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1 Polish Journal of Chemistry

1 2002

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1-(N,N-Dimethylamino)-2-(N-phenylcarbamoyl)-1-buten-3-one as a Building Block for the Synthesis of Heterocyclic Compounds

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Elmaati T. , Said S. , Elenein N. A. , Sofan M. , Khodeir N.

Polish Journal of Chemistry

2002

tom Vol. 76 / nr 7

945-952

Acetoacetanilide 1 reacted withDMF-DMAto give the enaminone 2. Compound 2, when treated with hydrazines gives the pyrazoles 4a and 4b respectively, and with pyrazole derivatives 5a and 5b the pyrazolopyrimidines 7. On the other hand, in reaction of 2 with benzimidazole and benzimidazole-2-acetonitrile, the pyrimidobenzimidazole 14 and the pyridobenzimidazole 17 were formed. 2 reacts with hippuric acid in boiling acetic anhydride to afford the pyridine 20. In the reaction of 2 with malononitrile, cyanoacetamide or malononitrile dimer compounds 21, 22 and 24 were formed. Compound 22 was further reacted with arylidenemalononitriles to give the benzopyridine derivatives 28. Pyridone 22 treated with S-DMF mixture gives thienopyridine 29, while refluxed with DMFDMA yielded the pyridopyridine 30.