Reactions with 5-aminopyrazoles. I. Synthesis of halogen-containing fused pyrazoles
作者:Hamdy A. Hammouda、Ahmed A. El-Barbary、Mohie A. F. Sharaf
DOI:10.1002/jhet.5570210402
日期:1984.7
5-Amino-3-phenylpyrazole (I) and 5-amino-4-bromo-3-phenylpyrazole (II) reacted with ethyl acetoacetate and acetylacetone to give various pyrazolo[1,5-a]pyrimidines IV-VI and with benzoins to give different fused pyrazoles, namely, imidazo[1,2-b]pyrazoles IX, pyrrolo[2,3-c]pyrazoles X and pyrazolo[4,3-b][1,4]oxazines XII. Diazotized II was coupled with active methylene-containing nitriles to afford
5-氨基-3-苯基吡唑(I)和5-氨基-4-溴-3-苯基吡唑(II)与乙酰乙酸乙酯和乙酰丙酮反应,生成各种吡唑并[1,5 - a ]嘧啶IV-VI和苯偶姻给出不同的稠合吡唑,即咪唑并[1,2- b ]吡唑IX,吡咯并[2,3- c ]吡唑X和吡唑并[4,3- b ] [1,4]恶嗪XII。重氮化的II与活性的含亚甲基的腈偶联,得到吡唑并[5,1- c ]-,作为-三嗪XIV。