1-Methylpiperazine → 1-Cyclopropyl-6-fluoro-8-methoxy-7-(4-methyl-1-piperazinyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

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A mixture of 1-cyclopropyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxo-3-quinolinecarboxylic acid (200 mg), N-methylpiperazine (140 mg) and anhydrous DMSO (3 ml) was stirred for 5 hours at 70° to 95° C. on an oil bath. The reacting mixture was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography eluting with chloroform-methanol-concentrated aqueous ammonia (20:6:1), the residue was recrystallized from methanol to give the title compound (50 mg) as colorless needles, mp 221°-222° C. (decompd.).

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