A series of novel 4-bromo-2-(3-methyl-1-(substituted-phenylsulfonyl)-4,5-dihydro-1H-pyrazol-5-yl) phenol derivatives
were synthesized and characterized by NMR, ESI-MS. Compound 3c was determined by X-ray. Biological activity
tests results show that compound 3h displayed activity with MIC of 0.39, 0.78, 1.562 µg/mL against B. subtilis
ATCC 6633, S. aureus ATCC 6538, P. fluorescens ATCC 13525 and could strongly inhibit S. aureus DNA gyrase and B.
subtilis DNA gyrase with IC50s of 0.25 and 0.18 µg/mL respectively.
Keywords: Synthesis, Design, Phenylsulfonyl, Dihydropyrazole, DNA gyrase, Antibacterial activity.
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