Ruthenium-Catalyzed Oxidative C–H Alkenylations of Anilides and Benzamides in Water
作者:Lutz Ackermann、Lianhui Wang、Ratnakancana Wolfram、Alexander V. Lygin
DOI:10.1021/ol203251s
日期:2012.2.3
A cationic ruthenium(II) complex enabled efficient oxidative alkenylations of anilides in water as a green solvent and proved applicable to double C-H bond functionalizations of (hetero)aromatic amides with ample scope. Detailed studies provided strong support for a change of ruthenation mechanism in the two transformations, with an irreversible metalation as the key step in cross-dehydrogenative alkenylations of benzamides.
Cp∗Co(III)-catalyzed oxidative C–H alkenylation of benzamides with ethyl acrylate
The utility of Cp∗Co(III)-catalysts was expanded to oxidative C–C bond-forming reaction. In situ-generated Cp∗Co(III)-catalyst, rather than a preformed cationic Cp∗Co(III)-complex, was effective. Oxidative alkenylation of benzamides and acetanilide with ethyl acrylate proceeded with silver acetate as a stoichiometric oxidant, giving products in up to 93% yield.