and/or alkyllithium species reacted smoothly with aryl and/or benzyl ethers with cleavage of the inert C−O bond to afford cross‐coupled products, catalyzed by commercially available [Ni(cod)2] (cod=1,5‐cyclooctadiene) catalysts with N‐heterocyclic carbene (NHC) ligands. Furthermore, the couplingreaction between the aryllithium compounds and aryl ammonium salts proceeded under mild conditions with C−N
An ethericNegishicoupling: The first cross‐coupling reaction between aryl alkyl ethers and dianion‐type zincate reagents to afford biaryl compounds through selective cleavage of the ethericC(sp2)O bond was developed. Dianion‐type zincates showed excellent reactivity toward the aromatic ethersundermildconditions, with good functional group compatibility (see scheme).
Direct Application of Phenolic Salts to Nickel-Catalyzed Cross-Coupling Reactions with Aryl Grignard Reagents
作者:Da-Gang Yu、Bi-Jie Li、Shu-Fang Zheng、Bing-Tao Guan、Bi-Qing Wang、Zhang-Jie Shi
DOI:10.1002/anie.200907359
日期:2010.6.21
You're nickel'd pal! The first successful coupling reaction with the directapplication of naphtholates as electrophiles (see scheme, X=halide) improves both the step economy and atom economy of cross‐coupling reactions whilst decreasing the cost of preparing complex scaffolds from readily available phenol derivatives.