Synthesis and in vitro antibacterial activity of novel fluoroquinolone derivatives containing substituted piperidines

We report herein the synthesis of novel 7-(4-alkoxyimino-3-aminomethyl-3-methylpiperidin-1-yl) fluoroquinolone derivatives. The antibacterial activity of the newly synthesized compounds was evaluated and correlated with their physicochemical properties. Results reveal that all of the target compounds have good potency in inhibiting the growth of Staphylococcus aureus and Staphylococcus epidermidis including MRSE (MIC: 0.125–4 μg/mL). Compounds 12, 13 are more potent than or comparable to levofloxacin against MRSA, Streptococcus pyogenes, Escherichia coli, Klebsiella pneumoniae, and Shigella sonnei. Compound 17 is more active than or comparable to levofloxacin against S. aureus including MRSA, S. epidermidis and S. pyogenes.