Total Synthesis of Eupomatilones 1, 2, and 5 by Enantioselective [2,3]-Wittig Rearrangement
作者:Yoshimi Hirokawa、Maria Kitamura、Makoto Mizubayashi、Rie Nakatsuka、Yuya Kobori、Chiharu Kato、Yuki Kurata、Naoyoshi Maezaki
DOI:10.1002/ejoc.201201247
日期:2013.2
In this study, the asymmetric total synthesis of eupomatilones 1, 2, and 5 has been accomplished. These compounds are lignan congeners containing a biaryl system bearing an α-methylene γ-lactone. They were isolated from the Australian shrub Eupomatia bennettii. Two chiral centers were constructed enantioselectively by the asymmetric [2,3]-Wittig rearrangement of highly oxygenated biaryl compounds,
在这项研究中,euomatilones 1、2 和 5 的不对称全合成已经完成。这些化合物是含有带有α-亚甲基γ-内酯的联芳系统的木脂素同类物。它们是从澳大利亚灌木 Eupomatia bennettii 中分离出来的。使用双(恶唑啉)手性配体,通过高度氧化联芳化合物的不对称 [2,3]-Wittig 重排,对映选择性地构建了两个手性中心。使用 nBuLi 作为碱和醚作为共溶剂优化关键反应,将对映选择性提高到 88-91% ee。