Stereoselective total synthesis of both (6R,9R,10S,7E)- and (6S,9R,10S,7E)-epimers of oxylipin (9R,10S,7E)-6,9,10-trihydroxyoctadec-7-enoic acid
作者:Bishwajit Saikia、Thongam Joymati Devi、Nabin C. Barua
DOI:10.1016/j.tet.2012.12.076
日期:2013.3
An asymmetric synthesis of both the stereoisomers (2a & 2b) of the structure 2 proposed for (9R,10S,7E)-6,9,10-trihydroxyoctadec-7-enoic acid, an immunostimulant oxylipin from the n-butanol extract of the corms of Dracontium loretense, has been accomplished. The key steps involved are using Jacobsen's hydrolytic kinetic resolution (HKR), Julia–Kocienski olefination, regioselective epoxide ring opening
为(9 R,10 S,7 E)-6,9,10-三羟基十八烷基-7-烯酸(一种来自正丁醇的免疫刺激性脂蛋白)建议的结构2的两种立体异构体(2a和2b)的不对称合成已经完成了德拉肯天竺葵的球茎的提取物。涉及的关键步骤是使用Jacobsen的水解动力学拆分(HKR),Julia-Kocienski烯化,区域选择性环氧化物开环和Wittig烯化。构型(9 R,10 S,7 E)-6,9,10-三羟基十八烷基-7-烯酸建立为2aNMR数据比较,HPLC分析和天然衍生的(9 R,10 S,7 E)-6,9,10-三羟基十八烷基-7-烯酸的[α] D值,以及与合成的非对映异构体2a和2b的比较。