反应详情

953 mg of cesium carbonate (2.92 mmol) was added to a solution of 1.44 g of N-{(S)-2-[2,2-dimethyl-4-(5-fluoro-2-methylphenyl)-5-oxopiperazin-1-yl]-1-[(2S,4S)-4-isopropyl-5-oxotetrahydrofuran-2-yl]ethyl}-2-nitrobenzenesulfonamide obtained in Example (70e) (2.43 mmol) and 0.52 ml of thiophenol (content: 95%) (4.87 mmol) in acetolitrile (25 ml) under a nitrogen atmosphere at room temperature, and the mixture was stirred at the same temperature for two hours. Brine was added to the reaction mixture, followed by extraction with methylene chloride. Then, the organic layer was dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (elution solvent:methylene chloride/methanol=20/1-10/1). 211 mg of sodium bicarbonate (2.51 mmol) and 549 mg of di-t-butyl dicarbonate (2.51 mmol) were added to a solution of 4-{(S)-2-amino-2-[(2S,4S)-4-isopropyl-5-oxotetrahydrofuran-2-yl]ethyl}-5,5-dimethyl-1-(5-fluoro-2-methylphenyl)piperazin-2-one obtained above in a mixture of ethyl acetate (11 ml) and water (11 ml), and the mixture was stirred at room temperature for four hours. Brine was added to the reaction mixture, followed by extraction with methylene chloride. Then, the organic layer was dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (elution solvent:methylene chloride/ethyl acetate=5/1-3/1) to obtain 996 mg of the title compound (yield: 93%).

1. extractionfollowed by extraction with methylene chloride
2. dry with materialThen, the organic layer was dried over anhydrous magnesium sulfate
3. filtrationAfter filtration
4. customthe solvent was evaporated under reduced pressure
5. customthe residue was purified by silica gel column chromatography (elution solvent:methylene chloride/methanol=20/1-10/1)
6. stirringthe mixture was stirred at room temperature for four hours
7. extractionfollowed by extraction with methylene chloride
8. dry with materialThen, the organic layer was dried over anhydrous magnesium sulfate
9. filtrationAfter filtration
10. customthe solvent was evaporated under reduced pressure
11. customthe residue was purified by silica gel column chromatography (elution solvent:methylene chloride/ethyl acetate=5/1-3/1)