Asymmetric Diels–Alder Reaction of 2-Methyl-3-indolylmethanols via in Situ Generation of <i>o</i>-Quinodimethanes
作者:You-Cai Xiao、Qing-Qing Zhou、Lin Dong、Tian-Yu Liu、Ying-Chun Chen
DOI:10.1021/ol302853m
日期:2012.12.7
An asymmetric Diels–Alder reaction of 2-methyl-3-indolylmethanols and α,β-unsaturated aldehydes has been developed that relies on in situ generation of active indole-2,3-quinodimethane intermediates under mild acidic conditions and uses a secondary chiral amine as iminium activation catalyst. An array of highly enantioenriched tetrahydrocarbazoles have been efficiently produced in fair to good yields
已经开发了2-甲基-3-吲哚基甲醇和α,β-不饱和醛的不对称Diels-Alder反应,该反应依赖于在温和的酸性条件下原位生成活性吲哚-2,3-喹二甲烷中间体,并使用仲手性胺作为亚胺活化催化剂。一系列高对映体富集的四氢咔唑已被有效地生产,以公平至良好的产率。