Hydrochloric Acid → 1-(6-Amino-3,5-difluoropyridin-2-yl)-5,6,7,8-tetrafluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid

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Reaction Steps

To 2 ml of the mixed solution (1:1) of 4N hydrochloric acid and acetic acid was added 320 mg of ethyl 1-(6-amino-3,5-difluoropyridin-2-yl)-5,6,7,8-tetrafluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate, and the mixture was heated under reflux for 3 hours with stirring, and allowed to cool. The precipitate was collected by filtration, and washed with ethanol to obtain 280 mg of the title compound as a colorless powder.

Provenance & Evidence