Synthesis of 4-Arylpyrazoles via PdCl2(dppf)-Catalyzed Cross Coupling Reaction with Grignard Reagents
作者:Hayato Ichikawa、Yuuki Ohno、Yoshihide Usami、Masao Arimoto
DOI:10.3987/com-06-10863
日期:——
4-Aryl-1-tritylpyrazoles were prepared from the cross coupling reaction of aryl Grignard reagents with 4-bromo-1-tritylpyrazoles in the presence of 0.2 mo1% PdCl2(dppf) as catalyst. To deprotect the trityl group, 4-phenyl-1-tritylpyrazole was reacted with TFA to produce 4-arylpyrazole in quantitative yield.