Synthesis and Antimicrobial Evaluation of Quinazoline-4[3H]-one Derivatives

The present investigation aimed to synthesize quinazoline-4(3H)-one derivatives (B1-10) and evaluated their antimicrobial activity. The test compounds (B1-10) were obtained by reaction of 2- phenyl-4H-benzo[d] [1, 3]oxazin-4-one (1) with 4-aminophenol (2) to afford 3-(4-hydroxyphenyl)-2- phenylquinazoline-4(3H)-one (3) which were further reacted with different N-phenylacetamide (4) in the presence of anhydrous potassium carbonate and a catalytic amount of potassium iodide in ethylmethylketone. The test compounds (B1-10) were characterized by the spectroscopic method and evaluated for their antimicrobial activity using the cup plate method by measuring the zone of inhibition. Among the compounds, compound B1, B2, B4, B6, and B8 showed maximum zone of inhibition as compared to standard drug ciprofloxacin and fluconazole against Bacillus subtilis, Escherichia coli and Aspergillus niger. Molecular docking was also performed for test compounds to predict their binding affinities in the target protein and results showed good drug-like properties.