The first example of rare earth metal-catalyzed cycloaddition of terminal alkynes to azides resulting in the formation of 1,5-disubstituted 1,2,3-triazoles is described. Preliminary studies revealed that the present cycloaddition shows unprecedented mechanistic features involving a tandem anionic cascade cyclization and anti-addition across the CC triple bond.
Ruthenium-Catalyzed Cycloaddition of Aryl Azides and Alkynes
作者:Lars Kyhn Rasmussen、Brant C. Boren、Valery V. Fokin
DOI:10.1021/ol701912s
日期:2007.12.1
The formation of 1,5-disubstituted 1,2,3-triazoles from arylazides and alkynes was readily accomplished using [Cp*RuCl]4 catalyst in dimethylformamide. It was also demonstrated that the reaction provided higher yields, cleaner product, and shorter reaction times when carried out under microwave irradiation.