反应详情

To a solution of (2R,3S)-3-(benzyloxy)-2-(tert-butoxycarbonylamino)-4,4,4-trifluorobutanoic acid (1.56 g, 4.2 mmol) in EtOAc (30 mL) was added EtOAc saturated with hydrogen chloride (30 mL) at 0° C. Then, the mixture was stirred at room temperature for 1.5 h. After concentration of the reaction mixture to about 15 mL, the white solid was collected by filtration and washed with EtOAc, dried in vacuum to give the title compound (2R,3S)-2-amino-3-(benzyloxy)-4,4,4-trifluorobutanoic acid hydrochloride salt (1.06 g, 84% for two steps). 1H NMR (400 MHz, CD3OD, δ in ppm) 7.32˜7.44 (m, 5H), 4.86 (d, J=2.0 Hz, 2H), 4.70 (dq, J=3.6, 6.6 Hz, 1H), 4.50 (d, J=3.6 Hz, 1H).

1. filtrationAfter concentration of the reaction mixture to about 15 mL, the white solid was collected by filtration
2. washwashed with EtOAc
3. customdried in vacuum