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In the reaction of N,N-dialkyl-dichloromethaniminium chlorides 11 with 2-aminoacetophenones 12 , a general and simple route to heretofore unknown 5-aryl-substituted 2-(dialkylamino)-1,3-oxazolium salts 13 and 5-aryl-substituted 2-(dialkylamino)oxazoles 14 was found. From the 2-(dialkylamino)-1,3-oxazoles 14 , the corresponding oxazolium salts 13 were obtained after alkylation with (MeO)2SO2. The new oxazolium salts 13 were converted to 1-substituted 4-aryl-2-(dialkylamino)-1H-imidazoles 9 by treatment with NH4OAc. The possible use of these 1H-imidazoles as dye educts was explored. Analytical data, as well as AM1 calculations, reveal some remarkable differences between the structures of the neutral imidazoles 9 and their positively charged oxazolium precursors 13 . 相似文献
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The reaction of benzofuroxan 1 with sodium or potassium salts of formanilides 2 affords 2-aryl-2H-benzotriazole 1-oxides 3 in moderate to good yields. By heating the reactants in toluene or DMSO formal O/N exchange with elimination of alkali formate takes place. 相似文献
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Ethyl 3-alkyl-4-hydroxy-2-thioxothiazolidine-4-carboxylates were prepared in excellent yields from the reaction of corresponding primary amines with carbon disulfide and ethyl 3-bromo-2-oxopropanoate in the presence of anhydrous potassium phosphate in DMF at room temperature within 1 h. The structures of the highly functionalized products were corroborated spectroscopically (IR, ^1H NMR, ^13C NMR, EI-MS) and by elemental analyses. A plausible mechanism for such type of cyclization was proposed. 相似文献
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Shtaitz Ya. K. Savchuk M. I. Kopchuk D. S. Taniya O. S. Santra S. Zyryanov G. V. Suvorova A. I. Rusinov V. L. Chupakhin O. N. 《Russian Journal of Organic Chemistry》2020,56(3):548-551
Russian Journal of Organic Chemistry - Methyl 6-(6-aryl-1,2,4-triazin-3-yl)pyridine-2-carboxylates were synthesized in up to 70% yield by one-step condensation of substituted... 相似文献
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Catalytic hydrogenation of some 4-arylidene-1,3-(2H,4H)isoquinolinediones (1) afforded the corresponding 4-arylmethyl-1,3-(2H,4H)isoquinolinediones (2) , but reduction of 1 by sodium borohydride gave 4-arylmethyl-1(2H)isoquinolones (isocarbostyrils, 3). Compounds of type 1 studied had aryl substituents phenyl, 3,4-dimethoxyphenyl, 3,4-methyleneoxyphenyl and 2-furyl. In one example of sodium borohydride reduction of an N-methylisoquinolinedione derivative (1) the heterocylic ring was opened, and 2-(1-hydroxymethyl-2-phenylethenyl)-N-methylbenzamide (4) was obtained from 4-benzylidene-2-methyl-1,3-(2H,4H)isoquinolinedione. 相似文献
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A. B. Devekki A. N. Egor'kov I. B. Blanshtein A. V. Devekki G. S. Idlis 《Chemistry of Heterocyclic Compounds》1988,24(9):1066-1066
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, p. 1284, September, 1988. 相似文献
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Russian Journal of General Chemistry - By means of the reactions of ethyl 4-acetyl-5-bromomethylfuran-2-carboxylate with butanethiol, ethyl sulfanylacetate and sulfanylethanol the corresponding... 相似文献
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We describe a five-step synthesis of 2-(formylmethyl) - cyclopenten-3-one (1a) and its 1-methyl congener (1b) from 6-methylhept-5-ene-2-one by way of the respective 2-(3-methylbut-2-enyl)-cyclopenten-3-ones (5) and selective ozonolysis of these intermediates. 相似文献
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Alimi Z. Hatamjafari F. Shiroudi A. Pourshamsian K. Oliaey A. R. 《Russian Journal of Organic Chemistry》2021,57(4):631-637
Russian Journal of Organic Chemistry - A series of novel 2-(5-aryl-4H-1,2,4-triazol-3-yl)-1H-isoindole-1,3(2H)-diones were synthesized in three steps. In the first step, treatment of substituted... 相似文献
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Richard Pater 《Journal of heterocyclic chemistry》1971,8(5):699-702
Reaction of isatoic anhydride with benzamides is shown to produce 2-aryl-4(3H)quinazolinones. The quinazolinones carrying a 2-(o-hydroxyphenyl) group are obtained in high yields. 相似文献
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Sakram B. Ravi D. Ashok K. Rambabu S. Sonyanaik B. Kurumanna A. 《Russian Journal of General Chemistry》2018,88(4):780-788
Russian Journal of General Chemistry - The Buchwald–Hartwig amination reaction between 2-chloro-3-aryl-1,8-naphthyridines and 2-(4-aminophenyl)-1H-benzo[de]isoquinoline-1,3(2H)-dione in the... 相似文献
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The synthesis of a series of ethyl N-1-(hetero)aryl-5-hydroxy-1H-pyrazole-4-carboxylates by reaction of diethyl ethoxymethylenemalonate with the appropriate hydrazines is described. According to nmr-spectro-scopic investigations (1H- and 13C-nmr) the title compounds exist as 5-hydroxy tautomers in deuteriochlo-roform as well as in deuteriodimethyl sulfoxide solution. 相似文献