Design, Synthesis, and Antimicrobial Activity of Novel 6-Oxopyrimidin-1(6H)-yl Benzamide Derivatives

A series of novel 1-(benzamide)-N-cyclopropyl-2-(amino substituted)-6-oxo-1,6-dihydropyrimidine-5-carboxamide derivatives is synthesised and characterized by IR, 1H and 13C NMR, and mass spectra. The synthesized compounds 6a-6j and 8a-8j are screened for their in vitro antimicrobial activity against two Grampositive (Staphylococcus aureus, Bacillus subtilis) and two Gram-negative bacteria (Escherichia coli, Klebesiella aerogenes), and two pathogenic fungi (Aspergillus flavus, Fusarium oxysporum). Most of the compounds demonstrate good to excellent antimicrobial activity in comparison with the standard drugs ciproflaxin and hymexazole. Among the screened compounds morpholine substituted dihydropyrimidone carboxamide 8j is determined to be the most potent anti-bacterial agent.