申请人:——
公开号:US20030109719A1
公开(公告)日:2003-06-12
The invention provides a process for producing optically active azetidine-2-carboxylic acid with good efficiency, expedience, and commercial advantage,
which comprises cyclizing an optically active 4-amino-2-halogenobutyric acid in an optical yield of as high as 90% or more.
It is a process for producing optically active azetidine-2-carboxylic acid of the general formula (2), in which * denotes an asymmetric carbon atom,
which comprises cyclizing an optically active 4-amino-2-halogenobutyric acid of the general formula (
1
), in which X represents a halogen atom and * denotes an asymmetric carbon atom,
in the presence of an oxide of an alkaline earth metal, a hydroxide of an alkaline earth metal excepting barium, or an organic amine.
1
该发明提供了一种生产具有良好效率、便利性和商业优势的光学活性环氧丙氨酸的方法,该方法包括在光学产率高达90%或更高的情况下,使光学活性的4-氨基-2-卤代丁酸环化。这是一种生产一般式(2)中的光学活性环氧丙氨酸的方法,其中*表示一个不对称碳原子,该方法包括在碱土金属的氧化物、除钡外的碱土金属的氢氧化物或有机胺的存在下,使一般式(1)中的光学活性4-氨基-2-卤代丁酸环化,其中X代表卤素原子,*表示不对称碳原子。