Novel synthetic method of antiepileptic drug levetiracetam

An antiepileptic drug, a new synthesis technology, applied in the field of chiral drug synthesis technology, can solve the problem of no reported analytical data on the chemical purity and optical purity of the final product, and achieve simple and easy reaction operations, high yields, and conditions mild effect

Inactive Publication Date: 2013-01-09
SHANGHAI ECUST BIOMEDICINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its final yield can reach 80%, but this patent does not report the analytical data of final product chemical purity and optical purity

Method used

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  • Novel synthetic method of antiepileptic drug levetiracetam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0032] Add LV40 (24 g, 0.14 mol) and dichloromethane (100 mL) into a 250 mL four-neck round bottom flask, stir and cool down to 0-5°C. Keep warm at -5~0°C, slowly add 26.7g (0.14mol) of p-toluenesulfonyl chloride dissolved in 50ml of dichloromethane dropwise, after 10±2min, stir the reaction for 25~30min, cool down to -5~0°C, Ammonia gas was started. Detect once with HPLC every 1 hour, after continuing to feed ammonia gas for 5 hours, HPLC shows that the content of raw material is less than 1.0%, stop feeding ammonia gas.

[0033] The reaction solution was filtered, the filter cake was washed with dichloromethane (15ml×3), and the filtrates were combined to obtain a light yellow clear solution. The solvent dichloromethane was evaporated under reduced pressure at 35-38°C to obtain crude levetiracetam.

[0034] Add 260ml of ethyl acetate to the crude product and heat to 60-65°C to dissolve. After complete dissolution and clarification, it was filtered while hot, and the filtr...

Embodiment example 2

[0036]Add LV40 (34.0 g, 0.2 mol) and dichloromethane (120 mL) into a 250 mL four-neck round bottom flask, stir and cool down to 0-5°C. Slowly add 24.0 g (0.21 mol) of methanesulfonyl chloride dropwise at 0-5°C under temperature control, after 10±2 minutes to complete the dripping, stir the reaction for about 30±5 minutes, cool down to 0-5°C, and start feeding ammonia gas. Detect once with HPLC every 1 hour, after continuing to flow ammonia gas for 6 hours, HPLC shows that the raw material content is less than 1.0%, stop passing ammonia gas.

[0037] The reaction solution was filtered, the filter cake was washed with dichloromethane (15ml×3), and the filtrate was combined. The filtrate was a slightly yellow clear liquid, and the solvent dichloromethane was rotary evaporated under reduced pressure at 35 to 38°C, and a white solid was gradually precipitated to obtain Etiracetam crude. Add 320ml of ethyl acetate to the crude product and heat to 60-65°C to dissolve. After complet...

Embodiment example 3

[0039] Add LV40 (34 g, 0.2 mol) and toluene (240 mL) into a 250 mL four-neck round bottom flask, stir and cool down to 0-5°C. Keep warm at -5~0°C, slowly add 24.0g (0.21mol) of methanesulfonyl chloride dropwise, 10±2min to complete the drop, stir for 25~30min, cool down to -5~0°C, and start to feed ammonia gas. Detect once with HPLC every 1 hour, after continuing to feed ammonia gas for 6 hours, HPLC shows that the content of raw material is less than 1.0%, stop feeding ammonia gas.

[0040] The reaction solution was filtered, the filter cake was washed with toluene (15ml×3), and the filtrates were combined to obtain a light yellow clear solution. The solvent toluene was rotary evaporated at 65-70°C under reduced pressure to obtain crude levetiracetam, which was added with 320ml of ethyl acetate and heated to 60-63°C to dissolve. After complete dissolution and clarification, it was filtered while hot, and the filtrate was cooled and crystallized slowly. Suction filtration af...

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Abstract

The invention belongs to the field of synthetic processes of chiral drugs and discloses a novel synthetic method of antiepileptic drug levetiracetam. (S)-alpha-ethyl-oxo-1-pyrrolidine acetic acid is used as an initial raw material and subjected to further reaction under the catalysis of methanesulfonyl chloride and the action of ammonia to prepare the levetiracetam. The novel synthetic method of the antiepileptic drug levetiracetam is simple in operating, few in by-products, high in yield and suitable for industrial large-scale production in factories.

Description

technical field [0001] The invention belongs to the field of synthesis technology of chiral drugs, and discloses a new synthesis method of antiepileptic drug levetiracetam. Using (S)-α-ethyl-oxo-1-pyrrolidineacetic acid as the starting material, levetiracetam is prepared by one-step reaction with ammonia gas under the action of catalyst methanesulfonyl chloride and the like. The method does not need acid-binding agents such as triethylamine, pyridine and sodium hydroxide reported in the original literature, has the advantages of simple operation, few by-products, high yield, etc., and is suitable for large-scale industrial production. Background technique [0002] Levetiracetam chemical name: (S)-2-(2-oxopyrrolidin-1-yl)butyramide, English name: (S)-2-(2-Oxopyrrolidin-1-yl) butanamide, formula C 8 h 14 N 2 o 2 , molecular weight: 170.21, chemical structural formula: [0003] [0004] Levetiracetam is a second-generation acetylcholine agonist developed by UCB company...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/27
Inventor 吴范宏杨燕周军全俞晓东
Owner SHANGHAI ECUST BIOMEDICINE CO LTD
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