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The global spread of bacterial resistance to drugs used in therapy requires new potent and safe antimicrobial agents. DNA gyrases represent important targets in drug discovery. Schiff bases, thiazole, and triazole derivatives are considered key scaffolds in medicinal chemistry. Fifteen thiazolyl-triazole Schiff bases were evaluated for their antibacterial activity, measuring the growth inhibition zone diameter, the minimum inhibitory concentration (MIC), and the minimum bactericidal concentration (MBC), against Gram-positive ( Staphylococcus aureus , Listeria monocytogenes ) and Gram-negative ( Escherichia coli , Salmonella typhimurium , Pseudomonas aeruginosa ) bacteria. The inhibition of S. aureus and S. typhimurium was modest. Compounds B1 , B2 , and B9 showed a similar effect as ciprofloxacin, the antimicrobial reference, against L. monocytogenes . B10 displayed a better effect. Derivatives B1 , B5 - 7 , B9 , and B11 - 15 expressed MIC values lower than the reference, against L. monocytogenes . B5 , B6 , and B11 - 15 strongly inhibited the growth of P. aeruginosa . All compounds were subjected to an in silico screening of the ADMET (absorption, distribution, metabolism, elimination, toxicity) properties. Molecular docking was performed on the gyrA and gyrB from L. monocytogenes . The virtual screening concluded that thiazolyl-triazole Schiff base B8 is the best drug-like candidate, satisfying requirements for both safety and efficacy, being more potent against the bacterial gyrA than ciprofloxacin.

Antibacterial Evaluation and Virtual Screening of New Thiazolyl-Triazole Schiff Bases as Potential DNA-Gyrase Inhibitors