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• W2034442102 abstract "We previously demonstrated that 5-amino-7-(3-amino-1-pyrrolidinyl)-1-cyclopropyl-1, 4-dihydro-8-methyl-4-oxoquinoline-3-carboxylic acid (7) has strong in vitro antibacterial activity even against quinolone-resistant bacteria.We examined optimization of the 3-aminopyrrolidine moiety of 7 by introduction of C-alkyl (Me, Et, Pr, di-Me, cyclopropyl) and N-alkyl groups (Me, di-Me). C-Alkylation at the 4-position of the 3-aminopyrrolidine moiety enhanced in vitro and in vivo antibacterial activity. (S)-5-Amino-7-(7-amino-5-azaspiro[2.4]hept-5-yl)-1-cyclopropyl-6-fluoro-1, 4-dihydro-8-methyl-4-oxoquinoline-3-carboxylic acid (15h) and (3S, 4S)-5-amino-7-(3-amino-4-methyl-1-pyrrolidinyl)-1-cyclopropyl-6-fluoro-1, 4-dihydro-8-methyl-4-oxoquinoline-3-carboxylic acid (15b) showed strong antibacterial activity (in vitro antibacterial activity including quinolone-resistant bacteria is 4 times more potent than that of ciprofloxacin (CPFX) (1); in vivo antibacterial activity is 1.5 to 20 times more potent than that of CPFX (1)) and reduced quinolone toxicity (free from both phototoxicity at a dosage of 30 mg/kg in guinea pigs (i.v.) and convulsion when coadministered with 4-biphenylacetic acid at a dosage of 20 μg in rats (i.c.v.)). Their selectivity between DNA topoisomerase II (derived from eukaryotic cells) and DNA gyrase (derived from bacterial cells) was about 3000-fold." @default.
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• W2034442102 date "1996-01-01" @default.
• W2034442102 modified "2023-09-23" @default.
• W2034442102 title "Studies on Quinolone Antibacterials. V. Synthesis and Antibacterial Activity of Chiral 5-Amino-7-(4-substituted-3-amino-1-pyrrolidinyl)-6-fluoro-1,4-dihydro-8-methyl-4-oxoquinoline-3-carboxylic Acids and Derivatives." @default.
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• W2034442102 doi "https://doi.org/10.1248/cpb.44.1376" @default.
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