Process for preparation of optically active n-substituted azetidine-2-carboxylic acids
申请人:——
公开号:US20030045730A1
公开(公告)日:2003-03-06
The object of the present invention is to produce an optically active N-substituted azetidine-2-carboxylic acid by an efficient, expedient and commercially profitable process.
The present invention provides a production method of an optically active N-substituted azetidine-2-carboxylic acid which comprises cyclizing an optically active 4-substituted amino-2-halobutyric acid in the presence of a base.
A 2- or 4-nitrobenzenesulfonamide is allowed to react with an alkali metal alkoxide to remove a nitrobenzenesulfonyl group to thereby obtain an amine corresponding to the amide. Furthermore, a method for producing an amine derivative by allowing the resulting amine without isolation to react with an activated, substituted oxycarbonyl compound or an activated acyl compound is provided. According to this method, a corresponding free amine and its substituted derivative can be produced easily and industrially advantageously from the 2- or 4-nitrobenzenesulfonamide without using a thiol compound.
Process for producing optically active N-substituted azetidine-2-carboxylic acid compound
申请人:Sumitomo Chemical Company, Limited
公开号:EP0974670A2
公开(公告)日:2000-01-26
There is provided a process for producing an optically active N-substituted azetidine-2-carboxylic acid compound represented by the formula (2):
by contacting a corresponding N-substituted azetidine-2-carboxylic acid ester of formula (2) with an enzyme derived from a microorganism selected from Arthrobacter SC-6-98-28 strain, Arthrobacter sp. ATCC21908 strain, Chromobacterium SC-YM-1 strain, and a mutant thereof. A process is also provided for preparing an optically active azetidine-2-carboxylic acid by eliminating the N-substituent of a N-substituted azetidine-2-carboxylic acid ester of formula (2).