Journal of the Serbian Chemical Society 2006 Volume 71, Issue 5, Pages: 471-481
doi:10.2298/JSC0605471E
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Pyrazine-2-substituted carboxamide derivatives: synthesis, antimicrobial and leuconostoc mesenteroides growth inhibition activity

El-Wahab Abd A.H.F., Bedair A.H., Eid F.A., El-Haddad A.F., El-Deeb Adawy A.M., El-Sherbiny G.M.

Condensation of pyrazine-2,3-dicarboxylic acid anhydride with aminoacetophenones gave the corresponding N-(acetylphenyl)pyrazine-2-carboxamide. Their reactions with some electrophilic (carbonyl group, bromine) and nucleophilic (malononitrile hydrazine) reagents are discussed. N-[3-(2,2-Dicyano-1-methylethenyl)phenyl]pyrazine- 2-carboxamide underwent Michael addition reaction with an activated double bond yielding 3-amino-5-aryl-3’-(pyrazine-2-carboxamido)biphenyl-2,4-dicarbonitrile derivatives and 2-imino-4-(3-(pyrazine-2-carboxamido)phenyl)-6-(4-methoxyphenyl)cyclohexa 3,5-diene-1,1,3-tricarbonitrile. The structures of the newly synthesized compounds were confirmed by their IR, 1H NMR, 13C NMR and mass spectra data. Antimicrobial acitivites and Leuconostoc sp. growth inhibition of the newly synthesized compounds were studied and some of these were found to exhibit a pronounced effect.

Keywords: pyrazine-2, 3-dicarboxylic acid anhydride, N-(acetylphenyl)-pyrazine-2-carboxamide, [(pyrazine-2-carboxamido)phenyl]ethylidene]hydrazine, 3-amino-5-aryl-3’-(pyrazine-2-carboxamido)biphenyl-2, 4-dicarbonitrile, Leuconostoc sp. Growth inhibition

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