Chemical modification of thiadiazole may lead to a potent therapeutic agent. In this study, biological properties of thiadiazole derivatives were evaluated by assessing their antimicrobial and anti-inflammatory activities.

A series of novel derivatives of N-(5-(1-methyl-indol-3-yl)-1,3,4-thiadiazol-2- yl)-2-(5-substitutedphenyl)-3-(phenylamino)-4,5-dihydropyrazol-1-yl) acetamide have been synthesized and evaluated for their antimicrobial activity. Anti-inflammatory activity was done using carrageenan-induced inflammation in rat paw edema model. In-silico molecular docking studies of the synthesized compounds were performed on crystal structures of Aspergillus niger, Bacillus subtilis, Candida albicans, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Cyclooxygenase-2 (obtained from www.rcsb.org) using GRIP batch docking method of V-life MDS 3.0 software. The structures of the newly synthesized compounds were confirmed by FT-IR, 1H-NMR, 13C-NMR and Mass spectroscopy.

Antimicrobial and Anti-inflammatory activity study of the novel synthesized compounds were screened. Synthesized compounds having methoxy substitution on the 3rd and 4th positions of aromatic ring are utmost active amongst all the derivatives. Compounds 6d, 6i, 6j and 6l were found to possess good anti-inflammatory activity having percentage of inhibition to the extent of 46.8%, 48.1%, 49.4%, and 48.5% as compared with Diclofenac.

The experimental results were further supported by molecular docking analysis describing the better interaction patterns.