反应详情

A mixture of (2S,3R)-2-(tert-butoxycarbonylamino)-3-hydroxy-3-(4-methoxyphenyl)propanoate (1.44 g, 4.44 mmol) and LiOH—H2O (280 mg, 6.66 mmol) in MeOH/THF (30 mL, 1:1) was stirred for 1 h at ambient temperature. EtOAc/water (30 mL/50 mL) was added and the two phases were separated. The aqueous phase was washed with EtOAc (30 mL×2) then acidified with dilute HCl to pH=5. The resulting mixture was extracted with EtOAc (50 mL×2). The organics were combined, dried over anhydrous sodium sulfate, and concentrated to afford (2S,3R)-2-(tert-butoxycarbonylamino)-3-hydroxy-3-(4-methoxyphenyl)propanoic acid (0.90 g, 65% yield) as a colorless solid.

1. customthe two phases were separated
2. washThe aqueous phase was washed with EtOAc (30 mL×2)
3. extractionThe resulting mixture was extracted with EtOAc (50 mL×2)
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated