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Preparation method of posaconazole main ring

A technology of posaconazole main ring and sodium triazole, which is applied in the field of organic synthesis, can solve problems affecting yield, etc., and achieve the effects of stable reaction, safe operation and good selectivity

Active Publication Date: 2016-03-30
CHONGQING WEIPENG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] India MSN Laboratories Limited announced the route in 2012 on US2014343285A1: m-difluorobenzene is used as the starting material, through Friedel-Crafts acylation, wittig, condensed amides, methylolation, halogenated ring closure, reduction, aminoalkylation, The target product is obtained by esterification, but this line is prone to produce intramolecular ring-closing impurities, which can be removed, but affect the yield

Method used

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  • Preparation method of posaconazole main ring
  • Preparation method of posaconazole main ring
  • Preparation method of posaconazole main ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 prepares compound F

[0020] Referring to the method published by India MSN Laboratories Limited on US2014343285A1, compound F was prepared using m-difluorobenzene as a starting material, and the following steps were followed:

[0021] 1. Add 450g (1eq) m-difluorobenzene and 360g (1eq) succinic anhydride to a 10L three-necked flask at room temperature, add 4.5L dichloromethane (DCM), and then add 1200g (2.5eq) AlCl in batches 3 , the temperature should not exceed 30°C, and the color will slowly turn orange-red. After adding, react at room temperature for 4h, and the reaction is complete. Pour the reaction liquid into 3.6L 6NHCl slowly, and stir slowly, the temperature should not exceed 30°C. The organic phase was separated, and the aqueous phase was extracted with 1L*3 DCM. The combined organic phases were washed with 4.5L*2 saturated brine, dried over anhydrous sodium sulfate, and concentrated to dryness under reduced pressure. Add 450ml of DCM and 4500...

Embodiment 2

[0027] Embodiment 2 prepares target compound J with compound F

[0028] Follow the steps below:

[0029] 1) Take 180g (1eq) of compound F prepared in Example 1 and add it into 1.8L of methanol, under nitrogen protection, cool down to 0-10°C, add 175g (3eq) of thionyl chloride (SOCl) dropwise 2), then reflux for 12 hours, the reaction solution was concentrated to dryness under reduced pressure, 900ml of water was added to the residue, extracted with 300ml*3 ethyl acetate (EA), combined EA, washed with 300ml of saturated sodium carbonate, washed with 300ml of water, washed with 300ml of saturated brine, Dry over anhydrous sodium sulfate and concentrate to dryness under reduced pressure to obtain 190 g of compound G, Y>100%, pur=96.2%.

[0030] 2) Add 150g (1eq) of compound G to 1.5LDMF, add 178.6g (5eq) of sodium triazole and 38ml of 1,3-dimethylpropylene urea (DMPU), heat to 100-110°C and stir for 24 hours. Cool down to room temperature, add 1.5L of water to the reaction solu...

Embodiment 3

[0032] 4) Add 60g (1eq) of compound I to 600ml of DCM, then add 24.6g (1.2eq) of triethylamine (TEA) and 2.5g (0.1eq) of 4-dimethylaminopyridine (DMAP). Under nitrogen protection, lower the temperature to 0°C and add 44g (1eq) 4-methylbenzenesulfonyl chloride (TsCl) at one time (the amount of TEA needs to be more than TsCl) to rise to room temperature and react overnight. The reaction solution is washed with 200ml 1N HCl, and then saturated with 100ml of water Washed with sodium bicarbonate, washed with 100ml saturated brine, Na 2 SO 4 Dry, filter, and spin dry to obtain a yellow oil, add 360ml of isopropanol, stir to dissolve at 50-60°C, add dropwise 360ml of n-heptane, drop to room temperature and stir for 1.5 hours, filter with suction, and wash with 100ml of n-heptane , to obtain white solid compound J75.1g, Y=82.2%, pur=98.7%. Embodiment 3 prepares target compound J with compound F

[0033] Follow the steps below:

[0034] 1) Take 180g (1eq) of compound F prepared in ...

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Abstract

The invention discloses a preparation method of a posaconazole main ring. The preparation method comprises steps as follows: 1), a compound F is dissolved in an organic solvent I, then thionyl chloride is added for reaction, and a compound G is obtained; 2), the compound G is added to an organic solvent II, triazole sodium and a dissolving promoter are added for reaction, and a compound H is generated; 3), the compound H is added to an organic solvent III, zinc chloride and sodium borohydride or potassium borohydride are added for reaction, and a compound I is obtained; 4), the compound I is added to an organic solvent IV, alkali, 4-dimethylaminopyridine and 4-methyl-benzene sulfonyl chloride are added for reaction, and a target compound J is obtained. The method has the advantages of good selectivity, safety in operation, stable reaction and high yield, and the problems of high probability of generation of intramolecular ring-closure impurities and low yield of an original synthetic route are solved.

Description

technical field [0001] The present invention relates to the field of organic synthesis, in particular to a main ring of posaconazole—((3S,5R)-5-((1H-1,2,4-triazol-1-yl)methyl)-5 A preparation method of -(2,4-difluorophenyl)tetrahydrofuran-3-yl)methyl p-toluenesulfonate. Background technique [0002] Posaconazole (posaconazole) is a derivative of itraconazole. It is a second-generation triazole antifungal drug listed on the FDA in 2006. The trade name is NOXAFIL. The original manufacturer is Schering-Plough. Schering-Plough disclosed the synthesis route of the main ring of posaconazole in US5661151A in 1995. It uses 2'-chloro-2,4-difluoroacetophenone as the starting material, and through the Wittig reaction, the configuration is reversed to finally obtain end product. But this process line is too long, wherein there are four steps need to use NaH, and the third step uses peroxide, the risk is too high. The synthetic route is as follows: [0003] [0004] In 2012, Santo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D405/06
CPCC07D405/06
Inventor 韩公超周之良周兴国向永向林玲龚雪
Owner CHONGQING WEIPENG PHARMA
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