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1.
The reaction of 2,3-dihydro-2,3-benzo[b]furandione with the triphenylphosphazines of diazo compounds leads to substituted
2-methylenehydrazono-2,3-dihydro-3-benzo[b]furanones, which are hydrolyzed in an acidic medium to the substituted methylenehydrazides
of o-hydroxyphenylglyoxalic acid and react with amines to form the products of addition at the activated CH=N bond of the
side chain or 2-hydrazono-2,3-dihydro-3-benzo[b]furanone respectively.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 817–822, June, 2007. 相似文献
2.
Kutkovaya N. V. Vyaznikova N. G. Zalesov V. V. 《Russian Journal of Organic Chemistry》2003,39(11):1644-1648
Ethyl 5-aryl-2-diazo-3,5-dioxopentanoates and 1,5-diaryl-2-diazopentane-1,3,5-triones are partially enolized in solutions. By O-methylation of enol forms of diazo esters with diazomethane ethyl 5-aryl-2-diazo-5-methoxy-3-oxopent-4-enoates were prepared. Concurrently with the O-methylation the diazo esters undergo heterocyclization into 3,5-disubstituted 4-hydroxypyrazoles which under the reaction condition suffer O- and N-methylation by excess diazomethane. 3,5-Diaroyl-4-hydroxypyrazoles were also obtained from diazopentanetriones but here triethylamine served as the cyclization reagent. 相似文献
3.
Ring cleavage in 4-methyl-5-phenyl-2,3-dihydrofuran-2,3-dione by the action of methanol and in 5-aryl-4-methyl-2,3-dihydrofuran-2,3-diones by the action of aniline and N-methylaniline results in formation of, respectively, methyl 3-methyl-4-phenyl-2,4-dioxobutanoate and 4-aryl-3-methyl-2,4-dioxobutananilides. The reaction mechanism was studied by 1H NMR spectroscopy. 相似文献
4.
Z. G. Aliev L. O. Atovmyan S. S. Kataev V. V. Zalesov 《Chemistry of Heterocyclic Compounds》2007,43(3):377-381
Reactions between 2-pyridylamides of Z-4-aryl-2-hydroxy-4-oxobut-2-enoic acids with diazomethane have been used to synthesize
3-(2-aryl-2-oxoethyl)-3-methoxy-2-oxo-2,3-dihydroimidazo[1,2-a]pyridines, which form hydrochlorides with hydrochloric acid.
The structure of the latter has been demonstrated by XRD for the hydrochloride of 3-methoxy-2-oxo-3-(2-phenyl-2-oxoethyl)-2,3-dihydroimidazo[1,2-a]pyridine.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 464–468, 2007. 相似文献
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Published data on the synthesis, structure, and chemical properties of N-substituted 2(3)-imino-2,3-dihydrofuran-3(2)-ones to 2002 are reviewed 相似文献
7.
N. V. Kutkovaya N. A. Pulina V. V. Zalesov 《Russian Journal of Organic Chemistry》2004,40(7):1037-1040
5-Aryl-2-diazo-1,3,5-pentanetriones undergo intramolecular cyclization by the action of triphenylphosphine to give triphenylphosphine oxide and substituted 6-aryl-3-acyl-4-hydroxypyridazines. 相似文献
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Treating 4-aryl-2,4-dioxobutanoic acids with aromatic amines, 4-aminoantipyrine, and benzophenone hydrazone furnished N-substituted 2-amino-4-aryl-4-oxo-2-butenoic acids that existed in solutions in enaminoketone and iminoketone forms. The acids obtained underwent in the presence of acetic anhydride cyclization into N-substituted 5-aryl-3-imino-3H-furan-2-ones. 相似文献