申请人:Daiichi Seiyaku Co., Ltd.
公开号:US05098912A1
公开(公告)日:1992-03-24
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 wherein (i) one of R.sup.1, R.sup.2 and R.sup.3 represents a hydrogen or C.sub.1 -C.sub.6 alkyl group, and (ii) either R.sup.1 forms a methylene chain having 2 to 4 carbon atoms together with R.sup.2 or R.sup.3, or R.sup.2 and R.sup.3 form together an alkylene chain having 2 to 5 atoms and R.sup.4 represents an ethyl, 2-fluorethyl, vinyl, isopropyl, isopropenyl or cyclopropyl group and X represents CH, C-F, or C-Cl and salt thereof.
该发明提供了一种具有相当高抗微生物活性的新型吡啶酮羧酸衍生物。该衍生物具有以下公式:##STR1## 其中,R.sup.1、R.sup.2和R.sup.3分别表示氢或C.sub.1-C.sub.6烷基;R.sup.4表示乙基、2-氟乙基、乙烯基、异丙基、异丙烯基或环丙基;X表示CH、C-F、C-Cl或N,其中(i) R.sup.1、R.sup.2和R.sup.3中的一个表示氢或C.sub.1-C.sub.6烷基,且(ii) 要么R.sup.1与R.sup.2或R.sup.3一起形成具有2至4个碳原子的亚甲基链,要么R.sup.2和R.sup.3一起形成具有2至5个原子的烷基链,而R.sup.4表示乙基、2-氟乙基、乙烯基、异丙基、异丙烯基或环丙基,X表示CH、C-F或C-Cl及其盐。