Enzyme-Catalyzed Kinetic Resolution of 1,3-anti-Diol Monoesters – Efficient Preparation of Enantiomerically Highly Enriched and Unsymmetrically Substituted 1,3-anti-Diols
作者:Florian Jakob、Christoph Schneider
DOI:10.1002/ejoc.200700096
日期:2007.6
3-anti-diol monoesters which have been obtained through a zirconium-catalyzed aldol-Tishchenko reaction. The product 1,3-anti-diol diesters were formed in yields close to 50 % and >98 % ee. Separation from the unreactive enantiomers and subsequent hydrolysis furnished both enantiomers of unsymmetrically substituted 1,3-anti-diols in high optical purities. Alternatively, the kinetic resolution process can
南极假丝酵母脂肪酶 B (CALB) 催化 1,3-抗二醇单酯的高度对映选择性乙酰化,该单酯是通过锆催化的羟醛-Tishchenko 反应获得的。产物1,3-反二醇二酯以接近50%和>98%ee的产率形成。从非反应性对映异构体中分离出来并随后水解,得到高光学纯度的不对称取代的 1,3-反二醇的两种对映异构体。或者,可以更快地对游离的 1,3-抗二醇进行动力学拆分过程,并获得同样好的结果。反应过程中缓慢的酰基迁移会略微破坏非反应性对映体的对映体过量。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)