; Nakajima, T.; Ichimura, M.; Giese, N. A.; Yu, J.-C.; Lokker, N. A.; Ushiki, J.; Ide, S.; Oda, S.; Nomoto, Y.; J. Med. Chem. 2002, 45, 4513. [Crossref]
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,6262 Matsuno, K.; Ichimura, M.; Nakajima, T.; Tahara, K.; Fujiwara, S.; Kase, H.; Ushiki, J.; Giese, N. A.; Pandey, A.; Scarborough, R. M.; Lokker, N. A.; Yu, J.-C.; Irie, J.; Tsukuda, E.; Ide, S.; Oda, S.; Nomoto, Y. ; J. Med. Chem. 2002, 45, 3057. [Crossref]
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published a collection of 4-amino-quinazoline analogues that were described as potent and selective inhibitors of platelet-derived growth factor receptor (PDGFR) phosphorylation.6161 Matsuno, K.; Nakajima, T.; Ichimura, M.; Giese, N. A.; Yu, J.-C.; Lokker, N. A.; Ushiki, J.; Ide, S.; Oda, S.; Nomoto, Y.; J. Med. Chem. 2002, 45, 4513. [Crossref]
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,6262 Matsuno, K.; Ichimura, M.; Nakajima, T.; Tahara, K.; Fujiwara, S.; Kase, H.; Ushiki, J.; Giese, N. A.; Pandey, A.; Scarborough, R. M.; Lokker, N. A.; Yu, J.-C.; Irie, J.; Tsukuda, E.; Ide, S.; Oda, S.; Nomoto, Y. ; J. Med. Chem. 2002, 45, 3057. [Crossref]
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Platelet-derived growth factors (PDGFs) and their corresponding tyrosine kinase receptors (α and β-PDGFR) are important mediators of tumor growth and invasion by effects on malignant cells and the surrounding microenvironment. They induce angiogenesis, ensuring nutrient and oxygen supplies for tumor growth, and promoting metastasis.6363 Wehler, T. C.; Frerichs, K.; Graf, C.; Drescher, D.; Schimanski, K.; Biesterfeld, S.; Berger, M. R.; Kanzler, S.; Junginger, T.; Galle, P. R.; Moehler, M.; Gockel, I.; Schimanski, C. C.; Oncol. Rep. 2008, 19, 697. [Crossref]
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,6464 Heldin, C.-H.; Cell Commun. Signaling 2013, 11, 97. [Crossref]
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,6565 Cao, Y.; Trends Mol. Med. 2013, 19, 460. [Crossref]
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,6666 Lima, L. M.; Barbosa, M. L. C.; do Amaral, D. N.; Barreiro, E. J. In Proteinkinase Inhibitors; Laufer, S., ed.; Springer: Cham, 2021, p. 155. [Crossref]
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Therefore, inhibiting PDGFR phosphorylation could provide therapeutic benefits in managing malignant proliferative disorders.6262 Matsuno, K.; Ichimura, M.; Nakajima, T.; Tahara, K.; Fujiwara, S.; Kase, H.; Ushiki, J.; Giese, N. A.; Pandey, A.; Scarborough, R. M.; Lokker, N. A.; Yu, J.-C.; Irie, J.; Tsukuda, E.; Ide, S.; Oda, S.; Nomoto, Y. ; J. Med. Chem. 2002, 45, 3057. [Crossref]
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The authors6262 Matsuno, K.; Ichimura, M.; Nakajima, T.; Tahara, K.; Fujiwara, S.; Kase, H.; Ushiki, J.; Giese, N. A.; Pandey, A.; Scarborough, R. M.; Lokker, N. A.; Yu, J.-C.; Irie, J.; Tsukuda, E.; Ide, S.; Oda, S.; Nomoto, Y. ; J. Med. Chem. 2002, 45, 3057. [Crossref]
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initially described the inhibition of β-PDGFR phosphorylation using a whole cell assay. This demonstrated that the prototype KN1022 (72) was a reversible adenosine triphosphate (ATP)-competitive amino-quinazoline β-PDGFR inhibitor with an inhibitory constant (Ki) of 3 nM.6161 Matsuno, K.; Nakajima, T.; Ichimura, M.; Giese, N. A.; Yu, J.-C.; Lokker, N. A.; Ushiki, J.; Ide, S.; Oda, S.; Nomoto, Y.; J. Med. Chem. 2002, 45, 4513. [Crossref]
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Additionally, novel series of urea and thiourea structural analogues were also evaluated. SAR (structure-activity relationship) studies have shown that the inhibitory activity of urea derivatives is increased by bulky hydrophobic substituents at the para-position of the phenyl ring. This has been demonstrated by the highly potent 4-tert-butyl analogue 73, which has a half-maximal inhibitory concentration (IC50) of 30 nM. Structural analogue 74 was a reasonably potent inhibitor, with an IC50 of 530 nM, and had selectivity for PDGFR family of receptor tyrosine kinases (RTKs), including α and β-PDGFR, c-Kit and Flt3. It does not significantly inhibit other relevant kinases and has adequate oral availability, resulting in high plasma concentration after oral administration in rats (Figure 4).6262 Matsuno, K.; Ichimura, M.; Nakajima, T.; Tahara, K.; Fujiwara, S.; Kase, H.; Ushiki, J.; Giese, N. A.; Pandey, A.; Scarborough, R. M.; Lokker, N. A.; Yu, J.-C.; Irie, J.; Tsukuda, E.; Ide, S.; Oda, S.; Nomoto, Y. ; J. Med. Chem. 2002, 45, 3057. [Crossref]
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Figure 4
4-Amino-quinazolines reported as β-PDGFR phosphorylation inhibitors.

To improve the aqueous solubility of prototype KN1022 (72) and its structural analogues 73 and 74, the replacement of the phenyl moiety by a heteroaryl ring was performed. Thiourea 75 and urea 76 structural analogues were found to be potent and orally available β-PDGFR phosphorylation inhibitors with improved aqueous solubility (Figure 4). Moreover, derivative 76 showed selectivity for inhibiting RTKs from the PDGFR family.6161 Matsuno, K.; Nakajima, T.; Ichimura, M.; Giese, N. A.; Yu, J.-C.; Lokker, N. A.; Ushiki, J.; Ide, S.; Oda, S.; Nomoto, Y.; J. Med. Chem. 2002, 45, 4513. [Crossref]
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Amino-quinazolines have also been reported6767 Lapenna, S.; Giordano, A.; Nat. Rev. Drug. Discovery 2009, 8, 547. [Crossref]
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,6868 Vader, G.; Lens, S. M. A.; Biochim. Biophys. Acta, Rev. Cancer 2008, 1786, 60. [Crossref]
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as inhibitors of aurora kinases, which play a pivotal role in the cell cycle, particularly in cell division and the regulation of mitosis. These enzymes, including aurora A, B, and C, are essential for ensuring the precise orchestration of various phases during cell division. However, malfunctioning or overactive kinases can lead to the development and progression of cancer.6767 Lapenna, S.; Giordano, A.; Nat. Rev. Drug. Discovery 2009, 8, 547. [Crossref]
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,6868 Vader, G.; Lens, S. M. A.; Biochim. Biophys. Acta, Rev. Cancer 2008, 1786, 60. [Crossref]
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Pharmaceutical industry research has explored aurora kinases as potential targets for cancer therapy, as inhibiting these kinases could potentially halt the uncontrolled cell division seen in various cancers. Several aurora kinase inhibitors have been developed and tested in clinical trials, demonstrating potential in limiting cancer growth by interfering with mechanisms that drive abnormal cell division. Studies6767 Lapenna, S.; Giordano, A.; Nat. Rev. Drug. Discovery 2009, 8, 547. [Crossref]
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,6868 Vader, G.; Lens, S. M. A.; Biochim. Biophys. Acta, Rev. Cancer 2008, 1786, 60. [Crossref]
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have shown that these inhibitors can be effective in treating various types of cancer. In 2008, it was reported6969 Foote, K. M.; Mortlock, A. A.; Heron, N. M.; Jung, F. H.; Hill, G. B.; Pasquet, G.; Brady, M. C.; Green, S.; Heaton, S. P.; Kearney, S.; Keen, N. J.; Odedra, R.; Wedge, S. R.; Wilkinson, R. W.; Bioorg. Med. Chem. Lett. 2008, 18, 1904. [Crossref]
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a series of pyrazole derivatives that bear the quinazoline core. This led to the identification of 77, an inhibitor of aurora kinase B with Ki < 1 nM.6969 Foote, K. M.; Mortlock, A. A.; Heron, N. M.; Jung, F. H.; Hill, G. B.; Pasquet, G.; Brady, M. C.; Green, S.; Heaton, S. P.; Kearney, S.; Keen, N. J.; Odedra, R.; Wedge, S. R.; Wilkinson, R. W.; Bioorg. Med. Chem. Lett. 2008, 18, 1904. [Crossref]
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Additionally, 77 showed potent inhibition of histone-H3 phosphorylation in SW620 tumor cells with half maximal effective concentration (EC50) < 1 nM. Histone-H3 is a cellular substrate of aurora kinase B useful as a marker of the enzyme inhibition in vivo.7070 Li, M.; Dong, Q.; Zhu, B.; J. Mol. Biol. 2017, 429, 2042. [Crossref]
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,7171 Goto, H.; Yasui, Y.; Nigg, E. A.; Inagaki, M.; Genes Cells 2002, 7, 11. [Crossref]
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Later, Zheng et al.7272 Zheng, M.; Zheng, Y.; Xue, Y.; Liu, Y.; An, L.; Zhang, L.; Ji, M.; Xue, B.; Wu, X.; Gong, X.; Gu, N.; Zhan, X.; Chem. Biol. Drug. Des. 2013, 81, 399. [Crossref]
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reported quinazoline derivatives as aurora kinase inhibitors, leading to the identification of 80, which showed inhibition of aurora kinases A and B in nanomolar range (aurora A IC50 = 77 nM; aurora B IC50 = 145 nM) (Figure 5).7272 Zheng, M.; Zheng, Y.; Xue, Y.; Liu, Y.; An, L.; Zhang, L.; Ji, M.; Xue, B.; Wu, X.; Gong, X.; Gu, N.; Zhan, X.; Chem. Biol. Drug. Des. 2013, 81, 399. [Crossref]
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Compound 80 was designed by molecular hybridization between ZM447439 (78) and the approved small-molecule drug imatinib (79).7373 Ditchfield, C.; Johnson, V. L.; Tighe, A.; Ellston, R.; Haworth, C.; Johnson, T.; Mortlock, A.; Keen, N.; Taylor, S. S.; J. Cell Biol. 2003, 161, 267. [Crossref]
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It was tested for its cytotoxic activity in vitro and showed potency against multiple cancer cell lines in the low micromolar range.

Figure 5
4-Amino-quinazolines (77, 78 and 80) reported as aurora kinase inhibitors. Imatinib (79) was used for the design of 80.

ALK5, also known as transforming growth factor beta receptor I, belongs to the transforming growth factor-beta (TGF-β) signaling pathway and plays a pivotal role in cellular processes such as proliferation, differentiation, and apoptosis.7474 Yingling, J. M.; Blanchard, K. L.; Sawyer, J. S.; Nat. Rev. Drug. Discovery 2004, 3, 1011. [Crossref]
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Dysregulation of the TGF-β pathway, particularly through aberrant ALK5 signaling, has been linked to the pathogenesis of various cancers and fibrotic disorders.7575 Akhurst, R. J.; Cold Spring Harbor Perspect. Biol. 2017, 9, a022301. [Crossref]
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,7676 Lahn, M.; Herbertz, S.; Sawyer, J. S.; Stauber, A. J.; Gueorguieva, I.; Driscoll, K. E.; Estrem, S. T.; Cleverly, A. L.; Desaiah, D.; Guba, S. C.; Benhadji, K. A.; Slapak, C. A.; Drug Des., Dev. Ther. 2015, 4479. [Crossref]
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,7777 de Gouville, A.-C.; Boullay, V.; Krysa, G.; Pilot, J.; Brusq, J.-M.; Loriolle, F.; Gauthier, J.-M.; Papworth, S. A.; Laroze, A.; Gellibert, F.; Huet, S.; Br. J. Pharmacol. 2005, 145, 166. [Crossref]
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In 2009, a series of quinazoline derivatives were described as ALK5 inhibitors.7878 Gellibert, F.; Fouchet, M.-H.; Nguyen, V.-L.; Wang, R.; Krysa, G.; de Gouville, A.-C.; Huet, S.; Dodic, N.; Bioorg. Med. Chem. Lett. 2009, 19, 2277. [Crossref]
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The authors7878 Gellibert, F.; Fouchet, M.-H.; Nguyen, V.-L.; Wang, R.; Krysa, G.; de Gouville, A.-C.; Huet, S.; Dodic, N.; Bioorg. Med. Chem. Lett. 2009, 19, 2277. [Crossref]
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identified compound 81 through a screen of an in-house kinase-focused library. The researchers then carried out SAR exploration through classic bioisosteric replacement in the aromatic ring at position 2 of the quinazoline core and the ring linked to the amino group of position 4, resulting in the prototype 82. It is worth mentioning that compound 82 also had the introduction of a methyl group on the pyridine ring, resulting in a 10-fold increase in potency for ALK5 inhibition and a 27-fold increase in potency in cellular assays. The X-ray crystallography analysis of 82 on the ATP-binding site of ALK5 revealed two key hydrogen bond interactions. One interaction occurred at the hinge region, with the backbone of His83, through the indazole ring. The other interaction involved two hydrogen bonds mediated by a water molecule through the quinazoline and pyridine rings with the Glu45 side chain and Asp151 backbone. In addition, the 6-methyl-2-pyridine ring was key for the improvement of selectivity over p38 kinase. This group effectively interacted with the selectivity pocket of ALK5, and the methyl group occupied a small, mainly hydrophobic, pocket (Figure 6).

Figure 6
(a) Quinazoline derivatives (81-82) described as ALK5 inhibitors; (b) interaction mode of compound 82 with ALK5 (PDB ID: 3GXL). Figure created with PyMol software.7979 Schrödinger; The PyMOL Molecular Graphics System, version 1.5.0.5; Schrödinger, LLC., USA, 2012.

The EGFR is a crucial target in cancer treatment, as highlighted in numerous scientific publications. Citri and Yarden’s8080 Citri, A.; Yarden, Y.; Nat. Rev. Mol. Cell. Biol. 2006, 7, 505. [Crossref]
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seminal study provided comprehensive insights into the diverse mechanisms through which aberrant EGFR signaling contributes to tumorigenesis. Moreover, pivotal clinical trials have demonstrated the efficacy of EGFR-targeted therapies in specific cancer types. The landmark study by Lynch et al.8181 Lynch, T. J.; Bell, D. W.; Sordella, R.; Gurubhagavatula, S.; Okimoto, R. A.; Brannigan, B. W.; Harris, P. L.; Haserlat, S. M.; Supko, J. G.; Haluska, F. G.; Louis, D. N.; Christiani, D. C.; Settleman, J.; Haber, D. A.; N. Engl. J. Med. 2004, 350, 2129. [Crossref]
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revealed the transformative impact of EGFR inhibitors, such as gefitinib (6) and erlotinib (7), on NSCLC harboring EGFR mutations.

Based on approved drugs, such as gefitinib (6) and erlotinib (7), Liu et al.8282 Liu, L. T.; Yuan, T.-T.; Liu, H.-H.; Chen, S.-F.; Wu, Y.-T.; Bioorg. Med. Chem. Lett. 2007, 17, 6373. [Crossref]
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investigated structural modifications on the 4-anilinoquinazoline core (83) at the C6 and C7 positions and C3’ and C4’ positions of the aniline moiety, resulting in the identification of 84 (Figure 7). The potency for EGFR inhibition was dependent on the position, chain length, and hydrophilicity of the substituted alkynyl groups introduced. Compound 84 exhibited an EGFR IC50 = 14 nM, which is similar to gefitinib (6) (EGFR IC50 = 39 nM). The X-ray structure of gefitinib (6) on EGFR (PDB ID: 2ITO)8383 Yun, C.-H.; Boggon, T. J.; Li, Y.; Woo, M. S.; Greulich, H.; Meyerson, M.; Eck, M. J.; Cancer Cell 2007, 11, 217. [Crossref]
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(Figure 7) and docking studies conducted by the authors demonstrate that the quinazoline-privileged structure binds directly to the hinge region. This emphasizes the key role of quinazoline ring as a privileged hinge binder, which paved the way for the development of many kinase inhibitors after gefitinib (6). It is important to note that this privileged structure can also interact differently, as demonstrated by the mode of interaction of 82 in ALK5 (Figure 6). Nevertheless, the key hinge binding ability of the quinazoline ring is highly prevalent among approved kinase inhibitors (Figure 2). In the case of EGFR inhibitors, two hydrogen bond interactions are critical: the N1 acts as a hydrogen bond acceptor and interacts with the backbone of Met793, while the C–H group at position 2 acts as a non-classical weak hydrogen bond donor interacting with the backbone of Gln791.

Figure 7
(a) Structural design of EGFRi 84;8282 Liu, L. T.; Yuan, T.-T.; Liu, H.-H.; Chen, S.-F.; Wu, Y.-T.; Bioorg. Med. Chem. Lett. 2007, 17, 6373. [Crossref]
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(b) interaction mode of gefitinib (6) with EGFR (PDB: 2ITO). Figure created with PyMol software.7979 Schrödinger; The PyMOL Molecular Graphics System, version 1.5.0.5; Schrödinger, LLC., USA, 2012.

The EGFRT790M mutation is relevant in the field of cancer research, particularly in the context of NSCLC and its resistance to EGFR tyrosine kinase inhibitors (TKIs). Sequist et al.8484 Sequist, L. V.; Martins, R. G.; Spigel, D.; Grunberg, S. M.; Spira, A.; Jänne, P. A.; Joshi, V. A.; McCollum, D.; Evans, T. L.; Muzikansky, A.; Kuhlmann, G. L.; Han, M.; Goldberg, J. S.; Settleman, J.; Iafrate, A. J.; Engelman, J. A.; Haber, D. A.; Johnson, B. E.; Lynch, T. J.; J. Clin. Oncol. 2008, 26, 2442. [Crossref]
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were among the pioneers in elucidating the clinical relevance of the T790M mutation. Their work demonstrated that this secondary mutation in the EGFR gene is a common mechanism of acquired resistance to first-generation EGFR TKIs, such as gefitinib (6) and erlotinib (7).

The enlarged side chain of the mutated methionine residue creates steric hindrance, which prevents the binding of reversible inhibitors. Furthermore, this alteration is related to an increased affinity of ATP to the binding site, and disrupts the formation of a critical water-mediated hydrogen bond between the inhibitor and T790 of wildtype EGFR.8585 Yun, C.-H.; Mengwasser, K. E.; Toms, A. V.; Woo, M. S.; Greulich, H.; Wong, K.-K.; Meyerson, M.; Eck, M. J.; Proc. Natl. Acad. Sci. U. S. A. 2008, 105, 2070. [Crossref]
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These observations resulted in the search for inhibitors of mutated EGFRT790M.8686 Zhou, W.; Ercan, D.; Chen, L.; Yun, C.-H.; Li, D.; Capelletti, M.; Cortot, A. B.; Chirieac, L.; Iacob, R. E.; Padera, R.; Engen, J. R.; Wong, K.-K.; Eck, M. J.; Gray, N. S.; Jänne, P. A.; Nature 2009, 462, 1070. [Crossref]
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For example, Michalczyk et al.8787 Michalczyk, A.; Klüter, S.; Rode, H. B.; Simard, J. R.; Grütter, C.; Rabiller, M.; Rauh, D.; Bioorg. Med. Chem. 2008, 16, 3482. [Crossref]
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designed irreversible 4-(phenylamino) quinazoline-based EGFR inhibitors by attaching Michael acceptor groups at the sidechain of position 6 of the quinazoline core, leading to the identification of 85. The electrophilic Michael acceptor groups introduced can react with nucleophilic Cys797 in the ATP binding site of EGFR. This acrylamide derivative (85) presented a single-digit nanomolar potency for EGFRT790M inhibition (IC50 = 1.2 nM) and potency in the picomolar range for wild-type EGFR inhibition (IC50 = 0.08 nM). The X-ray crystallographic analysis of the drug afatinib (11) in EGFRT790M confirms the covalent bond at Cys797 through the acrylamide moiety (Figure 8),8888 Solca, F.; Dahl, G.; Zoephel, A.; Bader, G.; Sanderson, M.; Klein, C.; Kraemer, O.; Himmelsbach, F.; Haaksma, E.; Adolf, G. R.; J. Pharmacol. Exp. Ther. 2012, 343, 342. [Crossref]
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which is similar to data described for 85.8989 Blair, J. A.; Rauh, D.; Kung, C.; Yun, C.-H.; Fan, Q.-W.; Rode, H.; Zhang, C.; Eck, M. J.; Weiss, W. A.; Shokat, K. M.; Nat. Chem. Biol. 2007, 3, 229. [Crossref]
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Subsequent studies, such as the one published by Carmi et al.,9090 Carmi, C.; Cavazzoni, A.; Vezzosi, S.; Bordi, F.; Vacondio, F.; Silva, C.; Rivara, S.; Lodola, A.; Alfieri, R. R.; La Monica, S.; Galetti, M.; Ardizzoni, A.; Petronini, P. G.; Mor, M.; J. Med. Chem. 2010, 53, 2038. [Crossref]
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conducted more in-depth SAR of the electrophilic warheads in position 6 of the quinazoline ring of 36, explored to covalently inhibit EGFR. This included exploring nucleophilic substitution (epoxides); nucleophilic substitution with in situ release of a leaving group (phenoxymethylamides); carbamoylation (carbamate); Pinner reaction with formation of a thioimidate adduct (nitrile) and disulfide bond formation (isothiazolinone, benzisothiazolinone and thiadiazole).9090 Carmi, C.; Cavazzoni, A.; Vezzosi, S.; Bordi, F.; Vacondio, F.; Silva, C.; Rivara, S.; Lodola, A.; Alfieri, R. R.; La Monica, S.; Galetti, M.; Ardizzoni, A.; Petronini, P. G.; Mor, M.; J. Med. Chem. 2010, 53, 2038. [Crossref]
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After evaluating the binding to EGFRWT and confirming irreversible inhibition in a cell-based assay, the epoxide derivative 87 was identified. Compound 87 showed low micromolar potency in inhibiting the H1975 gefitinib-resistant cell line that harbors the EGFRT790M mutation, and it was approximately 5-fold more potent than gefitinib (6).

Figure 8
(a) Covalent EGFRi afatinib (11), 85 and 87;8787 Michalczyk, A.; Klüter, S.; Rode, H. B.; Simard, J. R.; Grütter, C.; Rabiller, M.; Rauh, D.; Bioorg. Med. Chem. 2008, 16, 3482. [Crossref]
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,8888 Solca, F.; Dahl, G.; Zoephel, A.; Bader, G.; Sanderson, M.; Klein, C.; Kraemer, O.; Himmelsbach, F.; Haaksma, E.; Adolf, G. R.; J. Pharmacol. Exp. Ther. 2012, 343, 342. [Crossref]
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,8989 Blair, J. A.; Rauh, D.; Kung, C.; Yun, C.-H.; Fan, Q.-W.; Rode, H.; Zhang, C.; Eck, M. J.; Weiss, W. A.; Shokat, K. M.; Nat. Chem. Biol. 2007, 3, 229. [Crossref]
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,9090 Carmi, C.; Cavazzoni, A.; Vezzosi, S.; Bordi, F.; Vacondio, F.; Silva, C.; Rivara, S.; Lodola, A.; Alfieri, R. R.; La Monica, S.; Galetti, M.; Ardizzoni, A.; Petronini, P. G.; Mor, M.; J. Med. Chem. 2010, 53, 2038. [Crossref]
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(b) interaction mode of afatinib (11) with EGFRT790M (PDB ID: 4G5P). Figure created with PyMol software.7979 Schrödinger; The PyMOL Molecular Graphics System, version 1.5.0.5; Schrödinger, LLC., USA, 2012.

Over the past decade, numerous studies have been reported on effectiveness of amino-quinazolines as kinase inhibitors for treating cancer and inflammatory diseases, continuing a trend from the previous two decades. For instance, Shao et al.2727 Shao, J.; Chen, E.; Shu, K.; Chen, W.; Zhang, G.; Yu, Y.; Bioorg. Med. Chem. 2016, 24, 3359. [Crossref]
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reported 6-oxooxazolidine-quinazolines as noncovalent inhibitors targeting mutant forms of EGFR related to resistance. Compound 88 (Figure 9) was the best in the series with EGFRL858R IC50 = 3.1 nM, and EGFRT790M IC50 = 26.3 nM.2727 Shao, J.; Chen, E.; Shu, K.; Chen, W.; Zhang, G.; Yu, Y.; Bioorg. Med. Chem. 2016, 24, 3359. [Crossref]
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In addition to targeting mutant forms of EGFR, efforts have also been made to develop dual kinase inhibitors, as blocking multiple pathways simultaneously may be more effective in preventing cancer cell survival and growth. One strategy to potentially overcome the resistance observed with EGFR TKIs is to target both EGFR and receptor tyrosine-protein kinase erbB-2 (HER2).9191 Passaro, A.; Jänne, P. A.; Mok, T.; Peters, S.; Nat. Cancer 2021, 2, 377. [Crossref]
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In this sense, Jiao et al.9292 Jiao, X.; Zhang, Q.; Zhang, Y.; Shao, J.; Ding, L.; Tang, C.; Feng, B.; Bioorg. Med. Chem. Lett. 2022, 67, 128703. [Crossref]
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reported quinazoline derivatives as EGFR/HER2 dual target inhibitors, by harnessing the classical 4-anilino-quinazoline subunit while incorporating a series of acrylamides in the 6-position of the quinazoline ring connected to piperazine spacers. This resulted in compound 89 (Figure 9) with EGFR IC50 = 0.30 nM, and HER2 IC50 = 6.07 nM.9292 Jiao, X.; Zhang, Q.; Zhang, Y.; Shao, J.; Ding, L.; Tang, C.; Feng, B.; Bioorg. Med. Chem. Lett. 2022, 67, 128703. [Crossref]
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In 2019, Das et al.4242 Das, D.; Xie, L.; Wang, J.; Xu, X.; Zhang, Z.; Shi, J.; Le, X.; Hong, J.; Bioorg. Med. Chem. Lett. 2019, 29, 591. [Crossref]
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reported the discovery of new quinazoline derivatives as dual EGFR/HER2 inhibitors and their anticancer activities. Compound 90 (Figure 9), which had an acrylamide directly connected to the 6-position of the quinazoline ring, presented the best profile with EGFR IC50 = 1.4 nM, and HER2 IC50 = 10.9 nM.4242 Das, D.; Xie, L.; Wang, J.; Xu, X.; Zhang, Z.; Shi, J.; Le, X.; Hong, J.; Bioorg. Med. Chem. Lett. 2019, 29, 591. [Crossref]
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Sun et al.9393 Sun, M.; Jia, J.; Sun, H.; Wang, F.; Bioorg. Med. Chem. Lett. 2020, 30, 127045. [Crossref]
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reported the synthesis of a group of dual inhibitors targeting EGFR/HER2, which feature a scaffold comprising tricyclic oxazine-fused quinazolines. The best compound of the series (91), also featuring an acrylamide in its structure, had an EGFR IC50 = 7 nM, and a HER2 IC50 = 4 nM (Figure 9).9393 Sun, M.; Jia, J.; Sun, H.; Wang, F.; Bioorg. Med. Chem. Lett. 2020, 30, 127045. [Crossref]
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Figure 9
EGFR inhibitor (88) and dual EGFR kinase inhibitors (89-93) having amino-quinazoline structure.

EGFR signaling also activates vascular endothelial growth factor (VEGF), which is the primary initiator of angiogenesis. VEGF stimulates the activation, growth, and movement of endothelial cells, as well as enhances vascular permeability in solid tumors. The critical phase of the mechanism is facilitated by the receptor known as vascular endothelial growth factor receptor 2 (VEGFR-2).9494 Garofalo, A.; Farce, A.; Ravez, S.; Lemoine, A.; Six, P.; Chavatte, P.; Goossens, L.; Depreux, P.; J. Med. Chem. 2012, 55, 1189. [Crossref]
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,9595 Arora, A.; Scholar, E. M.; J. Pharmacol. Exp. Ther. 2005, 315, 971. [Crossref]
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Therefore, inhibiting both EGFR and VEGFR-2 concurrently emerges as a strategy for cancer therapy, given that inhibiting VEGFR-2 enhances the effectiveness of EGFR TKIs through a synergistic effect. In this context, Barbosa et al.99 Barbosa, M. L. C.; Lima, L. M.; Tesch, R.; Sant’Anna, C. M. R.; Totzke, F.; Kubbutat, M. H. G.; Schächtele, C.; Laufer, S. A.; Barreiro, E. J.; Eur. J. Med. Chem. 2014, 71, 1. [Crossref]
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reported 2-chloro-4-anilino-quinazoline derivatives as EGFR and VEGFR-2 dual inhibitors. The representative compound LASSBio-1819 (92) (Figure 9) had an EGFRWT IC50 = 0.90 μM, and a VEGFR-2 IC50 = 1.17 μM.99 Barbosa, M. L. C.; Lima, L. M.; Tesch, R.; Sant’Anna, C. M. R.; Totzke, F.; Kubbutat, M. H. G.; Schächtele, C.; Laufer, S. A.; Barreiro, E. J.; Eur. J. Med. Chem. 2014, 71, 1. [Crossref]
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In certain types of human cancers, the collaboration between phosphatidylinositol 3-kinases (PI3Ks) and EGFR is evident in promoting processes such as proliferation, survival, invasion, and metastasis. This correlation arises from the integration of the PI3K/Akt/mTOR pathways as a significant component of EGFR signaling.9696 Yarden, Y.; Sliwkowski, M. X.; Nat. Rev. Mol. Cell. Biol. 2001, 2, 127. [Crossref]
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As a result, the development of dual-target molecules for both EGFR and PI3K may confer therapeutic benefits and represents an interesting strategy for designing anticancer drugs. Ding et al.9797 Ding, H.-W.; Deng, C.-L.; Li, D.-D.; Liu, D.-D.; Chai, S.-M.; Wang, W.; Zhang, Y.; Chen, K.; Li, X.; Wang, J.; Song, S.-J.; Song, H.-R.; Eur. J. Med. Chem. 2018, 146, 460. [Crossref]
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developed EGFR inhibitors using the 4-anilino-quinazoline scaffold and a 6-sulfonamide-substituted pyridyl group to enhance affinity to PI3Ks. Compound 93 (Figure 9), for instance, had an EGFR IC50 of 2.4 nM and a PI3Kα IC50 of 317 nM.9797 Ding, H.-W.; Deng, C.-L.; Li, D.-D.; Liu, D.-D.; Chai, S.-M.; Wang, W.; Zhang, Y.; Chen, K.; Li, X.; Wang, J.; Song, S.-J.; Song, H.-R.; Eur. J. Med. Chem. 2018, 146, 460. [Crossref]
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In addition to amino-quinazolines as EGFRi, various compounds of this class targeting other kinases have been described. One example is the 2-(2-aminopyrimidin-5-yl)-4-morpholino-N -(pyridin-3-yl)quinazolin-7-amines PI3K/mTOR inhibitors reported by Peng et al.2525 Peng, W.; Tu, Z.-C.; Long, Z.-J.; Liu, Q.; Lu, G.; Eur. J. Med. Chem. 2016, 108, 644. [Crossref]
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The class I PI3K family comprises α, β, γ, and δ isoforms, with PI3Kα and PI3Kβ being widely distributed and PI3Kγ and PI3Kδ exhibiting more limited expression, primarily in leukocytes. Several pieces of evidence suggest that different isoforms of class I PI3K play distinct roles in tumorigenesis.9898 Liu, P.; Cheng, H.; Roberts, T. M.; Zhao, J. J.; Nat. Rev. Drug. Discovery 2009, 8, 627. [Crossref]
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Upon PI3K activation, Akt and mTOR play crucial roles in regulating cell growth, survival, and proliferation by integrating various signals, including those from growth factors, nutrient availability, and cellular energy levels.9999 Wullschleger, S.; Loewith, R.; Hall, M. N.; Cell 2006, 124, 471. [Crossref]
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These findings suggest that inhibitors targeting PI3K and mTOR could be beneficial in cancer therapeutics.100100 Ihle, N. T.; Powis, G.; Mol. Cancer Ther. 2009, 8, 1. [Crossref]
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In this context, Peng et al.2525 Peng, W.; Tu, Z.-C.; Long, Z.-J.; Liu, Q.; Lu, G.; Eur. J. Med. Chem. 2016, 108, 644. [Crossref]
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disclosed that compound 94 (Figure 10) was the most effective, with PI3Kα IC50 = 4.2 nM, PI3Kβ IC50 = 13 nM, PI3Kγ IC50 = 64 nM, PI3Kδ IC50 = 50 nM, and mTOR IC50 = 78 nM. Hei et al.101101 Hei, Y.-Y.; Zhang, S.-Q.; Feng, Y.; Wang, J.; Duan, W.; Zhang, H.; Mao, S.; Sun, H.; Xin, M.; Bioorg. Med. Chem. 2019, 27, 114930. [Crossref]
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reported quinazoline derivatives with an alkylsulfonamide moiety, serving as inhibitors for PI3Ks. The most effective compound (95) (Figure 10) exhibited robust inhibitory activity against PI3Kα (IC50 = 4.5 nM), PI3Kβ (IC50 = 15.5 nM), PI3Kγ (IC50 = 6.0 nM), and PI3Kδ (IC50 = 2.2 nM).101101 Hei, Y.-Y.; Zhang, S.-Q.; Feng, Y.; Wang, J.; Duan, W.; Zhang, H.; Mao, S.; Sun, H.; Xin, M.; Bioorg. Med. Chem. 2019, 27, 114930. [Crossref]
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In 2020, Teng et al.2828 Teng, Y.; Li, X.; Ren, S.; Cheng, Y.; Xi, K.; Shen, H.; Ma, W.; Luo, G.; Xiang, H.; Eur. J. Med. Chem. 2020, 208, 112865. [Crossref]
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published new quinazoline derivatives functioning as inhibitors of PI3Kδ. Notably, compound 96 (Figure 10) demonstrated an IC50 value of 27.5 nM against PI3Kδ.2828 Teng, Y.; Li, X.; Ren, S.; Cheng, Y.; Xi, K.; Shen, H.; Ma, W.; Luo, G.; Xiang, H.; Eur. J. Med. Chem. 2020, 208, 112865. [Crossref]
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PI3Kδ is predominantly expressed in hematopoietic cells and plays a critical role in B-cell malignancies through the PI3K/Akt signaling pathway. Therefore, targeting PI3Kδ specifically has emerged as a promising strategy for treating B-cell malignancies, aiming to avoid potential side effects associated with the ubiquitously expressed PI3Kα, β, and γ isoform.102102 Chantry, D.; Vojtek, A.; Kashishian, A.; Holtzman, D. A.; Wood, C.; Gray, P. W.; Cooper, J. A.; Hoekstra, M. F.; J. Biol. Chem. 1997, 272, 19236. [Crossref]
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,103103 Puri, K. D.; Gold, M. R.; Front. Immunol. 2012, 3, 256. [Crossref]
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Figure 10
Chemical structures of amino-quinazolines (94-101) targeting clinically relevant kinases.

Compounds that target other kinases include the 5-anilinoquinazoline-8-nitro VEGFR-2 inhibitor (97) (Figure 10), which has a VEGFR-2 IC50 of 64 nM, as reported by Zhao et al.104104 Zhao, Y.; Liu, F.; He, G.; Li, K.; Zhu, C.; Yu, W.; Zhang, C.; Xie, M.; Lin, J.; Zhang, J.; Jin, Y.; Bioorg. Med. Chem. Lett. 2019, 29, 126711. [Crossref]
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VEGFR-2 is an interesting target due to its expression in endothelial cells and elevated levels in various tumor cells. Multiple lines of evidence indicate that the overactivation of VEGFR-2 is associated with metastasis in a majority of patients with solid tumors.105105 Roskoski, R.; Crit. Rev. Oncol. Hematol. 2007, 62, 179. [Crossref]
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Hao et al.2626 Hao, C.; Zhao, F.; Song, H.; Guo, J.; Li, X.; Jiang, X.; Huan, R.; Song, S.; Zhang, Q.; Wang, R.; Wang, K.; Pang, Y.; Liu, T.; Lu, T.; Huang, W.; Wang, J.; Lin, B.; He, Z.; Li, H.; Li, F.; Zhao, D.; Cheng, M.; J. Med. Chem. 2018, 61, 265. [Crossref]
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reported 6-chloro-4-aminoquinazoline-2-carboxamide derivatives as potent inhibitors of p21-activated kinase 4 (PAK4). PAKs are serine/threonine protein kinases that function as downstream signaling effectors of rho-family guanosine triphosphate hydrolases (GTPases). Numerous malignancies in humans have been related to the overexpression, amplification, and mutational activation of PAKs.106106 Radu, M.; Semenova, G.; Kosoff, R.; Chernoff, J.; Nat. Rev. Cancer 2014, 14, 13. [Crossref]
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As a result, PAKs have become promising targets for novel anticancer treatments and have been the focus of intensive drug development initiatives.107107 Senapedis, W.; Crochiere, M.; Baloglu, E.; Landesman, Y.; Anti-Cancer Agents Med. Chem. 2016, 16, 75. [Crossref]
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PAK4, the most researched member of group II PAK enzymes, has garnered significant attention due to its involvement in the invasion, metastasis, and spread of malignancies driven by Kirsten rat sarcoma virus (KRAS) or rapidly accelerated fibrosarcoma oncogene homolog B (BRAF).108108 Minden, A.; ISRN Oncol. 2012, 694201. [Crossref]
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Hao et al.2626 Hao, C.; Zhao, F.; Song, H.; Guo, J.; Li, X.; Jiang, X.; Huan, R.; Song, S.; Zhang, Q.; Wang, R.; Wang, K.; Pang, Y.; Liu, T.; Lu, T.; Huang, W.; Wang, J.; Lin, B.; He, Z.; Li, H.; Li, F.; Zhao, D.; Cheng, M.; J. Med. Chem. 2018, 61, 265. [Crossref]
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reported that compound 98 (Figure 10) had PAK4 Ki = 9 nM, and showed selectivity over 54 kinases, including over PAK1 (346-fold).

Shi et al.4949 Shi, H.; Tang, H.; Li, Y.; Chen, D.; Liu, T.; Chen, Y.; Wang, X.; Chen, L.; Wang, Y.; Xie, H.; Xiong, B.; Eur. J. Med. Chem. 2023, 248, 115064. [Crossref]
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reported an extensive series of quinazoline-2,5-diamine derivatives as potent inhibitors of hematopoietic progenitor kinase 1 (HPK1). HPK1 negatively regulates multiple immunological signaling pathways through serine/threonine kinase activity. Genetic research suggests that inhibiting the HPK1 kinase could be a promising strategy for cancer immunotherapy.109109 Sawasdikosol, S.; Burakoff, S.; eLife 2020, 9, e55122. [Crossref]
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In this context, the amino-quinazoline 99 (Figure 10) has demonstrated potent HPK1 kinase inhibition with an IC50 = 2.7 nM, making it a potential candidate for further studies.4949 Shi, H.; Tang, H.; Li, Y.; Chen, D.; Liu, T.; Chen, Y.; Wang, X.; Chen, L.; Wang, Y.; Xie, H.; Xiong, B.; Eur. J. Med. Chem. 2023, 248, 115064. [Crossref]
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JAK1, JAK2, JAK3, and TYK2 are members of the Janus tyrosine kinase (JAK) family, which are essential for cytokine receptor signaling related to severe asthma development. Therefore, the development of JAK inhibitors is of great interest.110110 Georas, S. N.; Donohue, P.; Connolly, M.; Wechsler, M. E.; J. Allergy Clin. Immunol. 2021, 148, 953. [Crossref]
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In this regard, Wellaway et al.5050 Wellaway, C. R.; Baldwin, I. R.; Bamborough, P.; Barker, D.; Bartholomew, M. A.; Chung, C.; Dümpelfeld, B.; Evans, J. P.; Fazakerley, N. J.; Homes, P.; Keeling, S. P.; Lewell, X. Q.; McNab, F. W.; Morley, J.; Needham, D.; Neu, M.; van Oosterhout, A. J. M.; Pal, A.; Reinhard, F. B. M.; Rianjongdee, F.; Robertson, C. M.; Rowland, P.; Shah, R. R.; Sherriff, E. B.; Sloan, L. A.; Teague, S.; Thomas, D. A.; Wellaway, N.; Wojno-Picon, J.; Woolven, J. M.; Coe, D. M.; J. Med. Chem. 2022, 65, 633. [Crossref]
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reported the identification of 2,8-diamino-quinazolines as JAK inhibitors. Compound 100 was identified as the most promising candidate for asthma treatment due to its favorable profile for lung delivery and potent inhibition of JAK1, JAK2, and JAK3 with negative logarithm of IC50 (pIC50) values of 9.2, 9.3, and 9.3, respectively. This favorable profile was attributed to a specific substituent at the quinazoline 2-position, which prevented aldehyde oxidase metabolism.5050 Wellaway, C. R.; Baldwin, I. R.; Bamborough, P.; Barker, D.; Bartholomew, M. A.; Chung, C.; Dümpelfeld, B.; Evans, J. P.; Fazakerley, N. J.; Homes, P.; Keeling, S. P.; Lewell, X. Q.; McNab, F. W.; Morley, J.; Needham, D.; Neu, M.; van Oosterhout, A. J. M.; Pal, A.; Reinhard, F. B. M.; Rianjongdee, F.; Robertson, C. M.; Rowland, P.; Shah, R. R.; Sherriff, E. B.; Sloan, L. A.; Teague, S.; Thomas, D. A.; Wellaway, N.; Wojno-Picon, J.; Woolven, J. M.; Coe, D. M.; J. Med. Chem. 2022, 65, 633. [Crossref]
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The interleukin-1 receptor associated kinase 4 (IRAK4) is another kinase associated with inflammation, which is linked to TLR- and IL-1R-based signaling pathways. Consequently, a potential therapy for inflammatory diseases involves selectively inhibiting this kinase. This is reinforced by the fact that pharmacological inhibition of IRAK4 can have a good clinical safety profile.111111 Li, X.; Eur. J. Immunol. 2008, 38, 614. [Crossref]
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In this scenario, amino-quinazolines have also been explored for the development of IRAK4 inhibitors, such as compound 101, reported by Smith et al.112112 Smith, G. F.; Altman, M. D.; Andresen, B.; Baker, J.; Brubaker, J. D.; Chen, H.; Chen, Y.; Childers, M.; Donofrio, A.; Ferguson, H.; Fischer, C.; Fischmann, T. O.; Gibeau, C.; Hicks, A.; Jin, S.; Kattar, S.; Kleinschek, M. A.; Leccese, E.; Lesburg, C.; Li, C.; Lim, J.; Liu, D.; Maclean, J. K. F.; Mansoor, F.; Moy, L. Y.; Mulrooney, E. F.; Necheva, A. S.; Presland, J.; Rakhilina, L.; Yang, R.; Torres, L.; Zhang-Hoover, J.; Northrup, A.; Bioorg. Med. Chem. Lett. 2017, 27, 2721. [Crossref]
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with IRAK4 IC50 = 7 nM.

In addition to amino-quinazolines being described as kinase inhibitors, a variety of novel biological activities have been reported, including modulation of new targets for the treatment of cancer, neurodegenerative and infectious diseases. Therefore, the following sections are divided according to these therapeutic areas.

5. Anticancer Amino-Quinazolines Targeting KRAS, ABC Transporters or Active in Phenotypic Assays

The most common reason for chemotherapy failure is the emergence of multidrug resistance (MDR), in which cancer cells become resistant to chemotherapeutic drugs that are structurally unrelated. AT P synthase-binding cassette (ABC) transport proteins play a crucial role in the development of MDR. These ABC family members use the energy of ATP hydrolysis to transport a wide range of structurally unrelated molecules out of cells against a concentration gradient.112112 Smith, G. F.; Altman, M. D.; Andresen, B.; Baker, J.; Brubaker, J. D.; Chen, H.; Chen, Y.; Childers, M.; Donofrio, A.; Ferguson, H.; Fischer, C.; Fischmann, T. O.; Gibeau, C.; Hicks, A.; Jin, S.; Kattar, S.; Kleinschek, M. A.; Leccese, E.; Lesburg, C.; Li, C.; Lim, J.; Liu, D.; Maclean, J. K. F.; Mansoor, F.; Moy, L. Y.; Mulrooney, E. F.; Necheva, A. S.; Presland, J.; Rakhilina, L.; Yang, R.; Torres, L.; Zhang-Hoover, J.; Northrup, A.; Bioorg. Med. Chem. Lett. 2017, 27, 2721. [Crossref]
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Therefore, combining anticancer agents with ABC super-family G member 2 (ABCG2) inhibitors is one method of overcoming this MDR. In addition, inhibition of the transport protein was shown to increase drug accumulation in ABCG2 overexpressing colon cancer cells HT29. In this scenario, amino-quinazolines (102) were reported as inhibitors of ABC transporters (Figure 11) in the well-known Hoechst 33342 accumulation assay, which is commonly used to assess inhibitory efficacy towards ABCG2.3232 Krapf, M. K.; Gallus, J.; Spindler, A.; Wiese, M.; Eur. J. Med. Chem. 2019, 161, 506. [Crossref]
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,3333 Krapf, M. K.; Gallus, J.; Namasivayam, V.; Wiese, M.; J. Med. Chem. 2018, 61, 7952. [Crossref]
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,113113 Krapf, M. K.; Wiese, M.; J. Med. Chem. 2016, 59, 5449. [Crossref]
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Figure 11
Chemical structures of anticancer amino-quinazoline prototypes 102-105.

Purkey et al.114114 Purkey, H.; Cancer Res. 2022, 82, ND11. [Crossref]
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reported the clinical candidate divarasib (GDC-6036) (103) as a picomolar inhibitor (Ki = 2.9 pM) of KRASG12C mutant (Figure 11). Mutations in KRAS are the most common oncogenic driver mutations in human cancers, and the KRASG12C mutation is one of the most prevalent. In this context, divarasib (103) is progressing in clinical trials with positive results for the treatment of colorectal cancer.115115 Desai, J.; Alonso, G.; Kim, S. H.; Cervantes, A.; Karasic, T.; Medina, L.; Shacham-Shmueli, E.; Cosman, R.; Falcon, A.; Gort, E.; Guren, T.; Massarelli, E.; Miller, W. H.; Paz-Ares, L.; Prenen, H.; Amatu, A.; Cremolini, C.; Kim, T. W.; Moreno, V.; Ou, S.-H. I.; Passardi, A.; Sacher, A.; Santoro, A.; Stec, R.; Ulahannan, S.; Arbour, K.; Lorusso, P.; Luo, J.; Patel, M. R.; Choi, Y.; Shi, Z.; Mandlekar, S.; Lin, M. T.; Royer-Joo, S.; Chang, J.; Jun, T.; Dharia, N. V.; Schutzman, J. L.; Han, S.-W.; Nat. Med. 2024, 30, 271. [Crossref]
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Regarding anticancer compounds with demonstrated tumor cell line cytotoxic activity, Zhang et al.2929 Zhang, Y.; Huang, Y.-J.; Xiang, H.-M.; Wang, P.-Y.; Hu, D.-Y.; Xue, W.; Song, B.-A.; Yang, S.; Eur. J. Med. Chem. 2014, 78, 23. [Crossref]
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reported the synthesis and anticancer activities of 4-(4-substituted)-piperazin-5,6,7-trialkoxy-quinazoline derivatives. Compound 104 exhibited cytotoxicity against multiple cancer cell lines, with PC-3 IC50 = 1.8 μM, MGC-803 IC50 = 2.8 μM, A375 IC50 = 1.3 μM, and A549 IC50 = 2.9 μM.2929 Zhang, Y.; Huang, Y.-J.; Xiang, H.-M.; Wang, P.-Y.; Hu, D.-Y.; Xue, W.; Song, B.-A.; Yang, S.; Eur. J. Med. Chem. 2014, 78, 23. [Crossref]
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Wang et al.4747 Wang, Z.; Liu, L.; Dai, H.; Si, X.; Zhang, L.; Li, E.; Yang, Z.; Chao, G.; Zheng, J.; Ke, Y.; Lihong, S.; Zhang, Q.; Liu, H.; Bioorg. Med. Chem. 2021, 43, 116265. [Crossref]
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reported synthesis and biological evaluation of 2,4-disubstituted quinazoline derivatives targeting cancer cells. The authors highlighted that compound 105 was the most potent against diverse cell lines, with PC-3 IC50 = 5.37 μM, MGC-803 IC50 = 6.25 μM, H1975 IC50 = 2.03 μM, and MDA-MB-231 IC50 = 8.16 μM. Additionally, this compound showed promising results in cellular and molecular biology assays, indicating its potential to interfere with the EGFR-PI3K signaling pathway.4747 Wang, Z.; Liu, L.; Dai, H.; Si, X.; Zhang, L.; Li, E.; Yang, Z.; Chao, G.; Zheng, J.; Ke, Y.; Lihong, S.; Zhang, Q.; Liu, H.; Bioorg. Med. Chem. 2021, 43, 116265. [Crossref]
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6. Amino-Quinazolines for the Treatment of Neurodegenerative Diseases

In addition to anticancer derivatives, there have been recent publications on amino-quinazolines designed for the treatment of neurodegenerative disorders. Le-Nhat-Thuy et al.4040 Le-Nhat-Thuy, G.; Thi, N. N.; Pham-The, H.; Thi, T. A. D.; Thi, H. N.; Thi, T. H. N.; Hoang, S. N.; Nguyen, T. V.; Bioorg. Med. Chem. Lett. 2020, 30, 127404. [Crossref]
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reported the synthesis and biological evaluation of quinazoline-triazole hybrid compounds as acetylcholinesterase (AChE) inhibitors, given that some therapeutic alternatives for the treatment of Alzheimer’s disease (AD) rely on AChE inhibition to increase acetylcholine (ACh) neurotransmission in the central nervous system. The authors4040 Le-Nhat-Thuy, G.; Thi, N. N.; Pham-The, H.; Thi, T. A. D.; Thi, H. N.; Thi, T. H. N.; Hoang, S. N.; Nguyen, T. V.; Bioorg. Med. Chem. Lett. 2020, 30, 127404. [Crossref]
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reported compound 106 with AChE IC50 = 0.23 μM for the potential use in AD (Figure 12).

Figure 12
Chemical structures of amino-quinazolines (106-108) designed for the treatment of neurodegenerative diseases.

Elkamhawy et al.5555 Elkamhawy, A.; Lee, J.; Park, B.-G.; Park, I.; Pae, A. N.; Roh, E. J.; Eur. J. Med. Chem. 2014, 84, 466. [Crossref]
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reported quinazoline-urea analogues as modulators of Aβ-induced mitochondrial dysfunction.

Extensive data indicate that the genesis of Alzheimer’s disease is closely linked to the overproduction of β-amyloid peptide (Aβ) and its extracellular accumulation. Furthermore, recent research116116 Zyśk, M.; Beretta, C.; Naia, L.; Dakhel, A.; Påvénius, L.; Brismar, H.; Lindskog, M.; Ankarcrona, M.; Erlandsson, A.; J. Neuroinflammation 2023, 20, 43. [Crossref]
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suggests that these soluble Aβ oligomers internally target mitochondria. In particular, the mitochondrial permeability transition pore (mPTP), a calcium-dependent, ion non-selective membrane pore, has been shown to participate in mitochondrial dysfunction potentiated by Aβ toxicity. Overactivation of mPTP has been correlated with decreased mitochondrial membrane potential, impaired mitochondrial respiration function, increased oxidative stress in AD brains.117117 Reddy, P. H.; Beal, M. F.; Trends Mol. Med. 2008, 14, 45. [Crossref]
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Consequently, the authors evaluated the amino-quinazoline 107 in an Aβ-induced mPTP opening assay, and found that this molecule had the best activity profile (Figure 12).5555 Elkamhawy, A.; Lee, J.; Park, B.-G.; Park, I.; Pae, A. N.; Roh, E. J.; Eur. J. Med. Chem. 2014, 84, 466. [Crossref]
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In the scenario of Parkinson’s disease, Zhou et al.5656 Zhou, G.; Aslanian, R.; Gallo, G.; Khan, T.; Kuang, R.; Purakkattle, B.; De Ruiz, M.; Stamford, A.; Ting, P.; Wu, H.; Wang, H.; Xiao, D.; Yu, T.; Zhang, Y.; Mullins, D.; Hodgson, R.; Bioorg. Med. Chem. Lett. 2016, 26, 1348. [Crossref]
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reported the discovery of amino-quinazoline derivatives as human A2A adenosine receptor antagonists. The adenosine A2A receptor, a member of the G-protein-coupled receptor (GPCR) family, is highly specific and abundant in the striatum of the brain. It is linked to increased cAMP levels and activation of adenylyl cyclase activity, and has become a target of study for Parkinson’s disease therapy in recent years. The authors reported compound 108 as a ligand with a hA2A Ki = 1.1 nM, and activity in an in vivo rat catalepsy assay (Figure 12).5656 Zhou, G.; Aslanian, R.; Gallo, G.; Khan, T.; Kuang, R.; Purakkattle, B.; De Ruiz, M.; Stamford, A.; Ting, P.; Wu, H.; Wang, H.; Xiao, D.; Yu, T.; Zhang, Y.; Mullins, D.; Hodgson, R.; Bioorg. Med. Chem. Lett. 2016, 26, 1348. [Crossref]
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7. Amino-Quinazolines for the Treatment of Infectious Diseases

In the infectious disease area, amino-quinazolines have been synthesized and tested against various pathogens, such as those causing Chagas disease, leishmaniosis, malaria.4444 Mendoza-Martínez, C.; Correa-Basurto, J.; Nieto-Meneses, R.; Márquez-Navarro, A.; Aguilar-Suárez, R.; Montero-Cortes, M. D.; Nogueda-Torres, B.; Suárez-Contreras, E.; Galindo-Sevilla, N.; Rojas-Rojas, Á.; Rodriguez-Lezama, A.; Hernández-Luis, F.; Eur. J. Med. Chem. 2015, 96, 296. [Crossref]
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,118118 Gilson, P. R.; Tan, C.; Jarman, K. E.; Lowes, K. N.; Curtis, J. M.; Nguyen, W.; Di Rago, A. E.; Bullen, H. E.; Prinz, B.; Duffy, S.; Baell, J. B.; Hutton, C. A.; Subroux, H. J.; Crabb, B. S.; Avery, V. M.; Cowman, A. F.; Sleebs, B. E.; J. Med. Chem. 2017, 60, 1171. [Crossref]
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,119119 Amrane, D.; Gellis, A.; Hutter, S.; Prieri, M.; Verhaeghe, P.; Azas, N.; Vanelle, P.; Primas, N.; Molecules 2020, 25, 3929. [Crossref]
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Regarding virus infections, compounds active against Chikungunya virus, hepatitis C, and influenza A have been reported.120120 Bassetto, M.; De Burghgraeve, T.; Delang, L.; Massarotti, A.; Coluccia, A.; Zonta, N.; Gatti, V.; Colombano, G.; Sorba, G.; Silvestri, R.; Tron, G. C.; Neyts, J.; Leyssen, P.; Brancale, A.; Antiviral Res. 2013, 98, 12. [Crossref]
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,121121 GBD 2015 Disease and Injury Incidence and Prevalence Collaborators; Lancet 2016, 388, 1545. [Crossref]
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,122122 Wang, M.; Zhang, G.; Wang, Y. ; Wang, J.; Zhu, M.; Cen, S.; Wang, Y. ; Bioorg. Med. Chem. Lett. 2020, 30, 127143. [Crossref]
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Additionally, bioactive amino-quinazolines have been published3131 Malasala, S.; Ahmad, M. N.; Akunuri, R.; Shukla, M.; Kaul, G.; Dasgupta, A.; Madhavi, Y. V.; Chopra, S.; Nanduri, S.; Eur. J. Med. Chem. 2021, 212, 112996. [Crossref]
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,4141 Kumar, A. S.; Kudva, J.; Bharath, B. R.; Rai, V. M.; Kumar, S. M.; Kumar, V.; Sajankila, S. P.; ChemistrySelect 2018, 3, 13586. [Crossref]
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,5353 Malasala, S.; Gour, J.; Ahmad, Md. N.; Gatadi, S.; Shukla, M.; Kaul, G.; Dasgupta, A.; Madhavi, Y. V.; Chopra, S.; Nanduri, S.; RSC Adv. 2020, 10, 43533. [Crossref]
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for the treatment of bacterial infections, such as those caused by Staphylococcus aureus and Mycobacterium tuberculosis.

Infectious parasitic diseases continue to be a significant global health concern. Chagas’ disease (CD), caused by Trypanosoma cruzi, and leishmaniasis, caused by Leishmania spp., are among these diseases, which are both classified as neglected diseases. Around 30-40% people affected by CD may develop digestive mega syndromes, cardiomyopathy, or both. Although many cases remain asymptomatic for years, if left untreated, Chagas disease can progress to severe cardiac and digestive complications. Leishmaniasis presents itself in two forms: visceral and cutaneous. It is endemic in 98 countries or territories. Cutaneous leishmaniasis causes skin sores, while visceral leishmaniasis, the most severe form, affects internal organs and can be fatal if left untreated.123123 Andrews, K. T.; Fisher, G.; Skinner-Adams, T. S.; Int. J. Parasitol.: Drugs Drug Resist. 2014, 4, 95. [Crossref]
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In turn, plasmodium parasites cause over two hundred million Malaria infections and approximately 438,000 fatalities annually. Anopheles mosquitoes transmit the parasites to humans during blood feeding. Malaria symptoms consist of fever, chills, and flu-like illness. If left untreated, the disease can lead to severe complications.124124 Siqueira-Neto, J. L.; Wicht, K. J.; Chibale, K.; Burrows, J. N.; Fidock, D. A.; Winzeler, E. A.; Nat. Rev. Drug. Discovery 2023, 22, 807. [Crossref]
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Mendoza-Martínez et al.4444 Mendoza-Martínez, C.; Correa-Basurto, J.; Nieto-Meneses, R.; Márquez-Navarro, A.; Aguilar-Suárez, R.; Montero-Cortes, M. D.; Nogueda-Torres, B.; Suárez-Contreras, E.; Galindo-Sevilla, N.; Rojas-Rojas, Á.; Rodriguez-Lezama, A.; Hernández-Luis, F.; Eur. J. Med. Chem. 2015, 96, 296. [Crossref]
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reported that 2,4,6-triamino-quinazolines can act as anti-trypanosomiasis, anti-leishmaniasis, and anti-plasmodial agents. The authors tested the compounds against Trypanosoma cruzi NINOA and INC-5 strains. Compound 109 showed NINOA median lethal concentration (LC50) = 6.28 μM and INC-5 LC50 = 43.82 μM (Figure 13). In addition, compound 109 was tested against Leishmania mexicana MHOM/BZ/61/M379 strain and had LC50 = 3.06 μM. Furthermore, compound 109 also was able to achieve 100% suppression of parasitemia and enabled survival for more than 23 days after administration in P. Berghei murine models.4444 Mendoza-Martínez, C.; Correa-Basurto, J.; Nieto-Meneses, R.; Márquez-Navarro, A.; Aguilar-Suárez, R.; Montero-Cortes, M. D.; Nogueda-Torres, B.; Suárez-Contreras, E.; Galindo-Sevilla, N.; Rojas-Rojas, Á.; Rodriguez-Lezama, A.; Hernández-Luis, F.; Eur. J. Med. Chem. 2015, 96, 296. [Crossref]
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Other amino-quinazolines have also been reported as anti-plasmodial agents, including compounds 110118118 Gilson, P. R.; Tan, C.; Jarman, K. E.; Lowes, K. N.; Curtis, J. M.; Nguyen, W.; Di Rago, A. E.; Bullen, H. E.; Prinz, B.; Duffy, S.; Baell, J. B.; Hutton, C. A.; Subroux, H. J.; Crabb, B. S.; Avery, V. M.; Cowman, A. F.; Sleebs, B. E.; J. Med. Chem. 2017, 60, 1171. [Crossref]
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and 111119119 Amrane, D.; Gellis, A.; Hutter, S.; Prieri, M.; Verhaeghe, P.; Azas, N.; Vanelle, P.; Primas, N.; Molecules 2020, 25, 3929. [Crossref]
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(Figure 13).

Figure 13
Amino-quinazolines (109-117) active against agents causing infectious diseases.

Chikungunya virus (CHIKV) is an arthritogenic alphavirus that is spread by mosquitoes and millions have been infected since 2004. Symptoms include sudden fever, severe joint pain, headache, muscle pain, rash, and fatigue. Although rarely fatal, the disease can cause long-lasting joint pain. Currently, there is no available treatment or vaccination for the illness.120120 Bassetto, M.; De Burghgraeve, T.; Delang, L.; Massarotti, A.; Coluccia, A.; Zonta, N.; Gatti, V.; Colombano, G.; Sorba, G.; Silvestri, R.; Tron, G. C.; Neyts, J.; Leyssen, P.; Brancale, A.; Antiviral Res. 2013, 98, 12. [Crossref]
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In a study reporting amino-quinazolines active against CHIKV, Hwu et al.4545 Hwu, J. R.; Roy, A.; Tsay, S.-C.; Huang, W.-C.; Lin, C.-C.; Hwang, K. C.; Hu, Y.-C.; Shieh, F.-K.; Leyssen, P.; Neyts, J.; Int. J. Mol. Sci. 2022, 23, 7646. [Crossref]
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described an amino-quinazoline linked to a coumarin ring (112) with CHIKV EC50 = 3.84 μM (Figure 13). Amino-quinazoline derivatives have also shown activity against CHIKV and hepatitis C virus (HCV).4646 Hwu, J. R.; Kapoor, M.; Gupta, N. K.; Tsay, S.-C.; Huang, W.-C.; Tan, K.-T.; Hu, Y.-C.; Lyssen, P.; Neyts, J.; Eur. J. Med. Chem. 2022, 232, 114164. [Crossref]
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HCV is a member of the Flaviviridae family of hepaciviruses. In 2015, approximately 143 million people, or 2% of the global population, were infected with HCV, resulting in approximately 326,000 fatalities.121121 GBD 2015 Disease and Injury Incidence and Prevalence Collaborators; Lancet 2016, 388, 1545. [Crossref]
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Compound 113, a quinazoline-coumarin derivative, was found to be active against CHIKV with EC50 = 3.11 μM, and HCV with EC50 = 16.6 μM.4646 Hwu, J. R.; Kapoor, M.; Gupta, N. K.; Tsay, S.-C.; Huang, W.-C.; Tan, K.-T.; Hu, Y.-C.; Lyssen, P.; Neyts, J.; Eur. J. Med. Chem. 2022, 232, 114164. [Crossref]
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Regarding compounds targeting the influenza A virus, Wang et al.122122 Wang, M.; Zhang, G.; Wang, Y. ; Wang, J.; Zhu, M.; Cen, S.; Wang, Y. ; Bioorg. Med. Chem. Lett. 2020, 30, 127143. [Crossref]
Crossref...
reported the design, synthesis and antiviral activity of 2,4-disubstituted quinazoline derivatives. The authors122122 Wang, M.; Zhang, G.; Wang, Y. ; Wang, J.; Zhu, M.; Cen, S.; Wang, Y. ; Bioorg. Med. Chem. Lett. 2020, 30, 127143. [Crossref]
Crossref...
described compound 114 (Figure 13) as the most active towards in vitro anti-influenza A assays, while also demonstrating low cytotoxicity (CC50 > 100 μM).

To address the growing problem of antibiotic resistance, it is imperative to develop new antimicrobial drugs with distinct chemical structures and modes of action. In recent years, amino-quinazolines have been investigated as antibacterials effective against M. tuberculosis and S. aureus. Malasala et al.3131 Malasala, S.; Ahmad, M. N.; Akunuri, R.; Shukla, M.; Kaul, G.; Dasgupta, A.; Madhavi, Y. V.; Chopra, S.; Nanduri, S.; Eur. J. Med. Chem. 2021, 212, 112996. [Crossref]
Crossref...
reported a new quinazoline-benzimidazole compound (115) (Figure 13) as a potent antimicrobial agent against multidrug-resistant S. aureus and M. tuberculosis. Additional studies have reported 4-substituted-piperazine-quinazolines (116),5353 Malasala, S.; Gour, J.; Ahmad, Md. N.; Gatadi, S.; Shukla, M.; Kaul, G.; Dasgupta, A.; Madhavi, Y. V.; Chopra, S.; Nanduri, S.; RSC Adv. 2020, 10, 43533. [Crossref]
Crossref...
and 4-anilino-sulfonamides-quinazolines (117)4141 Kumar, A. S.; Kudva, J.; Bharath, B. R.; Rai, V. M.; Kumar, S. M.; Kumar, V.; Sajankila, S. P.; ChemistrySelect 2018, 3, 13586. [Crossref]
Crossref...
as anti-mycobacterial agents.

8. Conclusions

In conclusion, due to the pleiotropic pharmacological effects of amino-quinazolines, the study of this privileged structure remains of importance in Medicinal Chemistry. These compounds have shown biological activities with potential application in various therapeutic areas. Researchers have made significant progress in producing diverse analogues and derivatives of amino-quinazoline chemical class using innovative synthetic methods. The structures of these amino-quinazolines have been properly modified to improve the desired pharmacological properties. These modifications have resulted in the description of novel amino-quinazoline chemical entities exhibiting remarkable bioactivities, including anticancer, anti-inflammatory, anti-parasitic, and antiviral effects. The amino-quinazoline scaffold remains present among the chemical structures of recently approved drugs and candidates in clinical trials. Therefore, this subunit holds promise in drug discovery and development, paving the way for the emergence of novel therapeutic interventions across various medical domains. Further research into the synthesis, mechanisms of action, and clinical applications of these compounds is necessary to fully realize their potential in improving therapeutics and patient outcomes.

Acknowledgments

The authors would like to thank INCT-INOFAR (Instituto Nacional de Ciência e Tecnologia de Fármacos e Medicamentos, grant number 465.249/2014-0 and CNPq 115866/2023-0, fellowship to L. S. F.), FAPERJ (Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro), CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for fellowship and financial support.

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Edited by

Editor handled this article: Carlos Maurício R. de Sant’Anna (guest)

Publication Dates

  • Publication in this collection
    08 July 2024
  • Date of issue
    2024

History

  • Received
    12 Jan 2024
  • Accepted
    12 June 2024
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