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Condensation of 4-bromobenzaldehyde, urea, and 4-alkyl-substituted acetophenones gave substituted hexahydro-1H,8H-pyrimido(4,5- d )pyrimidin-2,7-diones or 1H-pyrimidin-2-ones, depending on the substituent on the acetophenone ring and the nature of the solvent ( i -PrOH, BuOH, AcOH). The...
The reaction of 8-aza-16-thiagona-1,3,5(10),13-tetraene-12,17-dienes with ethoxyimine in dimethyl sulfoxide yields the corresponding 12( E )-ethoxyimino derivatives. The physicochemical properties of these compounds were studied.
A method is proposed for the synthesis of 3-(3-acetyl-5-aryl-2,3-dihydro-1,3,4-oxadiazol-2-yl)chromones which consists of the conversion of 3-formylchromones to aroylhydrazones and their subsequent heterocyclization using acetic anhydride.
We have obtained 4-alkyl-6-amino-5-cyano-3-methyl(propyl, phenyl)-2H,4H-pyrano(2,3- c )pyrazoles by reaction of 4-alkylmethylene-3-substituted 5-pyrazolones with malononitrile or cyanothioacetamide. We have used X-ray diffraction to study the structure of...
2,2-Dialkyl-4-hydroxymethylisoindolinium chlorides, like benzisoindolinium salts, readily undergo intramolecular recyclization under conditions of aqueous alkaline decomposition, comprising fission of the isoindolinium ring and formation of a dihydrofuran ring leading to...
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
Using quantum-chemical calculations we have carried out an analysis of frontier molecular orbital interactions in the (2+3) cycloaddition reactions of C,C,N-triphenyl- and Z -C,N-diphenylnitrones with β- and α-substituted nitroethylenes. In all of the examples studied the orbital effects lead...
A method is presented for the synthesis of 3-(2-oxo-1,2-dihydro-3H-indol-3-ylidene)-1,4-dihydroquinoxalin-2-one and 2-(2-oxo-1,2-dihydro-3H-indol-3-ylidene)-2H-1,4-benzoxazin-3(4H)-one by the reaction of ethyl 2-oxoindoline-2-glyoxylate with o -aminophenol and o -phenylenediamine. Proposed...
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