Nicotinic Acid → 3-Quinolinecarboxylic acid, 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-, compd. with 3-pyridinecarboxylic acid (1:1)

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Reaction Steps

10 g of Norfloxacin were added to 20 ml of ethanol, the mixture obtained was then stirred and heated to reflux. 4.2 g of nicotinic acid, previously dissolved in 5 ml of hot ethanol, were added in one portion to said mixture and the resulting suspension was heated to reflux, upon which all solids dissolved. After a short time at reflux the adduct began to separate. The mixture was stirred, cooled to room temperature and finally in an ice bath to yield the nicotinic acid-Norfloxacin 1:1 adduct in 88% yield; m.p. 232°-233° C.

Provenance & Evidence