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