Synthesis, characterization and biological screening of pyrazole-conjugated benzothiazole analogs.

Abstract

Benzothiazole and pyrazoles are two important pharmacophores, the activity can be enhanced by conjugating them. Here, two novel series of the pyrazole-conjugated benzothiazole derivatives were synthesized. Synthesized compounds were characterized by Fourier-transform infrared, LC-MS, 1H NMR and 13C NMR spectroscopic techniques. Synthesized compounds exhibited moderate antimicrobial, antioxidant and excellent anti-TB activities. In in vitro anti-TB activity, 4d and 4e exhibited 1.6μg/ml minimum inhibitory concentration value. In order to rationalize the anti-TB activity, molecular docking studies were carried out and they were correlated with the in vitro results. Compounds containing electron donating groups show the promising antimicrobial and antioxidant activities, compounds with CH3 and Cl substitution show excellent anti-TB activity. Synthesized molecules may become potential candidates for the clinical trials.