Copper(0) Nanoparticles in Click Chemistry: Synthesis of 3,5-Disubstituted Isoxazoles
作者:T. M. Vishwanatha、Vommina V. Sureshbabu
DOI:10.1002/jhet.2065
日期:2015.11
An efficient procedure for the synthesis of 3,5‐disubstituted isoxazoles via [3 + 2] cycloaddition reaction of in situ generated nitrileoxides with acetylenes employing readily preparable copper(0) nanoparticles is described. A variety of in situ generated nitrileoxide and acetylenic substrates were engaged in the study and found to undergo cyclization in short duration affording respective isoxazoles
Copper(I)-Catalyzed Synthesis of Azoles. DFT Study Predicts Unprecedented Reactivity and Intermediates
作者:Fahmi Himo、Timothy Lovell、Robert Hilgraf、Vsevolod V. Rostovtsev、Louis Noodleman、K. Barry Sharpless、Valery V. Fokin
DOI:10.1021/ja0471525
日期:2005.1.1
Huisgen's 1,3-dipolar cycloadditions become nonconcerted when copper(l) acetylides react with azides and nitrile oxides, providing ready access to 1,4-disubstituted 1,2,3-triazoles and 3,4-disubstituted isoxazoles, respectively. The process is highly reliable and exhibits an unusually wide scope with respect to both components. Computational studies revealed a stepwise mechanism involving unprecedented metallacycle intermediates, which appear to be common for a variety of dipoles.