Kc. Fang et al., Synthesis, antibacterial, and cytotoxic evaluation of certain 7-substituted norfloxacin derivatives, J MED CHEM, 43(20), 2000, pp. 3809-3812
We report herein the synthesis and biological evaluation of two series of 7
-substituted norfloxacin derivatives. Most compounds tested in this study d
emonstrated better activity against methicillin-resistant Staphylococcus au
reus than norfloxacin. Preliminary in vitro evaluation indicated that the 7
-[4-(2-hydroxyiminoethyl)piperazin-1-yl] derivatives 3b-e possess distinct
cytotoxicity profiles as compared with their alpha-methylene-gamma-butyrola
ctone counterparts, 4b,e: i.e., excellent activities against the renal canc
er subpanel. Among them, 1-ethyl-6-fluoro-7-{4-[2-(4-chlorophenyl)-2-hydrox
yiminoethyl]-1-piperazinyl}-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid (3
d) demonstrated the most significant activities against renal cancer cell l
ines, with log GI(50) values of -6.40 against CAK-1, -6.14 against RXF 393,
and -7.54 against UO-31, compared with a mean log GI(50) value of -5.03.