Heterocycles 35. CaL-B mediated synthesis of enantiomerically pure (R)- and (S)-ethyl 3-(2-arylthiazol-4-yl)-3-hydroxypropanoates
作者:Annamária Varga、Mara Ana Naghi、Melinda Füstös、Gabriel Katona、Valentin Zaharia
DOI:10.1016/j.tetasy.2014.01.013
日期:2014.2
Herein we present the lipase catalyzed synthesis of four new enantiomerically pure (R)- and (S)-ethyl 3-(2-arylthiazol-4-yl)-3-hydroxypropanoates and their butanoates by enzymatic enantioselective acylation of the racemic alcohols rac-1a–d and by ethanolysis of the corresponding racemic esters rac-2a–d mediated by lipase B from Candida antarctica (CaL-B) in organic solvents. In terms of stereoselectivity
在此我们提出的四个新的对映体纯(脂肪酶催化合成- [R )-和(小号) -乙基3-(2- arylthiazol -4-基)-3- hydroxypropanoates及其丁酸酯通过外消旋的醇的对映选择性酶促酰化外消旋- 1a - d以及相应的外消旋酯rac - 2a - d的乙醇化反应,由南极假丝酵母的脂肪酶B (CaL-B)在有机溶剂中介导。就立体选择性和活性而言,酰化和醇解这两种方法均成功(50%转化率,E ≫ 200)。分辨率产品的绝对构型由一个详细确定1个(的Mosher氏衍生物的1 H NMR研究小号- )1a中。