Sodium Acetate → 4-Acetoxy-6-fluoro-naphthalene-2-carboxylic acid methyl ester

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To a solution of 2-(4-fluoro-benzylidene)-succinic acid 1-methyl ester (2 g, 8.4 mmol) in acetic anhydride (10 mL) was added sodium acetate (0.83 g, 10.1 mmol). After being heated at reflux for 6 hours, the mixture was concentrated in vacuo. The residue was dissolved in 1 N hydrochloric acid (20 mL). The aqueous solution was extracted with ethyl acetate (15 mL×3). The combined organic layers were dried over sodium sulfate, and concentrated in vacuo. The residue was purified by column chromatography (10-20% ethyl acetate in petroleum ether) to afford 4-acetoxy-6-fluoro-naphthalene-2-carboxylic acid methyl ester (1.1 g, 50%) as a white solid. 1H NMR (400 MHz, CDCl3) δ ppm 8.52 (s, 1H), 8.00 (dd, J=9.09, 5.56 Hz, 1H), 7.89 (s, 1H), 7.50 (dd, J=9.85, 2.53 Hz, 1H), 7.37 (td, J=8.59, 2.53 Hz, 1H), 3.99 (s, 3H), 2.49 (s, 3H).

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