Heterocycles 32. Efficient kinetic resolution of 1-(2-arylthiazol-4-yl)ethanols and their acetates using lipase B from Candida antarctica
作者:Denisa Hapău、Jürgen Brem、Mădălina Moisă、Monica-Ioana Toşa、Florin Dan Irimie、Valentin Zaharia
DOI:10.1016/j.molcatb.2013.05.005
日期:2013.10
chemoenzymatic synthesis of new enantiomerically enriched (R)- and (S)-1-(2-arylthiazol-4-yl)ethanols and their acetates by enzymatic enantioselective acetylation of the racemic alcohols rac-2a–d and by methanolysis of the corresponding racemic esters rac-3a–d mediated by lipase B from Candida antarctica (CaL-B) in non-aqueous media. In terms of stereoselectivity and activity, both procedures, acylation
在本文中,我们描述了外消旋醇rac - 2a - d和外消旋醇的对映体选择性乙酰化反应,通过化学酶法合成了新的对映体富集的(R)-和(S)-1-(2-芳基噻唑-4-基)乙醇及其乙酸酯。非水介质中由南极假丝酵母脂肪酶B介导的相应外消旋酯rac -3 a - d的甲醇分解反应。就立体选择性和活性而言,酰化和醇解两种方法均获得了相似的良好结果(50%转化率,E ≫ 200)。动力学拆分产物的绝对构型由(S)-2b Mosher衍生物的详细1 H NMR研究确定。