Potassium Carbonate → Ethyl 6-fluoro-7-(pyrrol-1-yl)-1-fluoroethyl-4-oxo-1,4-dihydroquinoline-3-carboxylate

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반응 단계

A mixture of 3.2 g (0.011 mol) of ethyl 6-fluoro-7-(pyrrol-1-yl)-4-hydroxyquinoline-3-carboxylate and 4 g (2.5×0.011 mol) of potassium carbonate in 20 ml of dimethylformamide is heated for 30 minutes at 60° C. and left to cool, 7 g (5×0.011 mol) of bromofluoroethane are added, the mixture is kept for 7 hours at 80° C., left to cool and poured into a water/ice mixture, and the precipitate formed is filtered off, washed with water and recrystallized from a dimethylformamide/water mixture (1:1) to give 2.35 g of a solid melting at 231°-234° C.

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