Cu-Catalyzed Aerobic Oxidative N–N Coupling of Carbazoles and Diarylamines Including Selective Cross-Coupling
作者:Michael C. Ryan、Joseph R. Martinelli、Shannon S. Stahl
DOI:10.1021/jacs.8b05245
日期:2018.7.25
diarylamines to the corresponding N-N coupled bicarbazoles and tetraarylhydrazines. The reactions proceed under mild conditions (1 atm O2, 60-80 °C) with a catalyst composed of CuBr·dimethylsulfide and N, N-dimethylaminopyridine. Reactions between carbazole and diarylamines show unusually selective cross-coupling, even with a 1:1 ratio of the two substrates. This behavior was found to arise from reversible
已经确定了一种铜催化方法,用于将咔唑和二芳基胺有氧氧化二聚成相应的 NN 偶联联咔唑和四芳基肼。该反应在温和条件(1 atm O2,60-80 °C)下进行,催化剂由 CuBr·二甲基硫醚和 N,N-二甲基氨基吡啶组成。咔唑和二芳基胺之间的反应显示出异常选择性的交叉偶联,即使两种底物的比例为 1:1。发现这种行为是由四芳基肼的可逆形成引起的。该物质的形成在动力学上是有利的,但反应条件下 NN 键的断裂会导致热力学上有利的交叉偶联产物的选择性形成。