Discovery of Quinazoline-2,4(1 H ,3 H )-Dione Derivatives as Potential Antibacterial Agent: Design, Synthesis, and Their Antibacterial Activity.

In this paper, we report on the design and synthesis of a novel series of quinazoline-2,4(1 H ,3 H )-dione derivatives as fluoroquinolone-like inhibitors of bacterial gyrase and DNA topoisomerase IV to identify and develop antimicrobial agents to prevent bacterial resistance problems. Their structures were confirmed using spectroscopic analyses (IR, NMR, and EI-MS). The novel quinazoline-2,4(1 H ,3 H )-dione derivatives were evaluated for their antimicrobial activities against Gram-positive and Gram-negative bacterial strains using the Agar well diffusion method to study the antimicrobial activities and compared them with the standard drugs. Most compounds displayed moderate activity. Among the tested compounds, the most promising compounds 13 and 15 provided broad bioactive spectrum against Gram-positive and Gram-negative strains compared to the standard drugs.