申请人:Korea Research Institute of Chemical Technology
公开号:US05631266A1
公开(公告)日:1997-05-20
The present invention relates to quinolone carboxylic acid derivatives having useful antibacterial activities of formula (I): ##STR1## wherein, R.sub.1, R.sub.2, and R.sub.3, which may be the same or different, are each hydrogen or a halogen atom, or a lower alkyl group optionally substituted with an amino or a hydroxy group; R.sub.4 is hydrogen atom, a lower alkyl, benzyl, t-butoxycarbonyl or ethoxycarbonyl group; R.sub.5 is hydrogen, chlorine atom, methyl or an amino group; R.sub.6 is a lower alkyl group, or a cyclopropyl or a phenyl group optionally substituted with a halogen atom; and X is nitrogen atom, or a methyne group optionally substituted with a lower alkyl or a lower alkoxy group or a halogen atom, and pharmaceutically acceptable salts thereof, and processes for preparing these compounds. The present invention also relates to novel intermediates which are useful for preparing the quinolone compounds of the invention.
本发明涉及具有有用的抗菌活性的喹诺酮羧酸衍生物的公式(I):## STR1 ##其中,R.sub.1,R.sub.2和R.sub.3可能相同或不同,均为氢或卤素原子,或者是可选择用氨基或羟基取代的较低烷基基团;R.sub.4是氢原子,较低烷基,苄基,t-丁氧羰基或乙氧羰基基团;R.sub.5是氢,氯原子,甲基或氨基基团;R.sub.6是较低烷基基团,或者是可选择用卤素原子取代的环丙基或苯基基团;X是氮原子,或者是可选择用较低烷基或较低烷氧基团或卤素原子取代的甲亚基基团,以及其药学上可接受的盐,以及制备这些化合物的过程。本发明还涉及用于制备本发明中的喹诺酮化合物的新型中间体。