Continuous-flow azide–alkyne cycloadditions with an effective bimetallic catalyst and a simple scavenger system
作者:Sándor B. Ötvös、Gábor Hatoss、Ádám Georgiádes、Szabolcs Kovács、István M. Mándity、Zoltán Novák、Ferenc Fülöp
DOI:10.1039/c4ra07954j
日期:——
A continuous-flow technique was utilized for azide–alkyne cycloadditions catalyzed by copper on iron bimetallic system. An iron powder unit was used as a readily available copper scavenger, which turned into an in situ generated copper catalyst after several hours of continuous operation.
Highly active copper-catalysts for azide-alkynecycloaddition
作者:Zsombor Gonda、Zoltán Novák
DOI:10.1039/b920790m
日期:——
Bis-triphenylphosphano complexes of copper(I)-carboxylates serve as efficient catalysts for azide-alkyne cycloaddition. The triazole formation takes place straightforwardly at ambient temperature providing a wide variety of products with good yields in the presence of 0.005–0.05% catalyst.
homogeneous copper complexes. Iron not only behaves as support for copper, but acts as a redox scavenger, and reduces the copper contamination of the organic product. Dipolar cycloaddition of terminal alkynes and azides catalyzed by the Cu/Fe bimetallic system is reported. In the presence of a readily accessible nanosized copper source, the cycloaddition reaction can be easily achieved at ambient temperature
Cu2O nanoparticles supported on hydrogentrititanatenanotubes (Cu2O/HTNT) catalysts have been efficiently catalyzed the multicomponent synthesis of 1,2,3‐triazoles in water at room temperature from different azide precursors, for example organic halides, sulfonates and anilines. The catalysts were synthesized by hydrothermal & wet‐impregnation methods and was characterized by HR‐TEM, EDS, XRD, XPS
RuH<sub>2</sub>(CO)(PPh<sub>3</sub>)<sub>3</sub> Catalyzed Selective Formation of 1,4-Disubstituted Triazoles from Cycloaddition of Alkynes and Organic Azides
作者:Pei Nian Liu、Hai Xiao Siyang、Li Zhang、Sunny Kai San Tse、Guochen Jia
DOI:10.1021/jo3008572
日期:2012.7.6
The ruthenium hydride complex RuH2(CO)(PPh3)(3) was found to be an effective catalyst for the cycloaddition reactions of terminal alkynes and azides. In the presence of RuH2(CO)(PPh3)(3), various azides reacted with a range of terminal alkynes to produce 1,4-disubstituted 1,2,3-triazoles with 100% selectivity and moderate to excellent yields.