申请人:Koei Chemical Co., Ltd.
公开号:US04182880A1
公开(公告)日:1980-01-08
1,8-Naphthyridine compounds and a process for preparing chelated 1,8-naphthyridine derivatives and 1,8-naphthyridine derivatives which are pharmacautically useful compounds. Chelated 1,8-naphthyridine derivatives of the general formula [I]: ##STR1## wherein X and Y are independently a lower alkyl group, are prepared by subjecting a compound of the general formula [II]: ##STR2## wherein X and Y are as defined above and R is a lower alkyl group, to ring-closing condensation in the presence of boron trifluoride and/or a boron trifluoride complex at an elevated temperature, and 1,8-naphthyridine derivatives of the general formula [III]: ##STR3## wherein X and Y are as defined above, are prepared by treating the chelated 1,8-naphthyridine derivatives with water and/or an alcohol. The desired products can be readily obtained in high yields. The chelated compounds are novel compounds.
1,8-萘啶化合物及其制备螯合1,8-萘啶衍生物和具有药用价值的1,8-萘啶衍生物的方法。通过在升高温度下在三氟化硼和/或三氟化硼配合物的存在下,将通式[II]的化合物:##STR2## 其中,X和Y独立地是较低的烷基,经过环闭合缩合反应,制备通式[I]的螯合1,8-萘啶衍生物:##STR1## 其中,X和Y如上所述,R是较低的烷基。通过将螯合1,8-萘啶衍生物与水和/或醇处理,制备通式[III]的1,8-萘啶衍生物:##STR3## 其中,X和Y如上所述。所需的产物可以轻松地高产率地获得。螯合化合物是新型化合物。