Sodium Fluoride → Ethyl 5,6,7,8-tetrafluoro-1-(2,4-difluorophenyl)-1,4-dihydro-4-oxo-3-quinolinecarboxylate

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반응 단계

A mixture of 135.4 g of ethyl 2-(2,3,4,5,6-pentafluorobenzoyl)-3-(2,4-difluorophenylamino)acrylate, 20.6 g of sodium fluoride and 300 ml of anhydrous dimethylformamide is heated at 140°-150° C. for 3 hours. The suspension is poured hot onto 2 kg of ice and the precipitate is filtered off with suction, washed with water and dried. 122 g of the title compound of melting point 160°-162° C. are obtained.

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