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.
Heterogeneous Copper Catalyst for the Cycloaddition of Azides and Alkynes without Additives under Ambient Conditions
作者:In Soo Park、Min Serk Kwon、Youngkwon Kim、Jae Sung Lee、Jaiwook Park
DOI:10.1021/ol702790w
日期:2008.2.1
A new copper catalyst was developed by immobilizing copper nanoparticles in aluminum oxyhydoxide fiber. The catalyst showed high catalytic activity for the (3+2) Huisgencycloaddition of nonactivated alkynes as well as activated ones with various azides at room temperature. The catalyst was recycled five times without significant loss of activity.
Conventional and microwave assisted synthesis of 1,4-disubstituted 1,2,3-triazoles from Huisgen cycloaddition
作者:Juan Ignacio Sarmiento-Sanchez、Adrian Ochoa-Teran、Ignacio A. Rivero
DOI:10.3998/ark.5550190.0012.913
日期:——
In this paper the synthesis of a library of new 1,4-disubstituted1,2,3-triazoles 1, with a variety of additional functional groups on its structure, from an in situ generated benzyl azide 2 and different alkynes and dialkynes 3 is reported. Optimal experimental conditions were established for the conventional click chemistry and for the microwave-assisted synthesis of these 1,2,3triazoles. Comparing
Readily prepared copper nanoparticles were found to catalyse the 1,3-dipolar cycloaddition of azides and alkynes up to rates comparable to those of microwave chemistry. Both the preparation of the nanoparticles and the click reaction are carried out under mild conditions, in short reaction times and in the absence of any stabilising additive or ligand. A variety of 1,2,3-triazoles were prepared in