organophosphorus-catalyzed method for the synthesis of unsymmetrical hydrazines by cross-selective intermolecular N–N reductive coupling is reported. This method employs a small ring phosphacycle (phosphetane) catalyst together with hydrosilane as the terminal reductant to drive reductive coupling of nitroarenes and anilines with good chemoselectivity and functional group tolerance. Mechanistic investigations
报道了一种通过交叉选择性分子间 N-N 还原偶联合成不对称
肼的有机
磷催化方法。该方法采用小环
磷环(膦烷)催化剂和氢
硅烷作为末端还原剂来驱动硝基
芳烃和
苯胺的还原偶联,具有良好的
化学选择性和官能团耐受性。机理研究支持自动串联催化反应级联,其中有机
磷催化剂通过 P III /P V = O 循环驱动两个连续且机械上不同的还原事件,以提供目标 N-N 键。