Synthesis of substituted benzimidazo[2,1-a]isoquinolines and its condensed analogues using Pd(0)-catalyzed cyclization/C–H activation
摘要:
An efficient route for the synthesis of benzimidazo[2,1-a]isoquinolines and its condensed analogues has been developed via the palladium-catalyzed cyclization/C-H activation of N-allyl and N-methallyl derivatives of benzimidazoles. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of aryl ring-fused benzimidazolequinones using 6-exo-trig radical cyclizations
摘要:
The preparation of alicyclic ring-fused tetracyclic and pentacyclic benzimidazoles containing one and two fused aryl rings, respectively, is achieved conveniently in three steps, including Bu3SnH-mediated 6-exo-trig cyclization of sigma-aryl radicals generated from 1-allyl-2-(omega-bromoaryl)benzimidazoles. Inclusion Of 4,7-dimethoxy substituents on the radical precursors allows access to aryl ring-fused benzimidazolequitiones, a Unique family of potential bioreductive anti-cancer agents. (C) 2009 Elsevier Ltd. All rights reserved.