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-
Highly Linear Selective Cobalt-Catalyzed Addition of Aryl Imines to Styrenes: Reversing Intrinsic Regioselectivity by Ligand Elaboration
作者:Wengang Xu、Naohiko Yoshikai
DOI:10.1002/anie.201408028
日期:2014.12.15
Highlylinearselective, imine‐directed hydroarylation of styrene has been achieved with cobalt‐based catalytic systems featuring bis(2,4‐dimethoxyphenyl)(phenyl)phosphine and either 2‐methoxypyridine or DBU as a ligand and a Lewis base additive, respectively, thus affording a variety of 1,2‐diarylethanes (bibenzyls) in good yields under mild reaction conditions. The triarylphosphine controls the regioselectivity
Ruthenium-catalysed ortho alkylation of hydroxyacetophenones; the functionalisation of ring C aromatic diterpenoids
作者:Paul W.R. Harris、Paul D. Woodgate
DOI:10.1016/s0022-328x(96)06697-1
日期:1997.3
Ortho C-H bond coupling of some 2-alkoxyacetophenones with olefins catalysed by ruthenium complexes results in a high yield of the ortho alkylated product, providing that a suitable protecting group is employed. No such protection was required for a para-alkoxy group; an activating effect was also observed. Bicyclic and tricyclic analogues react similarly.