A facile approach to polysubstituted pyrazoles from hydrazonyl chlorides and vinyl azides
作者:Hongbin Zou、Huajian Zhu、Jiaan Shao、Jianwei Wu、Wenteng Chen、Marc A. Giulianotti、Yongping Yu
DOI:10.1016/j.tet.2011.04.103
日期:2011.7
A novel and facile approach to polysubstituted pyrazoles from readily synthesized hydrazonyl chlorides and vinyl azides was developed. The reaction was regiospecific and proceeded under mild conditions in the presence of base. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of pyrazoles from 2-azidoacrylates and hydrazonyl chlorides
作者:Yao Li、Deng Hong、Ping Lu、Yanguang Wang
DOI:10.1016/j.tetlet.2011.05.147
日期:2011.8
A regioselective synthesis of 1,3,4,5-tetrasubstituted pyrazoles is established between 2-azidoacrylates and hydrazonylchlorides in the presence of triethylamine. The yields are moderate (43–73%) and a possible mechanism for this transformation is postulated.