反应详情

Under ice-cooling, to 10 ml of an anhydrous tetrahydrofuran solution containing 299 mg (1.84 mmol) of (2S-trans)-3-butyl-oxirane carboxylic acid.dicyclohexylammonium salt was added 2 ml of an anhydrous tetrahydrofuran solution containing 222 mg (1.84 mmol) of pivaloyl chloride, and the resulting mixture was stirred at the same temperature for 15 minutes. Moreover, the temperature of the reaction mixture was returned to room temperature and the mixture was stirred for 2 hours. After filtering off insoluble materials in the reaction mixture, 187 mg (1.84 mmol) of triethylamine was added to the filtrate under ice-cooling, and then, 397 mg (1.84 mmol) of L-phenylalanine methyl ester hydrochloride was added to the mixture, and the resulting mixture was stirred at room temperature for 2 hours. Under reduced pressure, the reaction mixture was concentrated and ethyl acetate was added to the concentrate, and the resulting mixture was washed successively with a 10% aqueous potassium hydrogen sulfate solution, a saturated aqueous sodium hydrogen carbonate solution and then a saturated NaCl solution. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure to obtain 558 mg (Yield: 100%) of the title compound.

1. customwas returned to room temperature
2. stirringthe mixture was stirred for 2 hours
3. additionwas added to the filtrate under ice-
4. temperaturecooling
5. stirringthe resulting mixture was stirred at room temperature for 2 hours
6. concentrationUnder reduced pressure, the reaction mixture was concentrated
7. additionethyl acetate was added to the concentrate
8. washthe resulting mixture was washed successively with a 10% aqueous potassium hydrogen sulfate solution
9. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
10. customthe solvent was removed under reduced pressure