Copper-Catalyzed Decarboxylative Cycloaddition of Propiolic Acids, Azides, and Arylboronic Acids: Construction of Fully Substituted 1,2,3-Triazoles
作者:Xiang-Xiang Wang、Yangchun Xin、Yi Li、Wen-Jin Xia、Bin Zhou、Rui-Rong Ye、Ya-Min Li
DOI:10.1021/acs.joc.9b03285
日期:2020.3.6
A copper-catalyzed decarboxylative cycloaddition of propiolic acids, azides, and arylboronicacids is described. The present reaction provides an efficient and convenient method for the synthesis of various fully substituted 1,2,3-triazoles from readily available starting materials. A possible mechanism is proposed.
Synergistic Effect of Copper and Ruthenium on Regioselectivity in the Alkyne–Azide Click Reaction of Internal Alkynes
作者:Sivaraj Ramasamy、Chittibabu Petha、Shankar Tendulkar、Prantik Maity、Martin D. Eastgate、Rajappa Vaidyanathan
DOI:10.1021/acs.oprd.8b00163
日期:2018.7.20
have been shown to improve the regioselectivity and rate of the Ru-catalyzed alkyne–azide click reaction of internalalkynes with azides. While Cu and Ru individually provide complementary regioselectivity in the case of terminal alkynes, the synergistic effect of these two species in situ significantly improves regiochemical outcomes in the case of internalalkynes. The substrate scope of these new
An Abnormal N-Heterocyclic Carbene-Copper(I) Complex in Click Chemistry
作者:Samaresh Chandra Sau、Sudipta Raha Roy、Tamal K. Sen、Dinesh Mullangi、Swadhin K. Mandal
DOI:10.1002/adsc.201300343
日期:2013.10.11
AbstractHerein we report the synthesis of a copper(I) chloro complex using an abnormal N‐heterocyclic carbene (aNHC) salt, 1,3‐bis(2,6‐diisopropylphenyl)‐2,4‐diphenylimidazolium. The CuCl(aNHC) complex efficiently catalyzed Huisgen 1,3‐dipolar cycloaddition reactions (click reactions) of azides with alkynes to give 1,4‐substituted 1,2,3‐triazoles in excellent yields at room temperature within short reaction time under solvent‐free conditions. The catalyst successfully activated benzyl azide and phenylacetylene under the low catalyst loading of 0.005 mol% resulting in a nearly quantitative yield of the product at room temperature with the high TON value of 19,800. The catalyst also exhibits high efficiency in the reaction between sterically hindered azides and alkynes under solvent‐free conditions at room temperature. Furthermore, a number of internal alkynes was successfully tested in this copper‐catalyzed cycloaddition reaction for synthesis of 4,5‐disubstituted triazoles.magnified image