Regioselectivity-Switchable Hydroarylation of Styrenes
作者:Ke Gao、Naohiko Yoshikai
DOI:10.1021/ja108809u
日期:2011.1.26
Cobalt-phosphine and cobalt-carbene catalysts have been developed for the hydroarylation of styrenes via chelation-assisted C-H bond activation, to afford branched and linear addition products, respectively, in a highly regioselective fashion. Deuterium-labeling experiments suggested a mechanism involving reversible C-H bond cleavage and olefin insertion steps and reductive elimination as the rate-
Cobalt-catalyzed Branched-selective Addition of Aromatic Ketimines to Styrenes under Room-temperature Conditions
作者:Jinghua Dong、Pin-Sheng Lee、Naohiko Yoshikai
DOI:10.1246/cl.130508
日期:2013.10.5
An improved cobalt-based catalytic system has been developed for the branched-selective addition of aromatic ketimines to styrenes. With an appropriate combination of triarylphosphine and the Grignard reagent, the reaction takes place smoothly at room temperature to afford 1,1-diarylethane derivatives with high regioselectivity.