Ruthenium-catalyzed cycloaddition of alkynes and organic azides
申请人:Fokin Valery
公开号:US08372986B2
公开(公告)日:2013-02-12
A convenient process for the regioselective synthesis of 1,5-disubstituted 1,2,3-triazoles and 1,4,5-trisubstituted 1,2,3-triazoles from organic azides and alkynes employs catalytic ruthenium.
A polymer-supported copper catalyst (Cu/HP20) is easily prepared in water and effectively catalyzed the Huisgen cycloaddition between azides and terminal alkynes.
Ruthenium-Catalyzed Cycloaddition of Alkynes and Organic Azides
作者:Li Zhang、Xinguo Chen、Peng Xue、Herman H. Y. Sun、Ian D. Williams、K. Barry Sharpless、Valery V. Fokin、Guochen Jia
DOI:10.1021/ja054114s
日期:2005.11.23
Cp*RuCl(PPh3)2 is an effective catalyst for the regioselective "fusion" of organic azides and terminal alkynes, producing 1,5-disubstituted 1,2,3-triazoles. Internal alkynes also participate in this catalysis, resulting in fully substituted 1,2,3-triazoles.
1,4-Disubstituted-1H-1,2,3-triazoles 1 can easily be distinguished from the isomeric 1,5-disubstituted-1H-1,2,3-triazoles 2 by simple one-dimensional C-13 NMR spectroscopy using gated decoupling. The C-5 signal of 1 appears at delta similar to 120 ppm, while the C-4 signal of 2 appears at delta similar to 133 ppm. Computational studies also predict the upfield shift of C-5 of 1 relative to C-4 in 2.
Synthesis of 1-alkyl-4(5)-hydroxymethyl-1,2,3-triazoles
作者:A. V. Maksikova、E. S. Serebryakova、L. G. Tikhonova、L. I. Vereshchagin