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Asahina, Yoshikazu; Iwase, Kazuhiko; Iinuma, Fujio; Hosaka, Masaki; Ishizaki, Takayoshi
Journal of medicinal chemistry, 05/2005, Letnik: 48, Številka: 9Journal Article
The novel 1-(2-fluorovinyl)-4-quinolone-3-carboxylic acid derivatives Z-15a − c, E-15a − c, Z-16a − c, and E-16a − c, conformationally restricted analogues of fleroxacin (5), were synthesized, and their in vitro antibacterial activity was evaluated. A dehydrosulfenylation of a 2-fluoro-2-(4-methoxyphenyl)sulfinylethyl group was employed as a key step for the construction of a 2-fluorovinyl group at the N-1 position. It appeared evident that the Z-isomers Z-15a − c and Z-16a − c exhibited 2- to 32-fold more potent in vitro antibacterial activity than the corresponding E-isomers E-15a − c and E- 16a − c. Furthermore, since Z-15b showed in vitro antibacterial activity and DNA gyrase inhibition comparable to that of 5, it was hypothesized that the conformation of Z-15b would be equivalent to the active conformer of 5. The results revealed that the antibacterial Z-1-(2-fluorovinyl)quinolone derivatives carry the novel N-1 substituent of the fluoroquinolones.
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