Greener synthesis of 1,2,3-triazoles using a copper(<scp>i</scp>)-exchanged magnetically recoverable β-zeolite as catalyst
作者:Elizama R. Costa、Floyd C. D. Andrade、Danilo Yano de Albuquerque、Luanne E. M. Ferreira、Thiago M. Lima、Carolina G. S. Lima、Domingos S. A. Silva、Ernesto A. Urquieta-González、Márcio W. Paixão、Ricardo S. Schwab
DOI:10.1039/d0nj02473b
日期:——
Herein, we describe the preparation and thorough characterization of a novel magnetically recoverable copper(I)-exchanged β-zeolite and its use as an efficient catalyst for the synthesis of 1,2,3-triazoles via the one-pot three-component reaction of organic halides, terminal acetylenes, and sodium azide in water. The magnetically recoverable β-zeolite could be easily separated from the reaction mixture
A copper-catalyzed three-component reaction of methyl ketones, organic azides, and various one-carbon (C1) donors was developed that provides 4-acyl-1,2,3-triazoles in moderate to good yields. While DMF, DMA, TMEDA, or DMSO can serve as the C1 donor, best yields were obtained using DMF. The transformation is proposed to proceed via an oxidative C–H/C–H cross-dehydrogenative coupling followed by an
from readily-available aryl–alkyl ketones (or alcohols) and different organic azides. Moreover, the reaction used environmentallyfriendlydimethylcarbonate (DMC) as the solvent and air as the oxidant, and H2O was the only by-product, so it provides a green and practical synthetic method for 1,2,3-triazoles.