Trifluoroacetic anhydride → N-(7-(2-chlorophenyl)-5-oxo-5,6-dihydro-2,6-naphthyridin-3-yl)cyclopropanecarboxamide

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Reaction Steps

To a slurry of 3-(2-chlorophenyl)-7-(cyclopropanecarboxamido)-2,6-naphthyridine 2-oxide (50 mg, 0.1 mmol) in tetrahydrofuran (0.5 mL) at 0° C. was added trifluoroacetic anhydride (0.04 mL, 0.29 mmol) dropwise over 2 minutes. The mixture was allowed to warm to room temperature and stir for 2 hours. The reaction mixture was diluted with ethyl acetate (50 mL) and washed with saturated sodium bicarbonate solution (10 mL). The organic layer was separated, dried over sodium sulfate, filtered, and evaporated in vacuo to afford a residue that was purified by reverse phase HPLC (5-85% acetonitrile in water with 0.1% formic acid over 14 min) to afford the title compound as a yellow solid (10 mg, 20%). 1H NMR (400 MHz, DMSO) δ 11.10 (s, 1H), 10.33 (s, 1H), 9.51 (s, 1H), 8.86 (s, 1H), 8.54 (s, 1H), 7.62-7.52 (m, 1H), 7.53-7.38 (m, 3H), 2.08 (m, 1H), 0.88 (m, 4H). LCMS (Method E): RT=3.759 min, M+H+=340.0.

Provenance & Evidence