METHOD FOR PRODUCING OPTICALLY ACTIVE ESTER AND METHOD FOR PRODUCING OPTICALLY ACTIVE CARBOXYLIC ACID
申请人:Shiina Isamu
公开号:US20100234610A1
公开(公告)日:2010-09-16
Disclosed is a method for producing an optically active ester by highly selectively esterifying one enantiomer of a racemic carboxylic acid, while producing an optically active carboxylic acid which is the other enantiomer. An optically active ester is produced while producing an optically active carboxylic acid at the same time by reacting a racemic carboxylic acid with a specific alcohol or phenol derivative in the presence of benzoic anhydride or a derivative thereof and a catalyst such as tetramisole or benzotetramisole, thereby selectively esterifying one enantiomer of the racemic carboxylic acid.
Kinetic Resolution of Racemic α-Arylalkanoic Acids with Achiral Alcohols via the Asymmetric Esterification Using Carboxylic Anhydrides and Acyl-Transfer Catalysts
enantioselective coupling reaction betweenracemic carboxylic acids and a novel nucleophile, bis(alpha-naphthyl)methanol, to give the corresponding esters with high ee's. This protocol was successfully applied to the production of nonracemic nonsteroidal anti-inflammatory drugs from racemiccompounds utilizing the transacylation process to generate the mixed anhydrides from the acid components with the suitable carboxylic
通过使用非手性醇、芳香族或脂肪族羧酸酐和手性酰基转移催化剂对外消旋 α-取代羧酸进行动力学拆分,可以生产多种光学活性羧酸酯。4-甲氧基苯甲酸酐 (PMBA) 或新戊酸酐与改性苯并四甲醚型催化剂 ((S)-β-Np-BTM) 的组合对于促进外消旋羧酸与新型亲核试剂之间的对映选择性偶联反应最有效, 双(α-萘基)甲醇,得到相应的具有高 ee 的酯。
Kinetic Resolution of Racemic Carboxylic Acids Using Achiral Alcohols by the Promotion of Benzoic Anhydrides and Tetramisole Derivatives: Production of Chiral Nonsteroidal Anti-Inflammatory Drugs and Their Esters
作者:Isamu Shiina、Kenya Nakata、Yu-suke Onda
DOI:10.1002/ejoc.200800942
日期:2008.12
carboxylic esters were produced by kinetic resolution of racemic carboxylic acids by using achiral alcohols, benzoic anhydrides, and Birman's tetramisole-type catalysts. Bis(α-naphthyl)methanol is a very effective reagent for producing the corresponding esters with high ee values in the presence of 4-methoxybenzoic anhydride (PMBA) as the coupling reagent by promotion of benzotetramisole derivatives (BTM