Copper nanoparticles on activated carbon have been found to effectively catalyze the multicomponent synthesis of beta-hydroxy-1,2,3-triazoles from a variety of epoxides and alkynes in water. The catalyst is easy to prepare, reusable at a low copper loading (0.5 mol %), and exhibits higher catalytic activity than some commercially available copper sources. The regio- and stereochemistiy of the reaction has been revised and unequivocally established on the basis of X-ray crystallographic analyses. An NMR experiment has been implemented for the rapid and unmistakable determination of the regiochemistry of the process. Some mechanistic aspects of the reaction have been also undertaken which unveil the participation of copper(I) acetylides.
A robust and recyclable polyurea-encapsulated copper(<scp>i</scp>) chloride for one-pot ring-opening/Huisgen cycloaddition/CO<sub>2</sub> capture in water
The multicomponent ring-opening/Huisgen cycloaddition reactions combined with CO2 capture with polyurea-encapsulated copper salt as catalyst that in-situ formed from simple CuCl and soluble polyurea during the reaction were carried out...