Water → (S)-b-Amino-4-methylbenzenepropanol

Participants

Reaction Steps

A mixture of lithium aluminum hydride (254 mg, 6.696 mmol) in THF (20 mL) was heated at reflux for 1 h, then cooled in an ice bath. (S)-4-Methylphenylalanine (500 mg, 2.79 mmol) was added portionwise and the resultant mixture was heated at reflux for 14 h. The excess lithium aluminum hydride was decomposed by successive addition of H2O (1 mL), 10% aq. NaOH (10 mL) and H2O (2.5 mL). The mixture was filtered and the solid was washed with THF. The filtrate was concentrated in vacuo and the residue was dissolved in CHCl3 (50 mL), washed with 5% aq. NaOH (25 mL), H2O (25 mL) and brine (25 mL), dried (MgSO4), filtered, and concentrated in vacuo to afford (2S)-2-amino-3-(4-methylphenyl)propan-1-ol as an off-white solid. 1H NMR (CD3OD, 500 MHz) δ 7.13-7.09 (m, 4H), 3.52 (dd, J=10.7, 4.6 Hz, 1H), 3.36 (dd, J=10.7, 6.9 Hz, 1H), 3.04-2.99 (m, 1H), 2.73 (dd, J=13.5, 6.2 Hz, 1H), 2.53 (dd, J=13.5, 7.7 Hz, 1H), 2.30 (s, 3H).

Provenance & Evidence