A 1,8-naphthyridine compound of the formula ##STR1## wherein R is a vinyl or 2-fluoroethyl group, and R.sub.1 and R.sub.2 are the same or different and each represents a hydrogen atom or a lower alkyl group having 1 to 4 carbon atoms, and the esters thereof and salts thereof. For example, 7-(3-amino-1-pyrrolidinyl)-6-fluoro-1,4-dihydro-4-oxo-1-vinyl-1,8-naphthyr idine-3-carboxylic acid and nontoxic salts thereof, which are covered by the aforesaid compound, are useful as an antibacterial agent.
化合物为
1,8-萘啶类化合物,其
化学式为##STR1##其中R是
乙烯或2-
氟乙基基团,R.sub.1和R.sub.2相同或不同,每个代表氢原子或具有1到4个碳原子的低级烷基基团,其
酯类和盐类。例如,7-(3-
氨基-1-
吡咯烷基)-6-
氟-1,4-二氢-4-氧代-
1-乙烯基-
1,8-萘啶-3-羧酸及其无毒盐,这些化合物被用作抗菌剂。