An efficient Cu-catalyzed cascade reaction involving N–O bond cleavage and C–C/C–N/N–N bond formations is developed to afford various 1,3- and 1,3,4-substituted pyrazoles.
Copper-catalyzed reactions of α,β-unsaturated <i>N</i>-tosylhydrazones with diaryliodonium salts to construct <i>N</i>-arylpyrazoles and diaryl sulfones
作者:Lian-Mei Chen、Chuang Zhou、Jing Li、Jun Li、Xiao-Qiang Guo、Tai-Ran Kang
DOI:10.1039/d2ob01338j
日期:——
Herein, an economical copper-catalyzed reaction of α,β-unsaturated N-tosylhydrazones with diaryliodoniumsalts to construct both N-arylpyrazoles and diaryl sulfones has been developed. Both the p-toluenesulfonyl anion and the 3-arylpyrazole intermediates were formed in situ from N-tosylhydrazones. Subsequently, the former reacted rapidly with diaryliodoniumsalts to give diaryl sulfones and aryl iodide