共查询到20条相似文献,搜索用时 0 毫秒
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A. A. Layeva E. V. Nosova G. N. Lipunova T. V. Trashakhova V. N. Charushin 《Russian Chemical Bulletin》2007,56(9):1821-1827
5-Fluoroquinazoline-2,4-diones and their 2-thio analogs were obtained from 6-fluoroanthranilic acid. Two convenient routes
to 5-fluoroquinazolin-4-ones involved cyclocondensation of 6-fluoroanthranilamide with acid chlorides (anhydrides) or with
aromatic (heterocyclic) aldehydes. A method for the synthesis of 7-fluoroquinazolin-4-one from 2,4-difluorobenzoic acid was
proposed.
Dedicated to Academician G. A. Abakumov on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1758–1764, September, 2007. 相似文献
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Minoo Dabiri Peyman Salehi Mostafa Baghbanzadeh 《Monatshefte für Chemie / Chemical Monthly》2007,138(11):1191-1194
Summary. 2,3-Dihydroquinazolin-4(1H)-ones were efficiently synthesised by the reaction of isatoic anhydride, a primary amine or ammonium acetate, and different
aromatic aldehydes in 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim]BF4) without using any acidic catalyst. Also a bis-derivative of the title compound as a polyheterocyclic system was synthesised
successfully in high yield. 相似文献
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The one-pot synthesis of N-acetyl-2-aryl-1,2-dihydro-4H-3,1-benzoxazin-4-one derivatives from the condensation reaction of anthranilic acids with heteroaromatic aldehydes in the
presence of excess amount of acetic anhydride has been explored. The reactions proceed smoothly under ultrasound irradiation
and without catalyst at 35 − 40 °C to afford the title products in high yields. 相似文献
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Ahmad Shaabani Ebrahim Soleimani Maria Darvishi 《Monatshefte für Chemie / Chemical Monthly》2007,138(1):43-46
Summary. The three-component condensation of aldehyde, N,N′-dimethylbarbituric acid and alkyl or aryl isocyanide afforded the corresponding furo[2,3-d]pyrimidine-2,4(1H,3H)-diones in 1-butyl-3-methylimidazolium bromide as an ionic liquid in high yields at room temperature within several minutes. 相似文献
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Diacylation of fluoroalkyl-containing α-aminovinyl ketones with oxalyl chloride afforded 5-alkyl-4-polyfluoroacylpyrrole-2,3(1H)-diones.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2240–2242, October, 2004. 相似文献
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O. G. Khudina A. E. Ivanova Ya. V. Burgart M. I. Kodess V. I. Saloutin 《Russian Chemical Bulletin》2011,60(5):901-905
The alkylation of 4-polyfluoroalkylpyrimidin-2-ones with iodomethane, 4-bromobutyl acetate, and epichlorhydrin occurs regiospecifically
to form O-regioisomers. 相似文献
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A. D. Dubonosov V. P. Rybalkin Ya. Yu. Vorob’eva V. A. Bren’ V. I. Minkin S. M. Aldoshin V. V. Tkachev A. V. Tsukanov 《Russian Chemical Bulletin》2004,53(10):2248-2252
It was shown by electron absorption spectroscopy and X-ray diffraction analysis that steric strains in photochromic 2-(N-acyl-N-arylaminomethylene) benzo[b]thiophen-3(2H)-one molecules ortho-substituted in the N-phenyl ring increase the quantum yield of the N→O photoinduced rearrangement in accord with an increase in the steric constant of the ortho-substituent.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2151–2155, October, 2004. 相似文献
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Dmitry S. Goncharov Ivan V. Kulakov Alexander S. Fisyuk 《Chemistry of Heterocyclic Compounds》2017,53(12):1335-1339
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N. N. Smolyar 《Russian Journal of Organic Chemistry》2010,46(1):122-125
Hydrazinolysis of 3-nitropyridin-4(1H)-one and its N-methyl derivative leads to the formation of 1-(1H-pyrazol-3-yl)ethanone hydrazone whose structure was confirmed by independent synthesis from authentic 3-acetyl-1H-pyrazole
and comparison of the IR and 1H NMR spectra. Oxidation of 1-(1H-pyrazol-3- yl)ethanone hydrazone with potassium permanganate gave 1H-pyrazole-3-carboxylic
acid. 相似文献