反应详情

Lithium hydroxide (160 mg, 6.8 mmol) in water (10 mL) was added to a solution of (S)-methyl 2-(tert-butoxycarbonylamino)-3-(4-isopropoxyphenyl)propanoate in methanol (30 mL). The reaction was stirred for 24 h., and was concentrated under reduced pressure to remove the methanol. The remaining water layer was adjusted to pH=3 using 1 N HCl aqueous solution, and was extracted with ethyl acetate. The organic phase was washed with saturated brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure to give the crude product (2S)-2-[(tert-butoxycarbonyl)amino]-3-(4-isopropoxyphenyl)propanoic acid (1 g, 90%). Analytical LCMS (M+H-Boc)+: m/z=223.9.

1. concentrationwas concentrated under reduced pressure
2. customto remove the methanol
3. extractionwas extracted with ethyl acetate
4. washThe organic phase was washed with saturated brine
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure