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Silver Triflate and Palladium Acetate Co-catalyzed Reaction of N′-(2-Alkynylbenzylidene)hydrazide with N-Allyl Ynamide

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journal contribution
posted on 01.06.2012, 00:00 by Ping Huang, Zhiyuan Chen, Qin Yang, Yiyuan Peng
A silver triflate and palladium acetate co-catalyzed reaction of N′-(2-alkynylbenzylidene)hydrazide with N-allyl ynamide is described, which generates 2-amino-H-pyrazolo[5,1-a]isoquinolines in good to excellent yield. The transformation proceeds with high efficiency through 6-endo cyclization, [3 + 2] cycloaddition, 3,3-sigmatropic rearrangement, and aromatization.