Iodine-mediated C–N and N–N bond formation: a facile one-pot synthetic approach to 1,2,3-triazoles under metal-free and azide-free conditions
作者:Geeta Sai Mani、Kavitha Donthiboina、Siddiq Pasha Shaik、Nagula Shankaraiah、Ahmed Kamal
DOI:10.1039/c9ra06005g
日期:——
A novel strategy towards the synthesis of 1,4-disubstituted1,2,3-triazoles via C–N and N–N bond formation has been demonstrated under transition metal-free and azide-free conditions. These 1,2,3-triazoles were obtained in a regioselective manner from commercially available anilines, aryl alkenes/aryl alkynes and N-tosylhydrazines using I2 under O2 atmosphere. Broad substrate scope, milder reaction
Effect of temperature on triazole and bistriazole formation through copper-catalyzed alkyne–azide cycloaddition
作者:Jaime González、Víctor M. Pérez、David O. Jiménez、Germán Lopez-Valdez、David Corona、Erick Cuevas-Yañez
DOI:10.1016/j.tetlet.2011.05.002
日期:2011.7
Temperature is an important factor in the copper catalyzed alkyne azide cycloaddition under oxidative conditions. 1,2,3-Triazoles were obtained in high yields when several alkynes and azides were reacted at methanol reflux using catalytic amounts of both copper iodide and sodium hydroxide. On the other hand, bistriazoles were major products when reactions were performed at -35 degrees C using excess sodium hydroxide. (C) 2011 Elsevier Ltd. All rights reserved.