Convenient synthesis of some new substituted pyrazolyl-1,3,4-oxadiazoles and pyrazolyl-1,2,4-triazoles
作者:Yehya M. Elkholy、Korany A. Ali、Ahmad M. Farag
DOI:10.1002/jhet.5570430508
日期:2006.9
A simple and versatile method for the synthesis of pyrazol-3-yl-1,3,4-oxadiazole, pyrazol-3-yl-1,2,4-triazole, (1,5-diphenylpyrazol-3-yl)-(3,5-dimethyl-1-carbonyl)pyrazole and (1,5-diphenylpyrazol-3-yl)-(5-hydroxy-3-metheyl-1-carbonyl)pyrazole derivatives from 1,5-diphenylpyrazole-3-carboxylic acid hydrazide has been developed.
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。
Reactions of Hydrazonoyl Halides 54: Synthesis and Reactivity of 3-aza-2-bromo-1-(3-oxo benzo[<i>f</i>]chromen-2-yl-3-(arylamino)prop-2-en-1-one
作者:Abdou O. Abdelhamid、Hassen M. Abdelaziz
DOI:10.1080/10426500701521548
日期:2007.10.18
2-(5-imino-4-aryl-4,5-dihydro-[1,3,4]-thiadiazole-2-(carbonyl)benzo[f]chro-men-2-one, 2-(2-amino-5-arylazothiazol-4-yl)benzo[f]chromen-3-one and ethyl 6-methyl-3oxo-benzo [f]chromen-2-yl)-1,4-dihydro-[1,2,4]triazolo[4,3-a]pyrimidine-5-carboxylate were synthesized from hydrazonoyl bromides. Structures of the newly synthesized compounds were established by elemental analysis, spectral data and alternative synthesis route whenever possible.
Studies With Pyrazol-3-Carboxylic Acid Hydrazide: The Synthesis of New Pyrazolyloxadiazole and Pyrazolyltriazole Derivatives
作者:Yehya M. Elkholy、Korany A. Ali、Ahmad M. Farag
DOI:10.1080/10426500600605731
日期:2006.9.1
A simple and versatile method for the synthesis of pyrazol-3-yl-1,3,4-oxadiazole, pyrazol-3-yl-1,2,4-triazole, (1,5-diphenylpyrazol-3-yl)-(3,5-dimethyl-1-carbonyl)pyrazole, and (1,5-diphenylpyrazol-3-yl)-(5-hydroxy-3-metheyl-1-carbonyl)pyrazole derivatives from 1,5-diphenylpyrazole-3-carboxylic acid hydrazide has been developed.
Conversion of N-Aromatic Amides to O-Aromatic Esters
作者:Daniel T. Glatzhofer、Raymond R. Roy、Kimberly N. Cossey
DOI:10.1021/ol026051d
日期:2002.7.1
[GRAPHICS]N-Aromatic secondary amides can be transformed into O-aromatic esters in high yield via N-nitrosamide intermediates. The amides can be generated in situ from the corresponding aromatic amines or nitro compounds, and phenols can easily be made from the esters. The reaction can be modified by addition of methyl methacrylate or toluene at 0 degreesC to give polymerization or deamination, respectively. The rearrangement mechanism may involve radical formation and recombination.