the title compounds ( 28-56 ) with an amino- and/or hydroxy-substituted cyclic amino group at c-7 were prepared with 1-substituted 7-chloro- , 7- ( ethylsulfonyl ) - , and 7- ( tosyloxy ) -6-fluoro-1,4-dihydro-4-oxo-1,8-naphthyridine-3- carboxylic acids and their ethyl esters ( 3-7 ) with cyclic amines such as 3-aminopyrrolidine .
C0007066
carboxylic acids
C0014898
esters