反应详情

温度

50 °C

4-Benzyl-1,2-dihydro-5-isopropyl-3H-pyrazol-3-one (2.00 g) was dissolved in N,N-dimethylformamide (5 mL) at room temperature. N-(Benzyloxycarbonyloxy)succinimide (2.42 g) was added to the solution. The mixture was heated to 50° C. and then stirred for 16 hours. After the addition of water (20 mL) and ethyl acetate (20 mL) to the reaction mixture, the aqueous layer was separated, and the organic layer was washed with water. The obtained organic layer was concentrated under reduced pressure, and the residue was purified by column chromatography on silica gel (eluent: ethyl acetate/dichloromethane=1/3 to 1/1) to give 1-benzyloxycarbonyl-4-benzyl-1,2-dihydro-5-isopropyl-3H-pyrazol-3-one (1.15 g).

1. customthe aqueous layer was separated
2. washthe organic layer was washed with water
3. concentrationThe obtained organic layer was concentrated under reduced pressure
4. customthe residue was purified by column chromatography on silica gel (eluent: ethyl acetate/dichloromethane=1/3 to 1/1)