Synthesis of benz[5,6]azepino[4,3-b]indoles by 1,7-electrocyclisation of azomethine ylides
摘要:
A new, general route to the benz[5,6]azepino[4,3-b]indole ring system has been developed via the 1.7-dipolar electrocyclisation reactions of azomethine ylides derived from easily available 3-formyl indole derivatives. The intermediacy of azomethine ylides vas shown by the trapping of the proposed alpha, beta: gamma, delta-conjugated dipole with N-phenylmaleimide. (C) 2004 Elsevier Ltd. All rights reserved.
Oxygenophilic Lewis Acid Promoted Synthesis of 2-Arylindoles from Anilines and Cyanoepoxides in Alcohol
作者:Chuangchuang Xu、Jiaxi Xu
DOI:10.1021/acs.joc.8b02203
日期:2018.12.7
A convenient synthetic method to indoles from anilines and cyanoepoxides was developed under the catalysis of BF3·OEt2 or AlCl3 in alcohols. The reaction involves a tandem reaction of the regiospecific ring-opening of cyanoepoxides with anilines, elimination of cyanide, intramolecular aromatic electrophilic substitution, and water elimination. The Lewis acid generated protic acid is an efficient catalyst