Intermediates for pyridonecarboxylic acid derivatives
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United States of America Patent
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Jan 10, 1995
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N/A
app pub date -
Mar 4, 1994
filing date -
Jun 26, 1985
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Abstract
This invention provides novel pyridonecarboxylic acid derivatives having a quite high antimicrobial activity. The derivatives have the following formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 represent each a hydrogen or C.sub.1 -C.sub.6 alkyl group; R.sup.4 represents an ethyl, 2-fluoroethyl, vinyl, isopropyl, isopropenyl or cyclopropyl group; and X represents CH, C--F, C--Cl or N characterized in that R.sup.2 and R.sup.3 are not hydrogen at the same time.
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