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Substituted quinoline carboxylic acid derivatives
This invention relates to new compounds of value as antibacterial agents. More particularly, it relates to quinoline carboxylic acid derivatives, the hydrates and the acid or alkali addition salts thereof.
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(2008/06/13)

Structure-Activity Relationships of Antibacterial 6,7- and 7,8-Disubstituted 1-Alkyl-1,4-dihydro-4-oxoquinoline-3-carboxylic Acids
Previous quantitative and qualitative structure-activity studies in antibacterial monosubstituted 1-ethyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acids prompted us to synthesize the 6,7,8-polysubstituted compounds.In this paper, the preparation and antibacterial activity of the 6,7- and 7,8-disubstituted compounds and their derivatives are described.Among these compounds, 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)quinoline-3-carboxylic acid (34) possessed many significant activities and was more active than oxolinic acid (84) against Gram-positive andGram-negative bacteria.Structure activity relationships are discussed.
Koga, Hiroshi,Itoh, Akira,Murayama, Satoshi,Suzue, Seigo,Irikura, Tsutomu
p. 1358 - 1363
(2007/10/02)