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。
Influence of Substituent Groups on Nuclear Reactivity in Formation of Substituted Biphenyls through Reactions of Aromatic Diazo and Cognate Compounds with Aromatic Liquids. III. The Substitution of Nitrobenzene by the p-Anisyl Radical
作者:Osamu Simamura、Toshihiko Migita
DOI:10.1246/bcsj.27.228
日期:1954.4
The decomposition of N-nitroso-p-acetanisidide in nitrobenzene at room temperature yielded 4-methoxy-4′-nitrobiphenyl and 4-methoxy-2′-nitrobiphenyl in a ratio of 1: 1. 6. From the result of a similar experiment in a mixture of nitrobenzene and benzene, which compete for the p-anisyl radical produced from N-nitroso-p-acetanisidide, the relative reactivities of the ortho, meta and para positions of
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.
76. Nitrosoacylarylamines. Part II. The action of nitrous fumes on acylarylamines
作者:J. W. Haworth、D. H. Hey
DOI:10.1039/jr9400000361
日期:——
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.