Synthesis of functionalized H-pyrazolo[5,1-a]isoquinolines via sequential reactions of N′-(2-alkynylbenzylidene)hydrazides
作者:Zhiyuan Chen、Mingchao Su、Xingxin Yu、Jie Wu
DOI:10.1039/b914265g
日期:——
Diversity-oriented synthesis of functionalized H-pyrazolo[5,1-a]isoquinolines via sequential reactions of N′-(2-alkynylbenzylidene)hydrazide is described. Bromine-mediated electrophilic cyclization, Ag-catalyzed alkyne nucleophilic addition, and palladium-catalyzed cross-coupling reaction were involved in the transformation.
描述了通过N '-(2-炔基亚苄基)酰肼的顺序反应,以多样性为导向的功能化H-吡唑并[5,1- a ]异喹啉合成方法。溴介导的亲电环化,Ag催化的炔炔亲核加成和钯催化的交叉偶联反应均参与了转化。
Highly efficient electrophilic cyclization of N′-(2-alkynylbenzylidene)hydrazides
Electrophilic cyclization of N'-(2-alkynylbenzylidene)hydrazides with I-2, Br-2, or ICl under mild conditions is described. This reaction proceeds smoothly in dichloromethane at room temperature, which provides a useful method for the synthesis of functionalized isoquinolinium-2-yl amide. (C) 2008 Elsevier Ltd. All rights reserved.