Enzymatic Resolution of Chlorohydrins for the Synthesis of Enantiomerically Enriched 2-Vinyloxiranes
作者:Mark Lautens、J. McCubbin、Matthew Maddess
DOI:10.1055/s-2007-1000845
日期:2008.1
A series of vinylchlorohydrins are resolved by enzymatic kinetic resolution. The resulting R-alcohols, obtained in up to 99% ee, are stereoselectively converted into vinyloxiranes in high yield. The S-acetates, obtained in up to 99% ee were either deprotected to S-alcohols, or cyclized directly to vinyl oxiranes under basic conditions, with moderate to no loss in ee. The results are consistent with
通过酶动力学拆分来拆分一系列乙烯基氯醇。所得的 R-醇以高达 99% 的 ee 获得,以高产率立体选择性地转化为乙烯基环氧乙烷。以高达 99% ee 获得的 S-乙酸酯要么脱保护为 S-醇,要么在碱性条件下直接环化为乙烯基环氧乙烷,ee 中度至无损失。结果与涉及脱保护过程中醋酸盐可逆迁移的外消旋化机制一致。