The reaction of tryptamine with aromatic aldehydes and 4-chlorobenzoylpyruvic acid methyl ester led to the formation of 5-aryl-4-[hydroxy-(4-chlorophenyl)methylene]-1-[2-(1H-indol-3-yl)ethyl]pyrrolidine-2,3-diones. The resulting compounds were tested for antimicrobial activity.

The reactions of tryptamine with aromatic aldehyde and methyl benzoylpyruvate at room temperature leads to the formation of 5-aryl-4-[hydroxy(phenyl)Methylene]-1-[2-(1H-indol-3-yl)ethyl]pyrrolidine-2,3-diones.

5-Aryl-4-acyl-3-hydroxy-1-(2-hydroxyethyl)-3-pyrrolin-2-ones were synthesized using the reaction of ethanolamine with a mixture of aromatic aldehyde and methyl acylpyruvates. The antibacterial activity of the synthesized compounds was studied.

Methyl esters of 5-aroyl-6-aryl-2-oxo-1,2,3,6-tetrahydropyrimidine-4-carboxylic acids were synthesized from three component mixtures of methyl esters of aroylpyruvic acids, urea, and substituted benzaldehydes. 8-Hydroxy-4,5-diphenyl-3,4-dihydropyrimido[4,5-d]pyridazin-2( 1H)-one was synthesized by the reaction of 5-benzoyl-2-oxo-6-phenyl-1,2,3,6-tetrahydropyrimidin-4-carboxylate with hydrazine hydrate.

Interaction of methyl esters of acylpyruvic acides with mixture of aromatic aldehyde and tryptamine or 5-methoxytryptamine leads to 5-aryl-4-acyl-3-hydroxy-1-[2-(3-indolil)-ethyl)-2,5-dihydropyrrol-2-ones (I). The compounds (I) were transformed to 3,4-diaryl-1,4,5,6-tetrahydro-6-oxo-5-(2-(3-indolil)-ethyl)pyrrolo[3,4-c]pyrazoles (II) by reaction with hydrazine-hydrate. The structure of received compounds is established. The analgetical activity of compounds (I б-е) and (II) is investigated.

Interaction of methyl esters of acylpyruvic acides with mixture of aromatic aldehyde and tryptamine or 5-methoxytryptamine leads to 5-aryl-4-acyl-3-hydroxy-1-[2-(3-indolil)-ethyl)-2,5-dihydropyrrol-2-ones (I). The compounds (I) were transformed to 3,4-diaryl-1,4,5,6-tetrahydro-6-oxo-5-(2-(3-indolil)-ethyl)pyrrolo[3,4-c]pyrazoles (II) by reaction with hydrazine-hydrate. The structure of received compounds is established. The analgetical activity of compounds (I б-е) and (II) is investigated.

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The reaction of substituted methyl aroylpyruvates with 1-aminomethyl-1,2,3,4-tetrahydroisoquinoline dihydrochloride in the presence of AcOH gives 3-aroylmethylene-1,6,7,11b-tetrahydro-2H-pyrazino[2,1-a]isoquinolin-4-ones whose structures have been confirmed by IR, 1H NMR, and mass spectrometry.

It is shown by IR and UV spectroscopy that the products of the reaction of o-hydroxybenzoylformic acid with o-phenylenediamine and o-aminophenol have the 3-(cyclohexa-3,5-dien-2-onylidene)quinoxalone structure rather than the 3-(o-hydroxyphenyl)-2-quinoxalone structure. 3-(o-Methoxyphenyl)-2-quinoxalone and 3-(o-methoxyphenyl)-3,4-dihydro-2H-benzo-1,4-oxazin-2-one were synthesized as model compounds.