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 ring expansion 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 ring expansion reaction proceeded via a three-step one-pot cascade pathway of aza-Michael-addition/ring-opening/iminium-cyclization.
当3-取代的吡咯并二氢吲哚在催化量的CuI存在下与缺电子的乙炔反应时,观察到了意外的扩环反应,生成了3-取代的8,9-二氢叠氮ep庚因二氢吲哚。环的扩环反应通过氮杂-迈克尔加成/开环/亚胺基环化的三步一锅级联途径进行。