Methanol → 3-Acetyl-5-(dipropylcarbamoyl)benzoic acid

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Reaction Steps

To a solution of methyl 3-acetyl-5-(dipropylcarbamoyl)benzoate (38 mg, 0.125 mmol) in a mixture of THF (0.1 mL), MeOH (0.2 mL) and H2O (0.5 mL), was added LiOH (8.9 mg, 0.374 mmol) and the mixture was stirred at room temperature for 1 h. The mixture was concentrated and partitioned between ethyl acetate and H2O. The aqueous layer was washed with ethyl acetate twice and acidified with 1N HCl solution to pH around 2˜3. The aqueous layer was extracted with ethyl acetate 3 times and the combined organic layers were dried over sodium sulfate and concentrated under vacuum to give the title compound (35 mg, 97.2% yield): 1H NMR (CD3OD, 500 MHz) δ ppm 0.78 (3H, m), 1.03 (3H, t, J=5 Hz), 1.62 (2H, m), 1.77 (2H, m), 2.69 (3H, s), 3.23 (2H, m), 3.52 (2H, m), 8.17 (1H, m), 8.21 (1H, m), 8.68 (1H, m). HPLC retention time: 1.687 min (method A). MS (ESI) (M+H)+ 292.23.

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