Potassium Carbonate → 1-(2-Fluoroethyl)-6-fluoro-7-chloro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid

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Reaction Steps

To a stirred mixture of the above ester (1.35 g), potassium carbonate (1.73 g) and DMF (20 ml), 4.35 g of 2-fluoroethyl iodide was added and the mixture was stirred at 80° -90° C. for 9.5 hours. After the solvent evaporated off, the residue was extracted with dichromomethane, the dichloromethane layer was washed with water, and dried. The solvent was evaporated. The residue was added to 18% hydrochloric acid (20 ml) and refluxed for 3 hours. After the mixture cooled, the solid was filtered, washed with water, dried, and recrystallized from a mixture of DMF and ethanol to give 7-chloro-6-fluoro-1-(2-fluoroethyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (1.0 g).

Provenance & Evidence