Synthesis and Characterization of Some New Pyridine-Carboxamide Derivatives of Potential Biological Activities

A facile synthetic routes to access some new heterocyclic systems containing potent pharmacophoric groups such as pyrazole, pyrazolo[5,1-c]-1,2,4-triazine, 1,2,4-triazino[4,3-a]benzimidazole, and pyridine moieties linked to pyridine-carboxamide moiety are reported. Construction of the target compounds was achieved via reaction of 3-oxo-butanamides 1a,b with hydrazonoyl halides, heterocyclic diazonium salts, and malononitrile derivatives, respectively. The structures of the new products were confirmed by all possible spectral and elemental analyses. The antibacterial assessment showed that one product was moderately active against both K. pneumonia and S. aureus.