Potassium Carbonate → Ethyl 5,7-dichloro-6-fluoro-1-(2,4-difluorophenyl)-1,4-dihydro-4-oxo-3-quinolinecarboxylate

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Reaction Steps

43.6 g of ethyl 2-(2,4-dichloro-3,6-difluorobenzoyl)-3-(2,4-difluorophenylamino)-acrylate are heated in 260 ml of dimethylformamide at 150° C. with 15.2 g of potassium carbonate for 2.5 hours. The mixture is poured into 1 liter of ice-water and the precipitate is filtered off with suction, washed with water and dried. 38.6 g of ethyl 5,7-dichloro-6-fluoro-1-(2,4-difluorophenyl)-1,4-dihydro-4-oxo-3-quinolinecarboxylate are obtained.

Provenance & Evidence