(-)-Mandelic acid → HCID 66705909, compound

Participants

Reaction Steps

To a stirred solution of the 80:20 mixture of (R)-2-amino-3-[(S)-1-(4-fluoro-phenyl)-ethoxy]-propan-1-ol & (S)-2-amino-3-[(S)-1-(4-fluoro-phenyl)-ethoxy]-propan-1-ol (2.94 g) in isopropanol (3 ml) was added a solution of D-(−)-mandelic acid (2.10 g) in isopropanol (2 ml). The solvent was evaporated and replaced with ethyl acetate to afford white crystals which were collected by filtration. The crystals were dissolved in hot EtOAc (65 ml) at 80° C. and the mixture was allowed to cool slowly. Crystals appeared on reaching a temperature of 70° C. and the suspension was then stirred at room temperature for 16 h. The crystals were collected by filtration and redissolved in hot EtOAc (80 ml) at 80° C. and the mixture was allowed to cool slowly until cyrstallisation started and then the resulting suspension was stirred at room temperature for 16 h. The crystals were collected by filtration to afford pure (R)-2-amino-3-[(S)-1-(4-fluoro-phenyl)-ethoxy]-propan-1-ol (R)-hydroxy-phenyl-acetate (3.08 g, 61%) as a white solid. 1H NMR (300 MHz, DMSO, δ ppm): 1.34 (d, J=6.3 Hz, 3H), 3.13 (m, 1H), 3.23 (m, 1H), 3.37 (m, 4H), 3.83 (m, 1H), 4.46 (q, J=6.3 Hz, 1H), 4.54 (s, 1H), 7.20 (m, 5H), 7.35 (m, 4H).

Provenance & Evidence