A Metal-Free, Aqueous and General Route to 1,5-Disubstituted-1,2,3-triazoles: ‘Reversed Regioisomeric’ 1,3-Dipolar Cycloaddition of Azides and Vinyl Sulfones
A general route to 1,5-disubstituted 1,2,3-triazoles with alkyl/alkyl, alkyl/aryl, aryl/aryl combinations: a metal-free, regioselective, one-pot three component approach
作者:Santu Dey、Tanmaya Pathak
DOI:10.1039/c3ra47062h
日期:——
An experimentally simple one-pot reaction, affording 1,5-disubstituted 1H-1,2,3-triazoles in good to excellent yields by combining vinyl sulfones, sodium azide and alkyl bromides, -tosylates, -mesylates or aryl amines, -iodides is reported. The organic azides, generated in situ react with vinyl sulfones in a regioselective fashion in the absence of metal ions. Unlike many of the recently reported strategies, this method is capable of generating alkyl/alkyl, alkyl/aryl and aryl/aryl containing 1,5-disubstituted 1,2,3-triazoles under simple reaction conditions.
Light‐Triggered Nickel‐Catalyzed Azide−Alkyne Cycloaddition for the Preparation of 1,5‐Disubstituted 1,2,3‐Triazoles
作者:Baptiste Abadie、Axel Almansa、Ouchan He、Stéphane Massip、Florian Molton、Carole Duboc、Jean‐Marc Vincent
DOI:10.1002/adsc.202201026
日期:2022.12.20
When irradiated by UVA, a Ni(II) precatalyst integrating a benzophenone chromophore in its structure catalyzes the regioselective cycloaddition of alkynes and azides to produce 1,5-disubsituted 1,2,3-triazoles with 1,5:1,4 regioisomer ratios ranging from 1.7:1 to >20:1. Speciation and reactivity studies revealed that the reaction most likely proceeds through a Ni(I)/Ni(III) catalytic cycle.