Expeditious Syntheses to Pharmochemicals 1,3-Dihydroxyacetone, 1,3-Dichloro-, 1,3-Dibromo- and 1,3-Diiodoacetone from Glycerol 1,3-Dichlorohydrin Using Homogenous and Heterogenous Medium

Silva, Fernanda Priscila N. R. da; Santos, Priscila F. dos; Silva, Sara R. B. da; Pereira, Vera Lúcia P.

doi:10.21577/0103-5053.20200058

Abstract

New efficient and reproductive routes to production of 1,3-dihydroxyacetone (1), 1,3-dichloroacetone (6), 1,3-dibromoacetone (7) and 1,3-diiodoacetone (8) from glycerol 1,3-dichlorohydrin (3) were developed. The synthesis of 1 was processed in three steps from glycerol 2 (1,3-selective chlorination of 2 to 3, oxidation of 3 to 6 and subsequent di-hydroxylation) in 51% overall yield. On the other hand, 7 and 8 were produced from³, via a trans-bromination and trans-iodination, respectively, followed by oxidation and hydroxylation steps, in 38-52% overall yield. It was used homogeneous media with different reagents (HCl/AcOH, pyridinium chlorochromate (PCC), PCC-HIO₄) and heterogeneous media with reagents supported on polymer resins such as Amberlyst^® A26-HCrO^4– form, PV-PCC (polyvinyl-pyridinium chlorochromate) and Amberlyst^® A26-OH^- form or reagents supported on alumina such as KI/Al₂O₃, KBr/Al₂O₃, in solvent free conditions.

Keywords: glycerol; PV-PCC; polymer-supported reagent; trans-halogenation; 1; 3-dihaloketones

Introduction

Glycerol (2) is a co-product of the biodiesel manufacture which is produced in 10% m/m.¹^-⁶ Its application in the chemical industry is very diverse, for example, it is used in the production of explosives, dyes, polymers, lubricants, inks, papers, synthetic intermediates for fine chemicals. Furthermore, it is used in the pharmaceutical, cosmetic and food industries.⁴ Due to increase of the biodiesel production in the global market, it is estimated that in 2020 the production of glycerol reaches approximately four billion liters.⁷ Despite the diverse glycerol uses, its growing production could cause an excess in the market and an incalculable damage to the environment could be produced if inadequate glycerol disposal was carried out.¹^-¹² Thus, it is necessary to develop new strategies to add value to glycerol. Use of glycerol for the production of oxidized compounds such as 1,3-dihydroxyacetone (1,3-DHA (1)) is of great industrial interest.¹^-⁶^,¹³^,¹⁴ The 1,3-DHA is naturally found in sugar cane and beet.¹⁵^,¹⁶ It has a great use as pharmochemical in the cosmetic, pharmaceutical, fine chemical and food industries. For example, it is utilized as active principle in tanning lotions and in the treatment of vitiligo besides, to be employed as a monomer in diverse polymeric biomaterials.¹⁷^-¹⁹

Until now, industrial production of compound 1 is carried out directly from glycerol through microbiological fermentation using Gluconobacter oxydans.²⁰^-²³ However, this route presents several complications, such as low yield, high cost, high reaction times, inhibition of the substrate, among others.²²

The chemical route for 1,3-DHA synthesis from compound² is widely studied, once the direct and selective chemical oxidation of the adjacent hydroxyls of compound² is particularly difficult because of the similar reactivity.¹^-⁷

The synthesis of 1,3-DHA directly from 2 can be observed in several electrooxidation studies involving free or supported metal catalysts (nickel, platinum, palladium, silver, gold, etc.) or even some metallic alloys (Ni-Cu, Ni-Co, Ni-Cr, Ni-Fe and Ni-Mn). However, electrocatalytic oxidation using metals is expensive, besides provides catalyst deactivation by poisoning and presents high toxicity of transition metal catalysts. Usually, it was observed a low conversion combined with a high selectivity or high conversion together with low selectivity.²⁴^-³⁹

Recently, Liu et al.⁴⁰ reported the photoelectrochemical oxidation of 1,3-DHA directly from glycerol using nanoporous BiVO₄, with high conversion and selectivity of 51%. However, side products such as glyceric acid, formic acid, glycolic acid, CO₂, CO and H₂O₂ and O₂ were observed.

To the best of our knowledge, there are only three indirect routes to 1,3-DHA (1). Zheng et al.⁴¹ performed glycerol acetalization, producing a 6:1 mixture of 5-hydroxy-2-phenyl-1,3-dioxane and (2-phenyl-1,3-dioxolan-4-yl) methanol regioisomers, which were separated by recrystallization. Subsequently, oxidation of 5-hydroxy-2-phenyl-1,3-dioxane regioisomer, followed of acetal hydrolysis led to compound¹ after a recrystallization to separation of the benzaldehyde.

In another route, Jinjuan⁴² accomplished the tosylation of compound² to the 1,3-di-p-toluenesulfonyl-2-propanol, which was then oxidized in the presence of platinum as catalyst, furnishing the toluenesulfonyloxy-2-propanone intermediate. Next, this ketone was submitted to a nucleophilic substitution step, intermediate by hydroxide ions leading to 1.

Wang et al.⁴³ reported the indirect synthesis of compound¹, via the conversion of compound² to 1,3-acetalized glycerol derivative, which was oxidized by Montanari oxidation system (NaClO/NaBr/magnetic recyclable (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO)) followed by subsequent deprotection, furnishing the 1,3-DHA in good yield.

On the other hand, 1,3-dihaloacetones are used in organic synthesis as versatile building blocks for more complex molecules.⁴⁴^-⁵⁷ Interestingly, they have been isolated from marine algae of the genus Asparagopsis taxiformis, A. armata and Falkenbergia rufolanosa.⁵⁸^,⁵⁹ The 1,3-dichloroacetone is used in the synthesis of famotidine and citric acid and as substrate in crossed aldol condensation reactions.⁵⁶^,⁵⁷ The 1,3-diiodoacetone has been used as a microbicide and algaecide for the treatment of industrial water since is not lacrimogenic as the 1,3-dibromoacetone.⁵² In addition, it is employed in organic synthesis for the construction of various heterocyclic systems through S- and N-alkylation reactions.⁴⁹^-⁵¹ Many of these heterocyclic compounds exhibit analgesic, anti-inflammatory, antiviral, antihypertensive and antitumor activities.⁴⁹^-⁵¹ Already, the 1,3-dibromoacetone (7) has been used as raw material in the quinaldine derivative synthesis, a drug used in the treatment of acute asthma.⁴⁵ In addition, compound^{7 has} been used in the synthesis of iminolactones (antibacterial),⁴⁶ aldosterone inhibitors,⁴⁷ vinylcyclopropane⁴⁷ and propranolol hydrochloride (a drug used for heart treatment).⁴⁸

In our continuing interest in the developing new routes for obtainment glycerol derivatives with high added value,¹¹^-¹⁴ we now wish to present reproductive synthetic routes to glycerol ketones 1,3-derivatives (1,3-dihydroxyacetone(1),1,3-dichloroacetone (6), 1,3-dibromoacetone (7) and 1,3-diiodoacetone (8)) from bioglycerol, a green raw material. It is worth mentioning that these C3-ketones were synthesized via process intermediated by reagents supported on polymer resins or alumina, some of them under solvent free conditions.

Results and Discussion

Initially, the known Conant’s methodology for regioselective chlorination of the glycerol was used.⁶⁰ The 1,3-dichlorohydrin (3) was obtained in 80% yield after isolating (Scheme 1).

Scheme 1
Synthesis of compounds 1, 6-8 from glycerol (2).

On the other hand, the 1,3-dibromohydrin (4) and 1,3-diiodohydrin (5) were prepared following the methodology developed recently for us,⁶¹ which consisted in the trans-halogenation of compound³, in heterogeneous media, in the absence of solvent, using alumina-supported reagents KBr/Al₂O₃ and KI/Al₂O₃, respectively. High conversions were obtained, 77 and 98%, respectively.

Next, the oxidation of compounds³-⁵ to 1,3-dihaloacetones 6-8 was investigated using various oxidizing agents, firstly in homogeneous medium and using compound 3 as model (Table 1).

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Table 1
Oxidation reaction of 3 to 6 in homogeneous medium

Initially, it was used the Steve Ley oxidation method⁶²^,⁶³ (tetrapropylammonium perruthenate (TPAP)/molecular sieve 4 Å/N-methylmorpholine-N-oxide (NMO)), at room temperature, see entries 1, 2.

Several attempts of isolation of the reaction product, using silica gel or alumina column chromatography were unsuccessful since 1,3-dichloroacetone (6), or was retained on the column or eluted along with NMO due to their similar polarities (entries 1-2).

Next, it was used Corey’s reagent, pyridinium chlorochromate (PCC), since it is a very efficient oxidation reagent to primary and secondary alcohols,⁶⁴ (entry 3). However, the desired ketone 6 was obtained in only 30% yield. The reaction was purified by column chromatography using silica gel 230 to 400 mesh. Trying to improve the yield of the oxidation, the combination of PCC and periodic acid was utilized, since this reagent association produces periodate-chlorochromate, a more powerful oxidizing specie than the PCC alone.⁶⁵ Indeed, the use of the catalyst system H₅IO₆/PCC increased the yield to 50% (entry 4).

In order to further improve the yield of the oxidation, it was theorized that the use of an oxidizing reagent supported in solid resin could minimize the isolation problems, since the product separation could proceed by a simple filtration of the heterogeneous phase, avoiding the retention of the product in the silica gel or alumina column chromatography, beyond simplify hugely the reaction work up (Table 2).

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Table 2
Reaction of oxidation of compounds 3-5 to 6-8 in heterogeneous medium

In this manner, it was tested the commercial oxidant polyvinyl-pyridinium chlorochromate (PV-PCC) at room temperature (entry 1). It was observed an improvement in the yield compared to oxidations realized with PCC and PCC/H₅IO₆, in homogeneous medium (entry 1, Table 2versus entries 3, 4, Table 1). Then, it was decided to heat the reaction based in PCC/H₅IO₆ (entry 2). However, the heating at 80 ºC led to degradation of the solid reagent, decreasing strongly the yield.

The satisfactory result obtained by matching PCC with periodic acid, in homogeneous medium (entry 6, Table 1), encouraged us to accomplish the reaction in heterogeneous medium with PV-PCC together with periodic acid (entry 3, Table 2). According to reports in the literature,⁶⁶ it is suggested that a mechanism analogous to the homogeneous medium also occurs in a heterogeneous environment. As noted, the result was very good and 6 was obtained in 80% yield, as a crystalline solid, by simple filtration on a column filled with SiO₄/Na₂SO₃ solid.

Similarly, the oxidation of 1,3-dibromohydrin 4 and 1,3-diiodohydrin 5 was mediated by PV-PCC resin (Table 2, entries 4 and 5). After 3 h none starting material was detected by thin layer chromatography and the desired 1,3-dihaloketones 7 and 8 were obtained in 80 and 60% yield, respectively. The lowest yield obtained for compound⁸ probably occurred due to its high reactivity that caused its partial decomposition under the acidic conditions used.

With the 1,3-dihaloacetones 6-8 in hands, we left for the last step of the synthetic route proposed, which consisted in the nucleophilic substitution of the halogen atoms by hydroxyl groups⁶⁷ (Scheme 1).

Thus, three equivalents of Amberlyst-A26^TM an ion-exchange resin, source of hydroxide ions, was reacted with compound⁶, using 1,4-dioxane as solvent in a reaction time ranging from 2 h, at room temperature. However, the yield obtained to compound¹ was only 35%.

The nature of the solvent showed great influence on the substitution performance. Thus, after various trials it was discovered that acetonitrile was the best solvent. The reaction was processed quickly (2 h) and cleanly at room temperature. A simple filtration led to the desired 1,3-dihydroxyketone 1 in 80% yield, as a dimeric crystalline solid. It is noteworthy that both reagents supported on resins can be regenerated by treatment with a 6 M NaOH solution (Amberlyst-A26^TM-OH form) and a 2 M CrO₃ solution (PV-PCC^TM).

It is important to mention that only in aqueous solution the dihydroxyacetone 1 is in the monomeric form due to its hydrated form HOH₂C-C(OH)₂-CH₂OH. In other solvents, it is in the dimeric form, as can be evidenced by their ¹H and ¹³C nuclear magnetic resonance (NMR) spectra, at 400 MHz.⁶⁸

Similarly, compounds 7 and 8 were transformed in 1, using Amberlyst^® A26-OH^- form/CH₃CN in 64 and 66% yield, respectively (Scheme 1). It is worth mention that it was necessary the swelling of the Amberlyst-A26^TM-OH form resin with acetonitrile and water (5:1) before reaction processing, in special if the resin was recently purchased.⁶⁹^,⁷⁰

Conclusions

Three efficient and reproducible approaches for the obtainment of the pharmochemicals 1,3-DHA 1, 1,3-dihalohydrins 3-5 and 1,3-dihaloacetones 6-8 from bioglycerol were developed. All new routes to production of the glycerol derivatives (1, 6-8) were performed in heterogeneous medium, using reagents supported on resin polymer (PV-PCC^TM), ion exchange resin (Amberlyst^® A26-OH^- form). In special, the indirect route to 1,3-DHA 1 developed for us, contrarily to direct routes mediated by different heterogeneous catalysts or selective microbiological oxidation does not suffer with problems of selectivity, conversion or reproducibility.

Experimental

General remarks

Glycerol (99.5%), acetonitrile, H₅IO₆, HCl 36% (m/m) and glacial acetic acid all P.A./A.C.S. were purchased from Vetec Química Fina Ltda (Duque de Caxias, Brazil) and used as provided. Amberlyst^® A26-OH^- form and Amberlyst^® A26-HCrO₄^- form were purchased from Sigma-Aldrich (Darmstadt, Germany) and readily utilized. The ¹H and ¹³C NMR spectra were obtained on a Varian spectrometer (400 or 500 MHz), using tetramethylsilane (TMS) as the internal reference; the chemical shift values (σ) were reported in ppm relative to TMS and values of coupling constants (J) in Hz. Gas chromatography analyses were performed every 60 min, using a gas chromatographic with flame ionization detection (GC-FID, Shimadzu GC-FID 2010; DB-1MS (100% polydimethylsiloxane) fused silica capillary column (30 m × 0.25 mm, film thickness 0.25 µm)); carrier gas H₂ (1.0 mL min^-1); temperature: injector 290 ºC, column oven 60-290 ºC at 10 ºC min^-1, FID 290 ºC). The gas chromatography mass spectrometry (GC-MS) analyses were conducted with a GC-MS Shimadzu QP500 instrument equipped with the same column used for the gas chromatograph.

1,3-Dichloro-2-propanol (3)⁶⁰

¹H NMR (400 MHz, acetone-d₆) δ 3.70 (sep, 4H), 4.08 (q, 1H), 4.70 (s, 1OH); ¹³C NMR (100 MHz, acetone-d₆) δ 45.83 (s, 2C), 70.70 (s, 1C); GC-MS (70 eV) m/z 43 (45), 79 (100).

Procedure to 1,3-dichloro-propanone (6) synthesis

Orthoperiodic acid (H₅IO₆, 0.529 g, 1.5 mmol) and 10 mL of acetonitrile were added to a round bottom flask and stirred vigorously for 15 min. Then 0.031 g (0.07 mmol) of PV-PCC resin and 0.20 g (1.55 mmol) of 1,3-dichloropropanol 3 were added. The reaction medium was left under strong stirring for 3 h. After, the reaction medium was filtered on a filter paper containing sodium sulfite, the solvent was evaporated and the residue purified over a short pad of silica gel/Na₂SO₃, eluted with AcOEt/methanol 95:5, yielding 0.158 g (80%) of 1,3-dichloro-2-propanone 6, as a white crystalline solid.

¹H NMR (400 MHz, CD₃OD) δ 3.28 (s, 1OH), 4.43 (s, 4H); ¹³C NMR (100 MHz, CD₃OD) δ 43.73 (s, 2C), 195.01 (s, 1C); GC-MS (70 eV) m/z 49 (65), 77 (100), 126 (15), 128 (10).

Procedure to 1,3-dibromo-propanone (7) synthesis

Orthoperiodic acid (H₅IO₆, 0.529 g, 1.5 mmol) and 10 mL of acetonitrile were added to a round bottom flask and stirred vigorously for 15 min, then 0.031 g (0.07 mmol) of PV-PCC resin and 0.33 g (1.5 mmol) of 1,3-dibromopropanol 4 were added. The reaction medium was left under strong stirring for 3 h. After, the reaction medium was filtered on a filter paper, the solvent was evaporated and the residue purified over a short pad of silica gel/NaSO₃, yielding 0.26 g (80%) of 1,3-dibromo-2-propanone 7, as a brown crystalline solid.

¹H NMR (400 MHz, CDCl₃) δ 4.18 (s, 4 H); ¹³C NMR (100 MHz, CDCl₃) δ 30.99 (s, 2C), 193.70 (s, 1C).

Procedure to 1,3-diiodo-propanone (8) synthesis

To a round bottom flask was added periodic acid (H₅IO₆, 0.529 g, 1.5 mmol) and acetonitrile (10 mL). The suspension formed was stirred for 15 min. Then, PV-PCC resin (0.031 g, 0.07 mmol) and 1,3-diiodopropanol 5 (0.32 g, 1.0 mmol) were added. The reaction medium was left under strong stirring for 3 h. Next, the heterogeneous medium was filtered on a filter paper and the solvent evaporated, furnishing a viscous brownish liquid. Next, the liquid was diluted in ether (20 mL) and washed with a Na₂S₂O₃ 1% solution (20 mL). The organic phase was dried over anhydrous Na₂SO₄, filtered and concentrated under reduced pressure, affording the oxidation product 8 (0.19 g, 63% yield), as a yellow viscous liquid in satisfactory purity.

¹H NMR (400 MHz, CDCl₃) δ 4.23 (s, 4 H); ¹³C NMR (100 MHz, CDCl₃) δ 1.96 (s, 2C), 195.63 (s, 1C); GC-MS (70 eV) m/z 141 (45), 183 (100), 310 (45).

General procedure to 1,3-dihydroxyacetone (1) synthesis from 6-8

Amberlyst^® A26-OH^- form resin (4 g, 3 mmol) was added to a round bottom flask of 50 mL, then acetonitrile (10 mL) was added followed by 1,3-dichloro-propanone 6 (0.20 g, 1.57 mmol). The reaction medium was stirred under magnetic stirring for 3 h, at room temperature. The reaction medium was filtered through a simple funnel covered with filter paper and evaporated to give 0.113 g (80%) of the desired 1,3-DHA 1, as a dimer.

Spectra data for the monomer 1

¹H NMR (500 MHz, D₂O) δ 3.56 (s, 4H), 4.40 (s, 4H), 4.80 (s, 2OH); ¹³C NMR (125 MHz, D₂O) δ 66.52 (s, 2C), 67.80 (s, 2C), 113.81 (s, 1C), 214.95 (s, 1C); GC-MS (70 eV) m/z 42 (100), 60 (45), 72 (40), 90 (5).

Spectra data for the dimer of 1

¹H NMR (400 MHz, CD₃OD) δ 3.60 (dd, 8H), 4.87 (s, 4OH); ¹³C NMR (100 MHz, CD₃OD) δ 57.27 (s, 2C), 58.06 (s, 2C), 101.03 (s, 2C).

Supplementary Information

Supplementary data are available free of charge at http://jbcs.sbq.org.br as PDF file.

Acknowledgments

We thank CAPES and CNPq for fellowships for some authors.

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Publication Dates

Publication in this collection
27 July 2020
Date of issue
Aug 2020

History

Received
3 Nov 2019
Accepted
1 Apr 2020

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entry	Oxidant/Co-oxidant (equiv.)	Solvent	time / h	Yield / %
1	TPAP (0.04)/NMO (2.0)	^a a Acetonitrile or 1,4-dioxane;	24	-^b b no product was recovered after silica gel column filtration eluted with Ac2OEt;
2	TPAP (0.1)/NMO (1.5)	^a a Acetonitrile or 1,4-dioxane;	4	-^c c it was recovered a mixture of 6 and NMO, after filtration through a short bed of silica gel eluted with AcOEt:MeOH, 95:5. TPAP: pyridinium chlorochromate; NMO: N-methylmorpholine-N-oxide; PCC: pyridinium chlorochromate.
3	PCC (1.5)/none	CH₂Cl₂	24	30
4	PCC (0.07)/H₅IO₆ (1.5)	^a a Acetonitrile or 1,4-dioxane;	24	50


entry	Oxidant (equiv.)	Dihalohydrin	Temperature / ºC	time / h	Product	Yield^a a Product isolated after filtration on a column filled with SiO4/Na2SO3 solid; / %
1	PV-PCC (1.5)	3	rt	3	6	60
2	PV-PCC (1.5)	3	80	3	6	20
3	PV-PCC (0.07), H₅IO₆ (1.5)	3	rt	3	6	80
4	PV-PCC (0.07), H₅IO₆ (1.5)	4	rt	3	7	80
5	PV-PCC (0.07), H₅IO₆ (1.5)	5	rt	3	8	60^b b product isolated after liquid-liquid extraction. PV-PCC: polyvinyl pyridinium chlorochromate; rt: room temperature.