Preparation method of brivaracetam

A compound and equivalent technology, applied in the direction of organic chemistry, can solve the problems of uneconomical utilization of raw materials, no construction of butyrolactam, etc., and achieve the effects of low price, easy separation and purification, and easy availability of raw materials

Active Publication Date: 2017-02-22
SUZHOU PENGXU PHARM TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] None of the above-mentioned routes have constructed the chiral center of the n-propyl group on butyrolactam, but obtained optically pure brivaracetam in the final product through chiral high-performance liquid phase purification, and the utilization of raw materials is not economical

Method used

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  • Preparation method of brivaracetam
  • Preparation method of brivaracetam
  • Preparation method of brivaracetam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1 prepares compound 3

[0057] Sodium methoxide (2.0kg, 37.03mol) was added into 44.5kg of absolute ethanol to dissolve completely, and diethyl malonate (6.0kg, 37.46mol) was added at an external temperature of 10°C. Stir at this temperature for 10 minutes, the system rises to room temperature, slowly add (R)-epichlorohydrin (ee>99%) (3.3kg, 35.67mol) (purchased from Anaiji Chemical) to the reaction system, add After completion, the system reacted under reflux for 2 hours, stopped the reaction, cooled the system to room temperature, spin-dried the solvent, added 19.03 kg of water, and extracted twice with 17.0 kg and 12 kg of ethyl acetate. The organic phases were combined, dried over anhydrous sodium sulfate, filtered after drying, the filtrate was spin-dried, and distilled under reduced pressure to obtain a colorless liquid. Compound 3 was obtained with a yield of 50%. Compound 3 chiral HPLC (ee 98.5%)

[0058] The NMR data of compound 3 are as follows: ...

Embodiment 2

[0059] Embodiment 2 prepares compound 4

[0060] Add a 2-methyltetrahydrofuran solution (1.29mol / kg, 2.44kg, 3.14mol) of ethyl Grignard reagent to the reaction kettle, control the internal temperature at -20--30°C, add CuI (108.3g, 0.57mol) The reaction system was stirred for 30 min, and then the dry 2-methyltetrahydrofuran solution of compound 3 (434 g, 2.55 mol) prepared by the method described in Example 1 was added dropwise to the reaction flask. After the dropwise addition was completed, after stirring at this temperature for 30 minutes, the reaction was quenched with saturated ammonium chloride, and the solution of compound 4 in 2-methyltetrahydrofuran was obtained by liquid separation, with a yield of 64%.

[0061] Purification by column chromatography (developing solvent polarity: petroleum ether / ethyl acetate=10 / 1) to obtain the nuclear magnetic data of the purified compound 4 is as follows: 1 H NMR (400MHz, CDCl 3 )δ4.52(1H, dd), 4.27(2H, q), 3.92(1H, dd), 3.23(1...

Embodiment 3

[0063] Embodiment 3 prepares compound 4

[0064] Add a solution of ethyl Grignard reagent in 2-methyltetrahydrofuran (1.29kg / mol, 63.51g, 81.93mmol) into the reaction flask, place the reaction flask in a low-temperature reaction bath, and control the internal temperature to -20--30°C, Add CuI (2.22g, 11.70mol) to the reaction flask and stir for 0.5 hours, then add dropwise the dry 2-methyl alcohol of compound 3 (10.0g, 58.52mmol) prepared as described in Example 1 to the reaction flask. THF solution. After the dropwise addition was completed, after stirring at this temperature for 30 minutes, the reaction was quenched with saturated ammonium chloride, and the solution of compound 4 in 2-methyltetrahydrofuran was obtained by liquid separation, with a yield of 87%.

[0065] Purification by column chromatography (developing solvent polarity: petroleum ether / ethyl acetate=10 / 1) to obtain the nuclear magnetic data of the purified compound 4 is as follows: 1 H NMR (400MHz, CDCl ...

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Abstract

The invention provides a method for synthesizing brivaracetam. Raw materials used in the method are available and inexpensive, a preparation process avoids appearance of chiral isomers difficult to separate, purification means such as column chromatography purification and the like adverse to industrial amplification production is avoided, a synthesis process is not involved with expensive and toxic heavy metal and chiral ligands, and a product brivaracetam with high quality and high optical purity can be obtained.

Description

technical field [0001] The application relates to the field of drug synthesis, in particular to a method for synthesizing buvaracetam. Background technique [0002] Epilepsy is a common disease of the nervous system, with an incidence rate of 0.6% to 1.1% in the population, and 60% to 70% of patients will still have seizures while taking antiepileptic drugs, causing some patients to stop drug treatment by themselves. At present, there are more than 6 million epilepsy patients in my country, and 650,000 to 700,000 new epilepsy patients are diagnosed every year, and about 25% of them are refractory epilepsy. Although great progress has been made in the diagnosis and treatment of epilepsy, the number of patients with intractable epilepsy is increasing day by day. Generalized intractable epilepsy refers to epilepsy and epilepsy syndromes that cannot be terminated by the current standard treatment of antiepileptic drugs (AEDs) or have been clinically proven to be intractable. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/27
CPCC07D207/27
Inventor 李丕旭王鹏魏强刘远华
Owner SUZHOU PENGXU PHARM TECH CO LTD
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