title: Antitubercular activity of novel substituted 4,5-dihydro-1H-1-pyrazolylmethanethiones.
abstract: A series of, anilino-5-(substituted) phenyl-3-(4-hydroxy-3-methylphenyl)-4,5-dihydro-1H-1-pyrazolylmethanethione and 2-chloroanilino-5-(substituted) phenyl-3-(4-hydroxy-3-methylphenyl)-4,5-dihydro-1H-1-pyrazolylmethanethione were synthesized by the reaction between hydrazine hydrate and the chalcones (3a-k) followed by condensation with the appropriate aryl isothiocyanate which yielded the N-substituted pyrazoline derivatives. These were tested for their in-vitro anti-mycobacterial activity against INH resistant Mycobacterium tuberculosis (INHR MTB) using the BACTEC 460 radiometric system. Compound 2-chloroanilino-5-(2,6-dichlorophenyl)-3-(4-hydroxy-3-methylphenyl)-4,5-dihydro-1H-1-pyrazolyl-methanethione (6i) was found to be most active agent with a minimum inhibitory concentration of 0.96 microg/mL.
authors.affiliation: Faculty of Pharmacy, Jamia Hamdard University, Department of Pharmaceutical Chemistry, Hamdard Nagar, New Delhi 110062, India.
authors.forename: Mohamed Ashraf
authors.initials: MA
authors.lastname: Ali
authors.forename: Mohammad Shahar
authors.initials: MS
authors.lastname: Yar
mesh_terms: D000995:Antitubercular Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D009169:Mycobacterium tuberculosis / Q000187:drug effects*; D011720:Pyrazoles / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D013329:Structure-Activity Relationship; D013871:Thiones / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D000995:Antitubercular Agents; D011720:Pyrazoles; D013871:Thiones