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

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반응 단계

A mixture of 6 g (0.02 mol) of ethyl 6-fluoro-7-(pyrrol-1-yl)-4-hydroxyquinoline-3-carboxylate and 5.6 g (0.04 mol) of potassium carbonate in 80 ml of dimethylformamide is heated for 30 minutes at 60° C. and left to cool, 8.5 g (0.042 mol) of 2,4-dinitrophenylhydroxylamine are added, the mixture is kept for 24 hours at room temperature and poured into 200 ml of a water/ice mixture, and the precipitate formed is filtered off, washed with water, dried in a desiccator and recrystallized from dimethylformamide to give 1.5 g of a solid melting at 276°-279° C.

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