Water → 1-Cyclopropyl-6,7-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

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Reaction Steps

A solution of 6,8 g of 1-cyclopropyl-6,7-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, ethyl ester in a mixture of 46 ml of glacial acetic acid, 35 ml of water and 4.5 ml of concentrated sulfuric acid was refluxed for 1.5 hours. The resulting suspension was cooled in an ice bath, the solid collected, washed with cold water, dried and recrystallized from hot dimethylformamide, giving 5 g of the desired compound, mp 288°-290° C.

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