Synthesis of 3-substituted 8,9-didehydroazepino[4,5-b]indolines via ring expansion reaction of pyrroloindolines
作者:Fu-Sheng Wang、Dan Zhang、Chen Kong、Yong Qin
DOI:10.1016/j.tetlet.2011.04.061
日期:2011.6
An unexpected ringexpansion reaction was observed to give the 3-substituted 8,9-didehydroazepinoindolines when 3-substituted pyrroloindolines reacted with electron-deficient acetylenes in the presence of catalytic amount of CuI. The ringexpansion reaction proceeded via a three-step one-pot cascade pathway of aza-Michael-addition/ring-opening/iminium-cyclization.