Acetic Anhydride → 4-((5-Fluoropyridin-2-yl)methoxy)pyridin-2(1H)-one

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4-((5-Fluoropyridin-2-yl)methoxy)pyridine 1-oxide (1.76 g, 7.99 mmol) was heated to 140° C. in acetic anhydride (80 mL) for 5 h. The mixture was concentrated and then heated at 80° C. for 1 h in a mixture of MeOH (20 mL) and aqueous 1 N NaOH (15 mL). The resulting black solution was concentrated to a volume of 15 mL, and the solid was filtered off, rinsed with CH2Cl2 and dried under vacuum to provide the title compound (1.29 g, 73%) as a yellow solid: 1H NMR (500 MHz, DMSO-d6) δ 11.12 (s, 1H), 8.59 (d, J=2.9 Hz, 1H), 7.79 (ddd, J=8.7, 8.7, 2.9 Hz, 1H), 7.60 (dd, J=8.7, 4.5 Hz, 1H), 7.26 (d, J=7.3 Hz, 1H), 5.95 (dd, J=7.4, 2.6 Hz, 1H), 5.78 (d, J=2.5 Hz, 1H), 5.12 (s, 2H).

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