Influence of the Formation of the Halogen Bond ArX- - -N on the Mechanism of Diketonate Ligated Copper-Catalyzed Amination of Aromatic Halides
作者:Guillaume Lefèvre、Grégory Franc、Carlo Adamo、Anny Jutand、Ilaria Ciofini
DOI:10.1021/om200952v
日期:2012.2.13
cross-coupling reactions of aryl halides PhX (X = I, Br, Cl) with cyclohexylamine catalyzed by CuI associated with a diketonate ligand (ket = 2-acetylcyclohexanoate) has been investigated via DFT. Phenyl halides which can be involved in halogen-bond formation (X = I, Br) with the anionic nitrogen of the intermediate [(ket)Cu-NHCy]− can undergo intramolecular oxidative addition, which is in competition
已通过DFT研究了卤代芳基PhX(X = I,Br,Cl)与CuI催化的与二酮配体(ket = 2-乙酰基环己酸酯)缔合的环己胺的交叉偶联反应机理。可以与中间体[(ket)Cu-NHCy] -的阴离子氮参与卤素键形成(X = I,Br)的卤化苯分子可以进行分子内氧化加成,这与传统的氧化加成竞争3中心的途径,而那些不能(X = Cl)的途径经历经典的氧化加成反应,从而导致常见的络合物(ket)Cu III Ph(NHCy)。后者参与更快的还原消除,从而导致PhNHCy。C 6 F 5 I,其中最强的C 6˚F 5 I- - -N卤键,生成阴离子Ç 6 ˚F 5 -在C-I键,因此不期望的C-N的交叉偶联产物通过取代,如实验证明。