A ruthenium-catalyzed oxidative coupling of substituted aromatic and heteroaromatic esters with alkenes in the presence of catalytic amounts of AgSbF6 and Cu(OAc)2 to provide highly substituted alkene derivatives in good to excellent yields under an open atmosphere is described.
Oxidative Alkenylation of Aromatic Esters by Ruthenium-Catalyzed Twofold C–H Bond Cleavages
作者:Karolina Graczyk、Wenbo Ma、Lutz Ackermann
DOI:10.1021/ol301759v
日期:2012.8.17
Cationic ruthenium(II) complexes enabled catalytic twofold C-H bond functionalizations with weakly coordinating aromatic esters in a highly chemo-, site- and diastereo-selective as well as site selective fashion. The oxidative Fujiwara-Moritani-type alkenylation provided step-economical access to diversely substituted styrenes and proved viable in an aerobic manner. Mechanistic studies were indicative of a reversible acetate-assisted cycloruthenation step.