反应详情

To a suspension of {(R)-[4-(2-tert-butoxy-ethoxy)-phenyl]-[(S)-1-(5-iodo-1H-benzoimidazol-2-yl)-2-phenyl-ethylcarbamoyl]-methyl}-carbamic acid tert-butyl ester (260 mg, 0.36 mmol) in 6:1 v/v acetonitrile/p-dioxane (14 mL) at 0° C. under an atmosphere of nitrogen was added 4.0 M hydrogen chloride in p-dioxane (420 μL, 1.68 mmol) and the resulting solution stirred at room temperature for 1 hour. Additional 4.0 M hydrogen chloride (420 μL, 1.68 mmol) was added and stirring continued for 30 minutes. The solvent was removed in vacuo and the residue was basified with saturated aqueous sodium hydrogen carbonate solution. The aqueous mixture was extracted with ethyl acetate (2×25 mL), washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo to give (R)-2-amino-2-[4-(2-tert-butoxy-ethoxy)-phenyl]-N-[(S)-1-(5-iodo-1H-benzoimidazol-2-yl)-2-phenyl-ethyl]-acetamide which was used in the subsequent step without further purification (210 mg, 94%).

1. stirringstirring
2. waitcontinued for 30 minutes
3. customThe solvent was removed in vacuo
4. extractionThe aqueous mixture was extracted with ethyl acetate (2×25 mL)
5. washwashed with brine
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo