Synthesis and Anti-Biofilm Activity Studies on Novel Quinazolinone-Thiadiazole Hybrids

Objective: In this study it was aimed to synthesize novel 1,3,4-thiadizole bearing 4(3H)-quinazolinone compounds, elucidate their structure and evaluate their anti-biofilm activity. Methods: Four novel 4(3H)-quinazolinone compounds (1-4) were synthesized with a two step reaction starting from 5-bromoanthranilic acid. Their anti-biofilm activity was investigated. Results: The final compounds’ structures were clarified by elemental analysis and spectroscopic methods (IR, 1H-NMR, 13C-NMR and MS). In the result of anti-biofilm activity studies, they possessed 26.0-30.0% biofilm formation inhibition. Conclusion: Among the tested compounds, 6-bromo-3-{4-[5-(4-nitrophenylamino)-1,3,4-thiadiazol-2-yl]phenyl}-2-methylquinazolin-4(3H)-one formulated compound 3 was found as the most active one with 30.0% biofilm formation inhibition.