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
Anti-Markovnikov hydroarylation of styrenes catalyzed by an in situ generated ruthenium complex
作者:Rémi Martinez、Jean-Pierre Genet、Sylvain Darses
DOI:10.1039/b806121a
日期:——
An efficient and practical catalytic system for the anti-Markovnikov ruthenium-catalyzed hydroarylation of styrenes with acetophenone, allowing a straightforward access to bibenzyl backbones, is described for the first time: this process, involving regioselective C-H bond activation, is complementary to a Friedel-Crafts type reaction giving the branched adduct.
A very simple and efficient catalytic system for the hydroarylation of olefins by aromatic ketones and Michael acceptors using simple and inexpensive ruthenium trichloride as a ruthenium source is described. These very mild conditions (dioxane at 80 C) appeared to be highly compatible, tolerant, and selective toward various functional groups, and the ease of the protocol is highly convenient for synthetic purposes.