作者:Mihaela C. Turcu、Maria Rantapaju、Liisa T. Kanerva
DOI:10.1002/ejoc.200900672
日期:2009.11
resolution of three dorzolamide intermediates has been studied in the presence of Burkholderia cepacia lipase in organic solvents. All the stereoisomers of 6-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-ol were prepared starting from the racemic cis-dihydrothiopyranol intermediate giving first the 4R,6S and 4S,6R enantiomers. Subsequent epimerization and purification of the trans enantiomers by enzymatic
在有机溶剂中洋葱伯克霍尔德菌脂肪酶存在下研究了三种多佐胺中间体的动力学拆分。6-甲基-5,6-二氢-4H-噻吩并[2,3-b]噻喃-4-醇的所有立体异构体都是从外消旋顺式-二氢噻喃醇中间体开始制备的,首先得到4R,6S和4S,6R对映异构体. 随后通过酶促酰化或醇解对反式对映异构体进行差向异构化和纯化,然后得到顺式对映异构体。顺式-4-羟基-6-甲基-5,6-二氢-4H-噻吩并[2,3-b]噻喃 7,7-二氧化物对映体也通过酶动力学拆分制备。使用脂肪酶对 3-(2-噻吩基硫基) 丁酸乙酯进行动力学拆分可提供中等的对映选择性,但该方法并未用于该底物的制备规模。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim,