Water → 2,2-Dimethylpropionic acid (R)-2-t-butoxycarbonylamino-3-(4-methoxy-benzylsulfanyl)-propyl ester

[(R)-2-hydroxy-1-(4-methoxy-benzylsulfanylmethyl)-ethyl]-carbamic acid t-butyl ester (71.3 g, 227.9 mmol) prepared in Step C was dissolved in dichloromethane (300 mL). Triethylamine (58 mL, 414.4 mmol) and trimethylacetic acid chloride (28 mL, 227.9 mmol) were added thereto, and the mixture was stirred for 6 h at 0°. Water was added to quench the reaction. The reaction mixture was extracted with ethyl acetate, washed with saturated aqueous sodium chloride solution, and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was purified by column chromatography to give the title compound (81.0 g, Yield 95%).

1. customto quench
2. customthe reaction
3. extractionThe reaction mixture was extracted with ethyl acetate
4. washwashed with saturated aqueous sodium chloride solution
5. dry with materialdried over anhydrous magnesium sulfate
6. customThe solvent was removed under reduced pressure
7. customthe residue was purified by column chromatography

ORD 기록

ord-eee1ca0bf13f4883b6ff6f157678529f

출처 데이터셋

uspto-grants-2012_07

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US08222414B2