Synthesis, Characterization, and Reactivity of Arylpalladium Cyanoalkyl Complexes: Selection of Catalysts for the α-Arylation of Nitriles
作者:Darcy A. Culkin、John F. Hartwig
DOI:10.1021/ja026584h
日期:2002.8.1
reactivity of arylpalladium cyanoalkyl complexes. Complexes of 1,2-bis(diphenylphosphino)benzene (DPPBz), 1,1‘-bis(di-i-propylphosphino)ferrocene (DiPrPF), racemic-2,2‘-bis(diphenylphosphino)-1,1‘-binaphthyl (BINAP), and diphenylethylphosphine (PPh2Et) were prepared. Coordination to palladium through the α-carbon was observed for DPPBz-ligated complexes and for complexes of primary and benzylic nitrile anions
通过探索芳基钯氰基烷基配合物的结构和反应性,开发了一种新的偶联过程,即钯催化的腈的 α-芳基化。1,2-双(二苯基膦基)苯 (DPPBz)、1,1'-双(二-异丙基膦基)二茂铁 (DiPrPF)、外消旋-2,2'-双(二苯基膦基)-1,1'-的配合物制备联萘 (BINAP) 和二苯乙基膦 (PPh2Et)。对于 DPPBz 连接的复合物以及伯腈和苄基腈阴离子的复合物,观察到通过 α-碳与钯的配位。然而,当复合物被 DiPrPF 连接时,异丁腈的阴离子通过氰基氮与钯配位。当由 PPh2Et 连接的钯生成时,异丁腈阴离子取代膦配体形成 C,N 桥接二聚体。这些结果表明,在没有空间位阻效应的情况下,腈阴离子优先通过碳原子与钯配位。芳基钯氰基烷基配合物的热解导致还原消除...