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Quinoxalin-2-one reacts with benzaldehyde phenylhydrazones in the presence of trifluoroacetic acid to afford products of nucleophilic substitution of hydrogens. The reactions of quinoxaline-2-one with indole-3-carbaldehyde phenylhydrazones give trifluoroacetyl derivatives of hydrazones with Z-configuration over C=N bond. [ABSTRACT FROM AUTHOR]

As the moistures were used phenyl-, 4'-aminophenil- and 4'-pyrydil radicals. Photophysical properties of 1,3,4-oxadiazoles are considered. Such properties are recorded using three different solvent (acetonitrile, ethanol, and water). Then titration by trifluoroacetic acid is carried out. The bigger change in UV-visible spectrum was observed for 4-aminophenyl-5-(pyridin-4-yl)-1,3,4-oxadiazole. [ABSTRACT FROM AUTHOR]

In the present report, derivatives of dihydroxyacridone containing fragments of dihydroquinazoline and quinoxalone were obtained. The proposed synthetic pathway is based on the interaction of 1-hydroxy-3-methoxy-10-methylacridone with quinazoline or 6-nitroquinoxalone using acid catalysis (methanesulfonic acid or trifluoroacetic acid). The reaction proceeds as a regioselective addition of C2 position of acridone to the C4 position of quinazoline or C3 position of quinoxalone. [ABSTRACT FROM AUTHOR]

The cyclization of ethyl 2-((2-oxo-5-phenylfuran-3(2H)-ylidene)amino)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate under the action of ethyl 2-cyanoacetate resulted in the of ethyl 2-amino-1-(3-(ethoxycarbonyl)-4,5,6,7-tetrahydrobenzo[b]thiophen-2-yl)-4-oxo-5-(2-oxo-2-phenylethylidene)-4,5-dihydro-1H-pyrrole-3-carboxylate. We studied the E/Z isomerization of ethyl 2-amino-1-(3-(ethoxycarbonyl)-4,5,6,7-tetrahydrobenzo[b]thiophen-2-yl)-4-oxo-5-(2-oxo-2-phenylethylidene)-4,5-dihydro-1H-pyrrole-3-carboxylate in the presence 10 mol% of trifluoroacetic acid. [ABSTRACT FROM AUTHOR]