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.
公式为##STR1##的8-甲氧基喹啉羧酸衍生物,其中R.sub.1是氢原子、低烷基、苯基烷基或在生物体内可水解的酯基,R.sub.2是氢原子或甲基,n是1的整数,其光学异构体、药学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大的体外和体内抗菌作用,可对抗革兰氏阳性菌,同时保持对革兰氏阴性菌的强大抗菌作用,这是传统喹啉羧酸抗菌剂所没有的。此外,本发明的化合物几乎不显示问题副作用,毒性低。因此,它们被期望作为抗菌剂表现出卓越的临床效果。