An Easy Route to<i>N</i>,<i>N</i>-Diarylhydrazines by Cu-Catalyzed Arylation of Pyridine-2-carbaldehyde Hydrazones with Aryl Halides
作者:Wei Wu、Xin-Le Li、Xin-Heng Fan、Lian-Ming Yang
DOI:10.1002/ejoc.201201445
日期:2013.2
A copper-catalyzed C–N coupling reaction is described for the preparation of pyridine-2-carbaldehyde N,N-diarylhydrazones by the arylation of N-mono- or -non-substituted hydrazones with aryl bromides/iodides, and the subsequent conversion of the hydrazones into N,N-diarylhydrazines by a transimination process with an aqueous solution of H2NNH2. The reaction features the use of CuI as the catalyst without
描述了一种铜催化的 C-N 偶联反应,用于通过 N-单或非取代腙与芳基溴化物/碘化物的芳基化制备吡啶-2-甲醛 N,N-二芳基腙,以及随后的转化通过使用 H2NNH2 水溶液的转亚胺化过程将腙转化为 N,N-二芳基肼。该反应的特点是使用 CuI 作为催化剂,无需外部配体。这种方法为从简单、易于获得的前体合成结构多样的 N,N-二芳基肼提供了一种方便的替代方法。