Ammonia → 3-Quinolinecarboxylic acid, 1,4-dihydro-5-amino-1-cyclopropyl-6-fluoro-4-oxo-7-(1-piperazinyl)-

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Reaction Steps

1-Cyclopropyl-5,6-difluoro-7-(1-piperazinyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid and 28% aqueous ammonia were heated at 100° C. for 48 hours in a sealed tube. The reaction mixture was concentrated to dryness under reduced pressure. The residue was dissolved in a 1N aqueous solution of sodium hydroxide, and neutralized with a 10% aqueous solution of acetic acid. The crystals which precipitated were collected by filtration to give 5-amino-1-cyclopropyl-6-fluoro-7-(1-piperazinyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid. m.p. 214°-216° C.

Provenance & Evidence