Asymmetric Total Synthesis of (−)-Plicatic Acid via a Highly Enantioselective and Diastereoselective Nucleophilic Epoxidation of Acyclic Trisubstitued Olefins
作者:Bing-Feng Sun、Ran Hong、Yan-Biao Kang、Li Deng
DOI:10.1021/ja9039407
日期:2009.8.5
The first total synthesis of (-)-plicatic acid has been achieved by a concise and enantioselective route. In this synthesis, a conceptually new strategy featuring an asymmetric epoxidation-intramolecular epoxy-ring-opening Friedel-Crafts reaction sequence was developed for the stereoselective construction of the 2,7'-cyclolignane skeleton bearing contiguous quaternary-quaternary-tertiary stereocenters
(-)-plicatic acid 的首次全合成是通过简洁的对映选择性路线实现的。在该合成中,开发了一种具有不对称环氧化-分子内环氧-开环 Friedel-Crafts 反应序列的概念性新策略,用于立体选择性构建带有连续四元-四元-叔立体中心的 2,7'-环木脂烷骨架。这一策略的实施是通过使用 TADOOH 开发用于 Seebach 环氧化的改进方案来实现的,该方案提供了前所未有的、高度对映选择性和非对映选择性环氧化,其中包括一系列 α-羰基-β-取代的丙烯酸酯 3。