Pd-catalyzed cross-coupling reactions of halogenated 1-phenylpyrazol-3-ols and related triflates
作者:Eglė Arbačiauskienė、Gytė Vilkauskaitė、Gernot A. Eller、Wolfgang Holzer、Algirdas Šačkus
DOI:10.1016/j.tet.2009.07.017
日期:2009.9
1-Phenyl-1H-pyrazol-3-ol was used as a versatilesynthon for the preparation of various 1-phenyl-1H-pyrazole derivatives substituted at C-3 and C-4 of the pyrazole nucleus and at the phenyl ring para-position. Treatment of 1-phenyl-1H-pyrazol-3-ol with triflic anhydride in the presence of base gave 3-trifloyloxy pyrazole, while bromination and iodination yielded the corresponding halogenated derivatives
Pd-catalyzed Negishi coupling of pyrazole triflates with alkyl zinc halides
作者:Ting Zhang、Xiaodi Gao、Harold B. Wood
DOI:10.1016/j.tetlet.2010.11.037
日期:2011.1
A mild, functional group tolerant palladium-catalyzed Negishi coupling of pyrazole triflates and nonaflates with alkyl, benzyl, and aryl zinc halides has been developed. It allows quick access to 3-substituted pyrazole analogs at late stage via common synthetic intermediates.