Organocatalytic Asymmetric Arylative Dearomatization of 2,3-Disubstituted Indoles Enabled by Tandem Reactions
作者:Yu-Chen Zhang、Jia-Jia Zhao、Fei Jiang、Si-Bing Sun、Feng Shi
DOI:10.1002/anie.201408551
日期:2014.12.8
The organocatalytic asymmetric arylative dearomatization of indoles was achieved through two tandem approaches involving 2,3‐disubstituted indoles and quinone imine ketals. One approach utilized the enantioselective cascade 1,4 addition/alcohol elimination reaction, the other employed the one‐pot tandem arylative dearomatization/transfer hydrogenation sequence. In both cases, enantiomerically pure
吲哚的有机催化不对称芳基脱芳香化反应是通过涉及2,3-二取代的吲哚和醌亚胺缩酮的两种串联方法实现的。一种方法利用对映选择性级联1,4加成/消除醇的反应,另一种方法采用单锅串联芳基化脱芳香化/转移氢化序列。在这两种情况下,均以高收率和出色的立体选择性(所有dr> 95:5,最高99%ee)生成带有全碳四元立体异构中心的对映异构体纯的吲哚衍生物 。