Microwave Assisted Synthesis of 1, 3, 4 Oxadiazole Derivatives for its Antibacterial Activity

The present study focuses on the microwave-assisted synthesis of 1, 3, 4-oxadiazole derivatives and their evaluation for antibacterial activity. 1, 3, 4-Oxadiazoles are valuable heterocyclic compounds known for strong antimicrobial properties due to their stable five-membered ring and bioisostere nature. Microwave irradiation enabled rapid, efficient synthesis with reduced reaction time, higher yields, and minimal solvent use compared to conventional heating. The synthetic pathway included the preparation of substituted methyl carboxylates, Carbohydrazide, 5-substituted 1, 3, 4-oxadiazole-2-amines, and final formamide derivatives. Product formation was confirmed through melting-point measurements and TLC analysis. Antibacterial activity was assessed by the agar-well diffusion method using ciprofloxacin as the standard. Several synthesized derivatives showed notable inhibitory zones against tested bacterial strains. Overall, the study demonstrates that microwave-assisted synthesis is a fast, eco-friendly, and effective approach for generating bioactive oxadiazole derivatives.