Regioselective Formation of α-Vinylpyrroles from the Ruthenium-Catalyzed Coupling Reaction of Pyrroles and Terminal Alkynes Involving C−H Bond Activation
作者:Ruili Gao、Chae S. Yi
DOI:10.1021/jo100269y
日期:2010.5.7
The cationic ruthenium catalyst Ru-3(CO)(12)/NH4PF6 was found to be highly effective for the intermolecular coupling reaction of pyrroles and terminal alkynes to give gem-selective alpha-vinylpyrroles. The carbon isotope effect on the alpha-pyrrole carbon and the Hammett correlation from a series of para-substituted N-arylpyrroles (rho=-0.90) indicate a rate-limiting C-C bond formation step of the coupling reaction.
Addition of pyrroles onto terminal alkynes catalyzed by a dinuclear ruthenium (II) complex
作者:Sze Tat Tan、Yew Chin Teo、Wai Yip Fan
DOI:10.1016/j.jorganchem.2012.02.017
日期:2012.6
alkynes has been catalyzed by a dinuclear rutheniumcomplex, Ru2(CO)4(PPh3)2Br4, resulting in the formation of geminal 2-vinylpyrroles in high yields under mild conditions. Further functionalization with pyrroles or alkynes to afford dipyrrolmethanes or 2,5-bis(vinyl)pyrroles via the vinyl functional group can readily be achieved. A mechanism involving cationic rutheniumcomplexes was proposed based