7-azaisoindolinyl-quinolone-carboxylic acid derivatives

Quinolone- carboxylic acid derivatives of the formula (I) ##STR83## in which X.sup.1 represents halogen,

• X.sup.2 represents hydrogen, amino, alkylamino having 1 to 4 carbon atoms, dialkylamino having 1 to 3 carbon atoms per alkyl group, hydroxyl, alkoxy having 1 to 4 carbon atoms, mercapto, alkylthio having 1 to 4 carbon atoms, arylthio, halogen or methyl,
• R.sup.1 represents alkyl having 1 to 4 carbon atoms, alkenyl having 2 to 4 carbon atoms, cycloalkyl having 3 to 6 carbon atoms, 2-hydroxyethyl, 2-fluoroethyl, methoxy, amino, methylamino, ethylamino, dimethylamino, or phenyl which is optionally substituted by 1 or 2 fluorine atoms,
• R.sup.2 represents hydrogen, or represents alkyl which has 1 to 4 carbon atoms and which is optionally substituted by hydroxyl, methoxy, amino, methylamino or dimethylamino, or represents (5-methyl-2-oxo-1,3-dioxol-4-yl)-methyl,
• Z represents a radical of the structure ##STR84## where R.sup.3 represents hydrogen, optionally hydroxyl-substituted C.sub.1 -C.sub.3 -alkyl, alkoxycarbonyl having 1 to 4 C atoms in the alkoxy moiety or C.sub.1 -C.sub.3 -acyl,
• R.sup.4 represents hydrogen, hydroxyl, ##STR85## hydroxymethyl or ##STR86## where R.sup.6 represents hydrogen or methyl, R.sup.5 represents hydrogen, C.sub.1 -C.sub.3 -alkyl or cyclopropyl and
• A represents C--R.sup.7 where
• R.sup.7 represents H, halogen, methyl, hydroxyl or methoxy, with the proviso that A cannot be CH or CF when
• Z represents ##STR87## and their pharmaceutically usable hydrates and acid addition salts and alkali metal salts, alkaline earth metal salts, silver salts and guanidinium salts.