Palladium-catalyzed oxidation of amine in air: an efficient approach to H-pyrazolo[5,1-a]-isoquinolines
摘要:
An efficient approach to H-pyrazolo[5,1-a]isoquinolines through a reaction of N'-(2-alkynylbenzylidene) hydrazide with amine in the presence of a cooperative catalysis under mild conditions is reported. The palladium-catalyzed oxidation of amine in air leading to the formation of enamine is the key step during the transformation. (C) 2013 Elsevier Ltd. All rights reserved.