Copper catalysed domino decarboxylative cross coupling-cyclisation reactions: synthesis of 2-arylindoles
摘要:
The efficient synthesis of 2-arylindoles and 6H-isoindolo[2,1-a]indol-6-one through copper catalysed domino sp-sp(2) decarboxylative cross-coupling and subsequent cyclisation reactions of arylpropiolic acids with 2-iodotrifluoroacetanilide has been described. This methodology also demonstrates that indolo[1,2-c]quinazolin-6(5H)-one can be obtained with the elimination of trifluoromethyl anion. (C) 2012 Elsevier Ltd. All rights reserved.
A visible light‐induced photocatalytic intramolecular cyclization of styrylazides has been developed in the presence of the ruthenium complex Ru(bpy)3Cl2 (0.5 mol%) as photocatalyst at room temperature. The present photocatalytic strategy features operational simplicity as well as high functional group tolerance, and provides a facile access to various 2‐substituted N‐free indoles in good to excellent