An Improved Synthesis of Pyrazolines from Aryl Azides and Acrylic Esters
作者:J. S. Yadav、B. V. Subba Reddy、V. Geetha
DOI:10.1055/s-2002-20482
日期:——
Substituted pyrazoline derivatives are synthesized in high yields through the cycloaddition reactions of azides with acrylates under Baylis-Hillman reaction conditions. Improved yields and enhanced rates are obtained using DABCO as the base.
Cycloadduct formation of α,β-unsaturated esters with azides catalyzed by NHC systems
作者:Huijun Yuan、Hua Gao、Kun Liu、Zhantao Liu、Jian Wang、Wenjun Li
DOI:10.1039/c7ob02469j
日期:——
NHC-catalyzed cycloadduct formation of α,β-unsaturatedesters with azides has been developed. This strategy could generate 1,2,3-triazoles and dihydropyrazoles with high yields and regioselectivities in the presence of an N-heterocyclic carbene catalyst. The broad substrate scope and mechanistic survey of this process are also presented.