A simple route towards the synthesis of 1,4,5-trisubstituted 1,2,3-triazoles from primary amines and 1,3-dicarbonyl compounds under metal-free conditions
acetic acid-promoted approach that enables the synthesis of 1,4,5-trisubstituted 1,2,3-triazole derivatives has been achieved. This transformation employs readily available primary amines, 1,3-dicarbonyls and tosyl azide as the starting materials via a cycloaddition reaction under metal-free conditions. The reaction provides a simple access to fully substituted 1,2,3-triazoles from commercial substrates
Copper Acetate Catalyzed Regioselective Synthesis of Substituted 1,2,3-Triazoles: A Versatile Azide-Alkene Cycloaddition/Oxidation Approach
作者:Sandeep Rohilla、Shyam Sunder Patel、Nidhi Jain
DOI:10.1002/ejoc.201501301
日期:2016.2
A copperacetatecatalyzedoxidativecycloaddition reaction of benzyl and aryl azides with terminal and internal olefins that contain electron-withdrawing groups (COOR, CONH2, CN, CHO, COR) has been developed. The reaction employs air as the oxidant and does not require any base or additives to afford 1,4-disubstituted and 1,4,5-trisubstituted 1,2,3-triazoles in good to excellent yields with high regioselectivity
Lewis Base Catalyzed Aerobic Oxidative Intermolecular Azide-Zwitterion Cycloaddition
作者:Wenjun Li、Jian Wang
DOI:10.1002/anie.201408265
日期:2014.12.15
discovery of a novel aerobic oxidative intermolecular azide–zwitterion reaction catalyzed by an organocatalyst is presented. It is demonstrated that the merger of the Lewis base 1,8‐diazabicyclo[5.4.0]undec‐7‐ene and electron‐deficient olefins generates reactive zwitterion intermediates, which readily participate in cycloaddition reactions with an array of azides, thus providing facile entry to fully or
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.