申请人:Dainippon Pharmaceutical Co., Ltd.
公开号:US04341784A1
公开(公告)日:1982-07-27
The present invention provides a 1,8-naphthyridine compound of the formula ##STR1## wherein R is hydrogen, methyl, ethyl or propyl, and a nontoxic pharmaceutically acceptable salt thereof, and a process for preparing a 1,8-naphthyridine compound of the above formula which comprises (A) reacting a compound of the formula ##STR2## wherein Y is halogen, lower alkoxy, lower alkylthio, lower alkylsulfinyl, lower alkylsulfonyl, lower alkylsulfonyloxy or arylsulfonyloxy, and R.sub.1 is hydrogen or lower alkyl, with a compound of the formula ##STR3## wherein R.sub.2 is hydrogen or a protective group for the amino group, and R is as defined above, and when a reaction product in which R.sub.1 is lower alkyl and/or R.sub.2 is the amino protective group is obtained, treating it with an acid or base, and/or reductively cleaving it, (B) decomposing a compound of the formula ##STR4## wherein A .crclbar. is a fluorine-containing anion, and R.sub.1 and R.sub.2 are as defined above, and when a reaction product in which R.sub.1 is lower alkyl and/or R.sub.2 is the amino protective group is obtained, treating it with an acid or base, and/or reductively cleaving it, (C) treating a compound of the formula ##STR5## wherein R'.sub.1 is hydrogen or lower alkyl, R'.sub.2 is hydrogen or a protective group for the amino group, provided that R'.sub.1 and R'.sub.2 are not hydrogen atoms at the same time, and R is as defined above, with an acid or base, and/or reductively cleaving it, and optionally converting the resulting compound to a nontoxic pharmaceutically acceptable salt thereof. The 1,8-naphthyridine compound is useful as an antibacterial agent.
本发明提供了一种1,8-萘啶化合物,其化学式为##STR1##其中R为氢、甲基、乙基或丙基,以及其非毒性药用可接受的盐,并且提供了一种制备上述化合物的1,8-萘啶化合物的方法,包括(A)将化学式为##STR2##其中Y为卤素、较低烷氧基、较低烷基硫基、较低烷基磺酰基、较低烷基磺酰氧基或芳基磺酰氧基的化合物,R.sub.1为氢或较低烷基,与化学式为##STR3##其中R.sub.2为氢或氨基的保护基,R如上所定义,进行反应,当得到R.sub.1为较低烷基和/或R.sub.2为氨基保护基的反应产物时,用酸或碱处理,和/或还原性裂解它,(B)分解化学式为##STR4##其中A .crclbar.为含氟阴离子,R.sub.1和R.sub.2如上所定义,当得到R.sub.1为较低烷基和/或R.sub.2为氨基保护基的反应产物时,用酸或碱处理,和/或还原性裂解它,(C)用酸或碱处理化学式为##STR5##其中R'.sub.1为氢或较低烷基,R'.sub.2为氢或氨基的保护基,前提是R'.sub.1和R'.sub.2不能同时为氢原子,R如上所定义,并可选择将得到的化合物转化为其非毒性药用可接受的盐。1,8-萘啶化合物可用作抗菌剂。