Aerobic Oxidative Cycloaddition of α-Chlorotosylhydrazones with Arylamines: General Chemoselective Construction of 1,4-Disubstituted and 1,5-Disubstituted 1,2,3-Triazoles under Metal-Free and Azide-Free Conditions
摘要:
A novel synthetic approach toward 1,4-disubstituted 1,2,3-triazoles and 1,5-disubstituted 1,2,3-triazoles by aerobic oxidative cycloaddition of alpha-chlorotosylhydrazone with primary aryl amine has been developed. Significantly, the reaction proceeds smoothly to afford 1,4-disubstituted 1,2,3-triazoles and 1,5-disubstituted 1,2,3-triazoles under catalyst-free, metal-free, azide-free, and peroxide-free conditions.
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.
An Organocatalytic Azide-Aldehyde [3+2] Cycloaddition: High-Yielding Regioselective Synthesis of 1,4-Disubstituted 1,2,3-Triazoles
作者:Dhevalapally B. Ramachary、Adluri B. Shashank、S. Karthik
DOI:10.1002/anie.201406721
日期:2014.9.22
An organocatalyticazide–aldehyde [3+2] cycloaddition (organo‐click) reaction of a variety of enolizable aldehydes is reported. The organo‐click reaction is characterized by a high rate and regioselectivity, mild reaction conditions, easily available substrates with simple operation, and excellent yields with a broad spectrum of substrates. It constitutes an alternative to the previously known CuAAC
Aqueous bile salt accelerated cascade synthesis of 1,2,3-triazoles from arylboronic acids
作者:Anirban Garg、Abdul Aziz Ali、Krishnaiah Damarla、Arvind Kumar、Diganta Sarma
DOI:10.1016/j.tetlet.2018.09.064
日期:2018.11
A facile, efficient and mild copper catalyzed strategy for cascade synthesis of various 1,4-disubstituted 1,2,3-triazoles from arylboronic acids, sodium azide and alkynes was developed by using aqueous bile salt NaDC solution as an accelerating medium. Low catalyst loading (only 1 mol% Cu source was sufficient for in situ generation of azide followed by azide–alkyne coupling), green solvent, use of
Catalytic activity of dithioic acid copper complexes in the alkyne–azide cycloaddition
作者:Bayardo E. Velasco、Gustavo López-Téllez、Nelly González-Rivas、Iván García-Orozco、Erick Cuevas-Yañez
DOI:10.1139/cjc-2012-0325
日期:2013.4
Diverse dithioicacid copper complexes exhibit a high catalytic activity in the copper-catalyzed alkyne–azide cycloaddition using several solvents under different temperatures, showing a high efficiency with only 0.005 mmol catalyst/mmol alkyne or less. A dithioicacid copper complex derived from acetophenone was selected and used as the catalyst in the preparation of a library of 1,4-disubstituted-1
Efficient synthesis of 1,4-disubstituted 1,2,3-triazoles in ionic liquid/water system
作者:Ya-Bin Zhao、Ze-Yi Yan、Yong-Min Liang
DOI:10.1016/j.tetlet.2006.01.004
日期:2006.3
A copper(I) catalyst in a mixture of the ionic liquid [bmim][BF4] and water, can effect three-component reaction of halides, sodium azide and alkynes to form 1,4-disubstituted 1,2,3-triazoles in good to high yields. The method is efficient and environmentally friendly.