Tetrahydrofuran → 1-(2,4-Difluorophenyl)-6-fluoro-7-[3-(1,2,3-triazol-1-yl)pyrrolidin-1-yl]-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid

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Reaction Steps

A mixture of crude ethyl 1-(2,4-difluorophenyl) -6-fluoro-7-[3-(1,2,3-triazol-1-yl)pyrrolidin-1-yl]-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylate (150 mg, 0.31 mmol), THF (15 ml), NaOH (20 mg, 1.5 mmol) and water (15 ml) was heated under reflux for 3 h, cooled and the THF was evaporated. The residue was diluted with water, aqueous solution was acidified and the precipitated yellow solid was filtered, washed with water, dried in vac-oven at 50° C. This solid was washed with ether to get the pure compound. Yield: 50 mg (35.7%), m.p. 253° C. (dec). 1H NMR (TFA) δ: 2.85 (m, 2H), 3.70-4.50 (m, 4H), 5.80 (m, 1H), 7.20 (m, 2H), 7.60 (m, 1H), 8.25 (s, 1H), 8.57 (s, 1H), 8.62 (s, 1H), 9.20 (s, 1H).

Provenance & Evidence