Enantioselective Functionalization of Indoles and Pyrroles via an in Situ-Formed Spiro Intermediate
作者:Chun-Xiang Zhuo、Qing-Feng Wu、Qiang Zhao、Qing-Long Xu、Shu-Li You
DOI:10.1021/ja403535a
日期:2013.6.5
Herein we report a highly enantioselective synthesis of polycyclic indoles and pyrroles with up to 99% ee by an iridium catalyst system consisting of a commercially available iridium precursor and a readily accessible ligand. Investigation of the reaction mechanism led to the discovery of an unprecedented dearomatized spiro intermediate and its in situ migration phenomenon. The new reaction mode features
在此,我们报告了通过由市售的铱前体和易于获得的配体组成的铱催化剂系统,高度对映选择性合成多环吲哚和吡咯的 ee 高达 99%。对反应机理的研究导致发现了一种前所未有的脱芳构化螺环中间体及其原位迁移现象。新的反应模式的特点是将取代基从吲哚 C-3 位置切换到 C-2 位置(在吡咯的情况下从 C-2 位置切换到 C-3 位置)而不损失对映体纯度,提供了设计对映纯多环吲哚和吡咯的不对称结构的新概念。