Ruthenium(II) oxidase catalysis by direct dioxygen‐coupled turnover enabled step‐economical oxidative CH alkenylation reactions at ambient pressure. Versatile ruthenium(II) biscarboxylate catalysts displayed ample substrate scope and proved applicable to weaklycoordinating and removable directing groups. The twofold CH functionalization strategy was characterized by exceedingly mild reaction conditions
Intermolecular CH acyloxylations of phenols with removable directing groups were accomplished with a versatile rutheniumcatalyst. Specifically, a cationicruthenium(II) complex, formed in situ, enabled the chemoselective CH oxygenations of a broad range of substrates. The catalyst proved tolerant of synthetically valuable functional groups, and the substrate scope included both (hetero)aromatic
Ruthenium(II)-Catalyzed CH Alkenylations of Phenols with Removable Directing Groups
作者:Wenbo Ma、Lutz Ackermann
DOI:10.1002/chem.201301988
日期:2013.10.4
Cationic ruthenium(II) complexes enabled oxidativealkenylations of phenols bearing easily cleavable directing groups. The optimized catalytic system allowed twofold CH bond activations with excellent chemo‐, site‐, and diastereoselectivities. The double CH functionalization process proceeded efficiently in an aerobic fashion under an atmosphere of ambient air. Detailed mechanistic studies were performed