反应详情

温度

-60 °C

To a solution of 7.36 g (184 mmol) of NaH (60%) in 200 ml of THF was added 15.68 g (184 mmol) of 2-oxopyrrolidine with stirring under ice-cooling, and further the mixture was stirred at room temperature for 1 hr. until H2 gas ceased to evolve. The reaction solution was added to a solution of 29.7 g (190 mmol) of phenyl chloroformate in 100 ml of THF cooled at -60° C. and then stirred at room temperature for 4 hr. The reaction solution was poured into ice water, and then extracted with ethyl acetate. After drying, the solvent was removed by evaporation. When the crystalline residue was recrystallized from CH2Cl2 -ether, 37.8 g of the objective compound (II) melting at 120.0°-121.5° C. was obtained as crystals. Yield: 84.0%.

1. temperaturecooling
2. stirringfurther the mixture was stirred at room temperature for 1 hr
3. stirringstirred at room temperature for 4 hr
4. extractionextracted with ethyl acetate
5. customAfter drying
6. customthe solvent was removed by evaporation
7. customWhen the crystalline residue was recrystallized from CH2Cl2 -ether