DABCO/AcOH Jointly Accelerated Copper(I)-Catalysed Cycloaddition of Azides and Alkynes on Water at Room Temperature
作者:Hemant Chandak、Prashant Sarode、Sandeep Bahekar
DOI:10.1055/s-0036-1588590
日期:——
the synthesis of 1,4-disubstituted 1,2,3-triazoles from terminal alkynes and substituted azides has been achieved using the combination of CuSO4-ascorbate/1,4-diazabicyclo[2.2.2]octane/acetic acid. This expeditious protocol is applicable to aryl, alkyl, and sulfonyl azides. Acetic acid accelerates the protonation of cuprated triazole and thus avoids the possible side reactions. Devoid of acetic acid
Readily prepared copper nanoparticles were found to catalyse the 1,3-dipolar cycloaddition of azides and alkynes up to rates comparable to those of microwave chemistry. Both the preparation of the nanoparticles and the click reaction are carried out under mild conditions, in short reaction times and in the absence of any stabilising additive or ligand. A variety of 1,2,3-triazoles were prepared in
One-pot, efficient, and regioselective syntheses of 1,4-disubstituted 1,2,3-triazoles using aryldiazonium silica sulfates in water
作者:Amin Zarei
DOI:10.1016/j.tetlet.2012.07.081
日期:2012.9
A one-pot, efficient, and straightforward procedure for the copper-catalyzed synthesis of 1,4-disubstituted 1,2,3-triazoles is studied by in situ generation of aryl azides via the reaction of aryldiazonium silica sulfates and sodium azide, followed by coupling with a terminal alkyne. These reactions are carried out in water at room temperature without using any additional ligands. (C) 2012 Elsevier Ltd. All rights reserved.