Hydrochloric Acid → 8-Fluoro-3-(piperidin-4-yl)quinolin-2(1H)-one hydrochloride

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tert-Butyl 4-(1-(3-fluoro-2-pivalamidophenyl)-1-hydroxy-3-methoxy-3-oxopropan-2-yl)piperidine-1-carboxylate (16.4 mmol, 7.86 g) was dissolved in methanol (20 mL). Water (45 mL) was added to the mixture followed by concentrated hydrochloric acid (183 mmol, 15 mL). Reaction was heated to reflux and held for 2.5 hours. Reaction mixture was concentrated in vacuo. Residue was dissolved in ethanol (50 mL) then concentrated in vacuo. Residue was crystallized from ethanol. Solids were filtered off, washed with cold ethanol then dried in vacuo. Title compound was obtained as white solid in 83% yield. 1H NMR (500 MHz, DMSO-d6): δ=11.85 (s, 1H), 8.98 (m, 1H), 8.85 (m, 1H), 7.75 (s, 1H), 7.54 (d, J=7.63, 1H), 7.36 (dd, J1=10.22, J2=8.09, 1H), 7.21-7.11 (m, 1H), 3.41-3.29 (m, 2H), 3.14-2.94 (m, 3H), 2.02 (d, J=13.43, 2H), 1.88-1.71 (m, 2H). MS m/e (M+H)+=247.2.

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