Catalytic Enantioselective Dearomatization/Rearomatization of 2-Nitroindoles to Access 3-Indolyl-3′-Aryl-/Alkyloxindoles: Application in the Formal Synthesis of Cyclotryptamine Alkaloids
作者:Wei-Cheng Yuan、Xiao-Jian Zhou、Jian-Qiang Zhao、Yong-Zheng Chen、Yong You、Zhen-Hua Wang
DOI:10.1021/acs.orglett.0c02350
日期:2020.9.18
The first catalytic enantioselective dearomatization/rearomatization of 2-nitroindoles triggered by the Michael addition of 3-monosubstituted oxindoles was established. A wide range of 3-indolyl-3′-alkyloxindoles (up to 99% yield, 97% ee) and 3-indolyl-3′-aryloxindoles (up to 95% yield, 99% ee) were obtained by using an organocatalyst. This method provides an unprecedented strategy to access structurally
建立了由3-单取代的羟吲哚的迈克尔加成引发的2-硝基吲哚的第一催化对映选择性脱芳香化/再芳香化。通过使用有机催化剂,获得了各种各样的3-吲哚基-3'-烷基氧吲哚(产率高达99%,ee为97%)和3-吲哚基-3'-芳基羟吲哚(产率高达95%,ee为99%)。该方法提供了一种空前的策略,可访问带有空间拥挤的含三芳基全碳四元立体中心的结构多样的3,3'-二取代的羟吲哚。通过环色胺生物碱的正式合成,验证了该方法的实用性。