Cobalt-Catalyzed, Imine-Directed Olefin Hydroarylation under Grignard-Free Conditions
作者:Wengang Xu、Jie Hui Pek、Naohiko Yoshikai
DOI:10.1002/adsc.201600403
日期:2016.7.28
We report here that a cobalt catalyst generated from a cobalt(II) salt and a ligand using magnesium metal is capable of promoting hydroarylation reactions through chelation‐assisted C−H activation. With the appropriate choice of the ligand and other reaction conditions, ketimine‐ or aldimine‐directed branched selective hydroarylations of styrenes and ketimine‐directed hydroarylations of vinylsilane
Aldimine-Directed Branched-Selective Hydroarylation of Styrenes
作者:Pin-Sheng Lee、Naohiko Yoshikai
DOI:10.1002/anie.201207958
日期:2013.1.21
Branching out: A simple and inexpensive cobalt/triarylphosphine catalyst promotes aldimine‐directed hydroarylation of styrene with high branched regioselectivity to afford 1,1‐diarylethane derivatives in good yields under mild reaction conditions. The ortho‐formyl group in the hydroarylation products is amenable to dehydrative cyclization, to give fused polycyclic aromatic hydrocarbons, as well as