反应详情

To a solution of S-benzyl-N-(3-benzylthio-2,2-dimethylpropionyl)-L-cysteine (18.0 g) in liquid ammonia(250 ml), metallic sodium (5.0 g) cut into small pieces was added. To this solution, ammonium chloride was added and then liquid ammonia was evaporated. To the residue, water was added, and the solution was washed with ethyl acetate. The aqueous layer was acidified with 6N hydrochloric acid and extracted with ethyl acetate. The organic layer was washed with saturated sodium chloride solution, dried over anhydrous sodium sulfate and concentrated in vacuo. The oily residue was purified by a silica gel column chromatography and recrystallized with a mixture of ethyl acetate and cyclohexane to give 7.1 g(69.6%) of the titled compound. The physical data were identical with those of the compound obtained in Example 2.

1. additionwas added
2. customliquid ammonia was evaporated
3. additionTo the residue, water was added
4. washthe solution was washed with ethyl acetate
5. extractionextracted with ethyl acetate
6. washThe organic layer was washed with saturated sodium chloride solution
7. dry with materialdried over anhydrous sodium sulfate
8. concentrationconcentrated in vacuo
9. customThe oily residue was purified by a silica gel column chromatography
10. customrecrystallized with a mixture of ethyl acetate and cyclohexane