METHOD FOR PRODUCING OPTICALLY ACTIVE 2-HYDROXY ESTER AND NOVEL INTERMEDIATE COMPOUND
申请人:Shiina Isamu
公开号:US20110319650A1
公开(公告)日:2011-12-29
Disclosed is a method for producing an optically active 2-hydroxy ester, comprising selectively esterifying one enantiomer of a racemic 2-hydroxy ester in a solvent containing a catalyst such as tetramisole or benzotetramisole, and a carboxylic acid anhydride, or a carboxylic acid anhydride and a carboxylic acid. In particular, in the case where the solvent contains a carboxylic acid anhydride, but does not contain a carboxylic acid, as the carboxylic acid anhydride, a carboxylic acid anhydride containing a tertiary or quaternary carbon atom in the a-position is used. On the other hand, in the case where the solvent contains a carboxylic acid anhydride and a carboxylic acid, as the carboxylic acid, a carboxylic acid containing a tertiary or quaternary carbon atom in the a-position is used.
揭示了一种生产光学活性2-羟基酯的方法,包括在含有催化剂(如四氮唑或苯基四氮唑)和羧酸酐,或者羧酸酐和羧酸的溶剂中,选择性地酯化一个二羟基酯的对映体。特别是,在溶剂中含有羧酸酐但不含有羧酸的情况下,作为羧酸酐,使用含有三级或四级碳原子的α-位置的羧酸酐。另一方面,在溶剂中含有羧酸酐和羧酸的情况下,作为羧酸,使用含有三级或四级碳原子的α-位置的羧酸。