申请人:Yoshitomi Pharmaceutical Industries, Ltd.
公开号:US05677316A1
公开(公告)日:1997-10-14
8-Methoxy-quinolonecarboxylic acid derivatives of the formula ##STR1## wherein R.sub.1 is a hydrogen atom, a lower alkyl, a phenylalkyl or an ester residue hydrolyzable in the living body, R.sub.2 is a hydrogen atom or methyl and n is an integer of 1, optical isomers thereof, pharmaceutically acceptable salts thereof and hydrates thereof. The 8-methoxy-quinolonecarboxylic acid derivatives of the present invention have enforced and a wide range of in vitro and in vivo antibacterial effects against Gram-positive bacteria, while retaining a strong antibacterial effect against Gram-negative bacteria, that the conventional quinolonecarboxylic acid antibacterial agents have. In addition, the compounds of the present invention scarcely show problematic side-effects and are low toxic. Therefore, they are expected to show superior clinical effects as antibacterial agents.
本发明涉及8-甲氧基喹啉羧酸衍生物,其化学式为##STR1##其中R.sub.1为氢原子,低级烷基,苯基烷基或可在活体内水解的酯基残基,R.sub.2为氢原子或甲基,n为1的整数,其光学异构体、制药上可接受的盐和水合物。本发明的8-甲氧基喹啉羧酸衍生物具有强制和广泛的体外和体内抗革兰阳性细菌的效果,同时保留了对革兰阴性细菌的强大抗菌效果,这是传统的喹啉羧酸抗菌剂所具有的。此外,本发明的化合物几乎不显示问题的副作用,并且毒性低。因此,它们预计作为抗菌剂表现出优越的临床效果。