Synthesis of some derivatives of imidazo[1,2-<i>a</i>]pyridine, pyrazolo[1,5-<i>b</i>]imidazole, and 4-(3<i>H</i>)quinazolinone from α-ketohydrazidoyl bromides
作者:Ahmad S. Shawali、M. Sami、S. Mourad Sherif、Cyril Párkányi
DOI:10.1002/jhet.5570170507
日期:1980.7
α-Aroyl-N-arylhydrazidoyl bromides 1 react with 2-aminopyridine in ethanol and give 2-aryl-3-arylazo-imidazo[1,2-α]pyridines 2 in 60-75% yield. The reaction of 1 with 3-phenyl-5-aminopyrazole in ethanol leads to 2,6-diaryl-3-arylazo-1H-pyrazolo[1,5-b]imidazoles 3 in almost quantitative yield. Also, 1 react with anthran-ilic acid in the presence of triethylamine giving 3-arylamino-2-aroyl-4-(3H)quinazolinones 4 in 80-85%
α-Aroyl- Ñ -arylhydrazidoyl溴化物1在乙醇中与2-氨基吡啶反应,得到2-芳基-3-芳基偶氮-咪唑并[1,2-α]吡啶化合物2在60-75%的产率。1与3-苯基-5-氨基吡唑在乙醇中的反应生成2,6-二芳基-3-芳基偶氮-1 H-吡唑并[1,5- b ]咪唑3几乎是定量的。同样,在三乙胺的存在下,1与蒽甲酸反应,以80-85%的收率得到3-芳基氨基-2-芳酰基-4-(3 H)喹唑啉酮4。根据产品的元素分析,电子吸收,红外光谱和核磁共振光谱对产品的结构进行分配和确认。