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