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Two series of sulfonamides were synthesized from 4-hydrazinyl­ben­zenesulfonamide as the key starting material. 1,3,5-Tri­arylpyrazoline sulfon­amides ( 2a – i ) were obtained by cyclocondensation of various chalcones in 53–64 % yields, while 4-thiazolidinone derivatives ( 4a – e ) were synthesized by cyclocondensation between mercaptoacetic acid and different phenylhydra­zones in 43–62 % yields. The synthesized compounds were characterized based on FTIR, 1H-NMR, 13C-NMR and HRMS data. The sulfonamides were evaluated for their in vitro antimicrobial activities against four bacterial strains (E. coli, P. aeruginosa, B. subtillis and S aureus), two filamentous fungal strains (A. niger and F. oxysporum) and two yeast strains (C. albicans and S. cerevisiae). Seven pyrazolines, 2a – c and 2e – h , exhibited significant inhibition of different microbial strains. Among them, compound 2b displayed good anti­fungal activity against A. niger (MIC value at 12.5 mg mL-1) over the reference drug.

Synthesis of sulfonamides bearing 1,3,5-triarylpyrazoline and 4-thiazolidinone moieties as novel antimicrobial agents