Synthesis and biological evaluation of novel substituted 1,3,4-thiadiazole and 2,6-di aryl substituted imidazo [2,1-b] [1,3,4] thiadiazole derivatives

•Microwave-assisted synthesis of 1,3,4-thiadiazole derivatives were synthesized.•The in-vitro antimicrobial evaluation was carried out.•Most of the synthesized compounds showed appreciable antimicrobial activity.

A new series of N-[5-(4-(alkyl/aryl)-3-nitro-phenyl)-[1,3,4-thiadiazol-2-yl]-2,2-dimethyl-propionamide 4 (a–l) and 6-(4-Methoxy-phenyl)-2-(4-alkyl/aryl)-3-nitro-phenyl)-Imidazo [2,1-b] [1,3,4] thiadiazole 6 (a–l) were synthesized starting from 5-(4-Fluoro-3-nitro-phenyl)-[1,3,4] thiadiazole-2-ylamine. The synthesized compounds were characterized by IR, NMR, mass spectral and elemental analysis. All the compounds were tested for antibacterial and antifungal activities. The antimicrobial activities of the compounds were assessed by well plate method (zone of inhibition). Compounds 4a, 4c and 6e, 6g displayed appreciable activity at the concentration 0.5–1.0 mg/mL.

Graphical abstractThe manuscript deals with the synthesis of new series of 1,3,4-thiadiazole 4 (a–l) and 2,6-di aryl imidazo [2,1-b] [1,3,4] thiadiazole 6 (a–l) derivatives. Synthesized compounds were characterized and screened for their antimicrobial activities.Figure optionsDownload full-size imageDownload as PowerPoint slide