Abstract: A series of 1,3-oxazole, 1,3-thiazole, isomeric 1,2,4-oxadiazole, 1,3,4-oxadiazole, and 1,2,3,4-tetrazole heterocycles was synthesized. All the compounds shared as a common feature the presence of a 4-hydroxyphenyl substituent. The structures of the synthesized compounds were confirmed by MS, 1H-NMR, and elemental analysis. In vitro antimicrobial activity for all the newly synthesized compounds at concentrations of 200-25 μg/mL was evaluated against Gram+ve organisms such as methicillin-resistant Staphylococcus aureus (MRSA), Gram–ve organisms such as Escherichia coli (E. coli), and the fungal strain Aspergillus niger (A. niger) by the cup plate method. Ofloxacin and ketoconazole (10 μg/mL) were used as reference standards for antibacterial and antifungal activity, respectively. Compounds 15, 16, and 20 showed notable antibacterial and antifungal activities at higher concentrations (200 μg/mL), whereas 17-19 were found to display significant antibacterial or antifungal activity (25-50 μg/mL) against the Gram+ve, Gram–ve bacteria, or fungal cells used in the present study.
Keywords: 1,3-oxazole; oxadiazole congeners; 1,3-thiazole; tetrazole; antibacterial; antifungal
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Sadek, B.; Fahelelbom, K.M.S. Synthesis, Characterization, and Antimicrobial Evaluation of Oxadiazole Congeners. Molecules 2011, 16, 4339-4347.
Sadek B, Fahelelbom KMS. Synthesis, Characterization, and Antimicrobial Evaluation of Oxadiazole Congeners. Molecules. 2011; 16(6):4339-4347.
Sadek, Bassem; Fahelelbom, Khairi Mustafa Salem. 2011. "Synthesis, Characterization, and Antimicrobial Evaluation of Oxadiazole Congeners." Molecules 16, no. 6: 4339-4347.