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US 5,476,950 AGranted
Intermediates for pyridonecarboxylic acid derivatives
AssigneeDaiichi Seiyaku Co., Ltd.
InventorsIsao Hayakawa, Shohgo Atarashi
Life of this patent
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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.
Claims4
A compound represented by the following formula:
- ##STR46## wherein R.sup.1 represents a hydrogen or an alkyl group having from 1 to 6 carbon atoms, R.sup.2 and R.sup.3 form together a methylene chain having from 2 to 5 carbon atoms.
3-(1-aminocyclopropyl)pyrrolidine.
Dependencies are inferred from the claim text.