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.