Affiliation: Department of Pharmaceutical Sciences, National Institute of Medical Sciences University, Jaipur 303 121, India.
In the present investigation, a series of 3-substituted-N-aryl-6,7-dimethoxy-3a,4-dihydro-3H-indeno[1,2- c]pyrazole-2-carboxamide analogs were synthesized based on the structure of known antitubercular drug thiacetazone and were evaluated for antitubercular activity by two fold serial dilution technique. A computational study was carried out for prediction of pharmacokinetic properties and none of the compounds violated Lipinski “Rule of Five”. The structures of the synthesized compounds were confirmed on the basis of their spectral data and elemental analysis. All the newly synthesized compounds showed low to good activity inhibitory activities against Mycobacterium tuberculosis H37Rv (MTB) and isoniazid resistant M. tuberculosis (INHR-MTB). 3-(4-fluoromethyl)-N-(2-chlorophenyl)-6,7-dimethoxy-3a,4- dihydro-3H-indeno[1,2-c]pyrazole-2-carboxamide (4c) was found to be the most promising compound active against M. tuberculosis H37Rv and isoniazid resistant M. tuberculosis (INHR-MTB) with minimum inhibitory concentration 0.83 and 3.35 μM respectively.