Dimethylamine → 2-methoxy-N,N-dimethyl-1-naphthamide

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To a solution of 2-methoxynaphthoic acid (268 mg, 1.3 mmol) in dry dichloromethane (5 mL) at 0° C. under a N2 atmosphere was added oxalyl chloride (0.8 mL of a 2M solution in dichloromethane, 1.6 mmol) and 4 drops of N,N-dimethyl formamide. The mixture was stirred at 0° C. for 20 minutes, allowed to warm to room temperature, and stirred for one hour. This solution was added dropwise to a solution of dimethylamine (3.3 mL, 6.5 mmol) and triethylamine (0.92 mL, 6.5 mmol) in tetrahydrofuran (20 mL) and H2O (2 mL), and stirring was continued at room temperature under a N2 atmosphere for 16 hours. The mixture was concentrated in vacuo and the product was purified by column chromatography using 20% ethyl acetate in hexane. The title compound was obtained as a colorless oil (385 mg, 92%). 1H NMR (300 MHz, CDCl3): δ 7.85 (d, 1H), 7.78 (d, 1H), 7.61 (d, 1H), 7.47 (t, 1H), 7.36 (t, 1H), 7.30 (d, 1H), 3.96 (s, 3H), 3.27 (s, 3H), 2.81 (s, 3H). MS (ESI) m/z=230 [M+H].

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