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.
Tandem Reactions of <i>N</i>′-(2-Alkynylbenzylidene)hydrazides with Silyl Enolates: A Facile Route to <i>H</i>-Pyrazolo[5,1-<i>a</i>]isoquinolines
作者:Xingxin Yu、Zhiyuan Chen、Xiaodi Yang、Jie Wu
DOI:10.1021/cc1000314
日期:2010.5.10
A silver triflate-catalyzed tandemreaction of N′-(2-alkynylbenzylidene)hydrazide with silyl enolate is described, which generates the unexpected H-pyrazolo[5,1-a]isoquinolines in good to excellent yields. Intramolecular cyclization, nucleophilic addition, condensation, and aromatization may be involved in the reaction process.
描述了N '-(2-炔基亚苄基)酰肼与烯丙基甲硅烷基酯的三氟甲磺酸银催化串联反应,可产生出人意料的H-吡唑并[5,1- a ]异喹啉,收率高至优异。反应过程中可能涉及分子内环化,亲核加成,缩合和芳构化。