Copper nanoparticles on activated carbon have been found to effectively catalyze the multicomponent synthesis of 1,2,3-triazoles from different azide precursors, such as organic halides, diazonium salts, anilines and epoxides in water. The first one-pot transformation of an olefin into a triazole is also described. The catalyst is easy to prepare, very versatile and reusable at a low copper loading
An easy-to-prepare, reusable and versatile catalyst consisting of oxidised copper nanoparticles on activated carbon has been fully characterised and found to effectively promote the multicomponent synthesis of 1,2,3-triazoles from organic halides, diazonium salts, and aromatic amines in water at a low copper loading.
Visible‐Light‐Mediated Click Chemistry for Highly Regioselective Azide–Alkyne Cycloaddition by a Photoredox Electron‐Transfer Strategy
作者:Zheng‐Guang Wu、Xiang‐Ji Liao、Li Yuan、Yi Wang、You‐Xuan Zheng、Jing‐Lin Zuo、Yi Pan
DOI:10.1002/chem.202000252
日期:2020.5.4
Clickchemistry focuses on the development of highly selective reactions using simple precursors for the exquisite synthesis of molecules. Undisputedly, the CuI -catalyzed azide-alkynecycloaddition (CuAAC) is one of the most valuable examples of clickchemistry, but it suffers from some limitations as it requires additional reducing agents and ligands as well as cytotoxic copper. Here, we demonstrate
present methodology could be useful for the building up of multi-triazole libraries easily tunable with donor or attractor functional groups. A versatile one-pot synthesis of a series of mono-, bis- and tris-1,2,3-triazoles supported by commercially available hydroxybenzene scaffolds has been developed employing clickchemistry. The multicomponent copper(I)-catalyzed 1,3-dipolar cycloaddition of sodium azide
Various substituted aryl nitrile and 1,2,3-triazole derivatives were prepared by using carbon supported copper nanoparticles (C/Cu NPs) as a heterogeneous catalyst under ligand-free conditions, which provided good to excellent yields.