Palladium‐Catalyzed Olefination of
<i>N</i>
‐Tosylhydrazones as
<i>β</i>
‐Diazo Phosphonate Precursors with Arylhalides
作者:Jing He、Yijiao Feng、Fang Yang、Bin Dai、Ping Liu
DOI:10.1002/ejoc.202000981
日期:2020.9.30
An efficient Pd‐catalyzedolefination of N‐tosylhydrazones as β‐diazophosphonateprecursors with aryl halides was described. A series of 2,2‐disubstituted vinylphosphonates and (2,2‐diphenylvinyl)diarylphosphine oxides were easily obtained in moderate to excellent yields.
β-Tosylhydrazono phosphonates are novel, bifunctional reagents which were used for a concise approach to a wide range of polysubstituted pyrazoles in a single operation from aromatic and aliphatic aldehydes.