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2 Polish Journal of Chemistry

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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

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

Polish Journal of Chemistry

2002

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.

Synthesis of some new pyrimidines, thienopyrimidines and thiopyranopyrimidines

Assy M.G., Amer A.M., El-Bahaie S., Halima E.A.

Polish Journal of Chemistry

1998

Vol. 72, nr 1

61-65

Isothiocyanate 1 reacted with enaminone 2 to give thioamide 3 that cyclized by sodium hydroxide to pyrimidine 4 but cyclized by bromine to give isothiazole 5, pyrimidine 4 was transformed into thiopyranopyrimidines 7, 9 or 11 upon respective reaction with benzaldehyde, maleic acid , or maleic anhydride. Aminative cyclization of 4 yielded isothiazolopyrimidine 13. Reaction of 4 and ethyl bromoacetate or phenacyl bromides afforded thienopyrimidines 15a-b respectively. Oxidation of 4 yielded oxopyrimidine 16.