| 摘要 |
<p>The prevent invention provides a 1,8-naphthyridine compound of the formula wherein R is hydrogen, methyl, ethyl or propyl, and a nontoxic pharmaceutically acceptablo 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 IMG> wheroin Y is halogen, lower alkoxy, lower alkylthio, lower alkylsulfinyl, lower alkylsulfonyl, lower alkyloulfonyloxy or arylsulfonyloxy, and R1 is hydrogen or lower alkyl, with a compound of the formula </p> |
