Greener and Expeditious Synthesis of 1,4-Disubstituted 1,2,3-Triazoles from Terminal Acetylenes and in situ Generated α-Azido Ketones
作者:Dalip Kumar、Gautam Patel、V. Reddy
DOI:10.1055/s-0028-1087556
日期:2009.2
A convenient and mild protocol for the one-pot regioselective synthesis of 1,4-disubstituted 1,2,3-triazoles in aqueous PEG 400 has been reported. The methodology involves the one-pot reaction ofa-bromo ketones, sodium azide, and terminal acetylenes catalyzed by Cu(I) in aqueous PEG 400 at room temperature. Prominent features of our approach are mild reaction conditions, use of readily available α-bromo
Polymer-Supported Azide and Copper(I): Green Reusable Reagent and Catalyst for Click Cyclization
作者:Jalal Albadi、Mosadegh Keshavarz
DOI:10.1080/00397911.2012.671434
日期:2013.8.3
polymer-supported copper(I) iodide catalyst and macroporous polymer-supported azide reagent were used to simplify the synthesis of 1,4-disubstituted-1H-1,2,3-triazoles from α-bromo ketones/amides/esters following green chemistry principles. This new one-pot protocol facilitates the workup of the reaction and provides the products in short times and excellent yields. Heterogeneous catalyst and reagent can be reused
A facile and regioselective synthesis of 1,4-disubstituted 1,2,3-triazoles using click chemistry
作者:Dalip Kumar、V. Buchi Reddy、Rajender S. Varma
DOI:10.1016/j.tetlet.2009.02.107
日期:2009.5
The reaction of α-tosyloxy ketones, sodium azide, and terminal alkynes in presence of copper(I) in aqueous polyethylene glycol afforded regioselectively 1,4-disubstituted 1,2,3-triazoles in good yield at ambient temperature. The one-pot exclusive formation of 1,4-disubstituted 1,2,3-triazoles involves in situ formation of α-azido ketones, followed by cycloaddition reaction with terminal alkyne. The
Copper iodide nanoparticles on poly(4-vinyl pyridine): A new and efficient catalyst for multicomponent click synthesis of 1,4-disubstituted-1,2,3-triazoles in water
Polymer supported nanoparticles of copper(I) iodide is reported as a new, efficient and recyclable catalyst for the regioselective multicomponent synthesis of 1,4-disubstituted-1H-12,3-triazoles from alpha-halo ketones, sodium azide and terminal alkynes in water. This catalyst can be recovered by simple filtration and recycled up to 8 consecutive runs without losing its efficiency. (C) 2012 Elsevier B.V. All rights reserved.