Methanol → Methyl 3-(4-aminophenyl)propanoate

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Reaction Steps

Thionyl chloride (14.6 ml, 200 mmol, 3.3 equiv) was added dropwise to a solution of dry methanol (60 ml, 1453 mmol, 24 equiv) at −10° C. After stirring for 10 minutes, 3-(4-aminophenyl)propanoic acid (10.0 g, 61 mmol) was added to give a yellow suspension. The solution stirred for 1 hour and was slowly warmed to room temperature. The resulting solution was concentrated to give a yellow solid. The solid was suspended in ethyl acetate, and NaHCO3 (aq.) was added until the salt dissolved fully. Solid sodium bicarbonate was added to give pH 8. The layers were separated and the organics were washed with brine (aq.). The resulting solution was dried over MgSO4, filtered, and concentrated to give a yellow solid (10.6 g, 98%). 1H NMR (300 MHz, CDCl3) 7.00 (d, J=8.3 Hz, 2H), 6.63 (d, J=8.3 Hz, 2H), 3.67 (s, 3H), 3.59 (bs, NH2, 2H), 2.85 (t, J=7.6 Hz, 2H), 2.58 (t, J=8.3 Hz, 2H). 13C NMR (300 MHz, CDCl3) 173.8, 144.9, 130.7, 129.3, 115.5, 51.8, 36.4, 30.4. M.S. (ESI) m/z=180.102 (M+H).

Provenance & Evidence