quinolones were synthesized as a continuation of a research project of 1-(2- fluorocyclopropyl)-quinolones by considering stereochemical and physicochemical properties of the molecule. Absolute configurations of the l-(cis-2-fluorocyclopropyl) moiety and the 747-amin0-5-azaspiro-[2.4] heptan-5-yl) moiety were determined by X-ray crystallographic analysis. Stereochemical structure-activity relationship studies indicated ...