I2/TBPB Mediated Oxidative Reaction of N-Tosylhydrazones with Anilines: Practical Construction of 1,4-Disubstituted 1,2,3-Triazoles under Metal-Free and Azide-Free Conditions
摘要:
An efficient I-2 (20 mol %)/TBPB mediated oxidative formal [4 + 1] cycloaddition of N-tosylhydrazones with anilines via C-N/N-N bond formation and S-N cleavage has been developed. This protocol represents a simple, general, and efficient approach for the construction of 1,2,3-triazoles under metal-free and azide-free conditions by utilizing a catalytic amount of I-2.
Magnetically Recoverable CuFe<sub>2</sub>O<sub>4</sub>Nanoparticles: Catalyzed Synthesis of Aryl Azides and 1,4-Diaryl-1,2,3-triazoles from Boronic Acids in Water
Magneticallyrecoverable and reusable CuFe2O4 nanoparticles are shown to be highly efficient catalysts for the one-pot synthesis of biologically important 1,4-diaryl-1,2,3-triazoles starting fromboronicacids, sodium azide, and acetylenes. The use of aqueous reaction medium at room temperature, the low cost and facile recovery of the catalyst by application of an external magnetic field, and consistently
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.