An Asymmetric Synthesis of (+)-Isostrychnine Based on Catalytic Asymmetric Tandem Double Michael Addition
作者:Pengyan Wang、Junhan Chen、Weigang He、Jiacheng Song、Hengqian Song、Hongbo Wei、Weiqing Xie
DOI:10.1021/acs.orglett.1c01828
日期:2021.7.16
Herein, a concise asymmetric synthesis of (+)-isostrychnine is achieved in nine longest-linear steps with a 16% overall yield. The key features of this synthesis include the catalytic asymmetric tandem double Michael addition of a tryptamine-derived oxindole to an alkynone to facilely forge the A/B/C ring framework, a one-pot intramolecular dehydrative condensation/lactamization reaction to efficiently
在此,(+)-异马钱子碱的简洁不对称合成通过 9 个最长的线性步骤实现,总产率为 16%。该合成的主要特征包括色胺衍生的羟吲哚与炔酮的催化不对称串联双迈克尔加成以轻松形成 A/B/C 环骨架,一锅分子内脱水缩合/内酰胺化反应以有效建立 E /G 环系统和烯丙基二氮烯重排以引入关键烯烃,用于随后的分子内 Heck 反应。