Potassium Carbonate → Ethyl 5,7-dichloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylate

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Reaction Steps

6 g of ethyl 2-(2,4-dichloro-3,6-difluorobenzoyl)-3-cyclopropylamino-acrylate are heated in 100 ml of dimethylformamide at 150° C. with 2.75 g of potassium carbonate for 2.5 hours. The mixture is poured into 600 ml of ice-water and the precipitate is filtered off with suction, washed with water and dried. 5.2 g of ethyl 5,7-dichloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylate of melting point 227°-229° C. are obtained.

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