反应详情

温度

-78 °C

To a solution of benzyl 3-cyano-2-methylphenylcarbamate (6.41 g, 24.07 mmol) in tetrahydrofuran (250 mL) at −78° C. was added DIBAL-H in dichloromethane (96 mL, 96 mmol) over 1 hr. The mixture was stirred at −78° C. for 45 min and then at room temperature for 5 hr. It was poured into ice cold water (300 mL) and the resulting mixture was stirred at room temperature for 30 min. The mixture was filtered through CELITE®, and the filtrate was concentrated to remove most of the THF. The remaining aqueous solution was extracted with ethyl acetate (4×150 mL). The combined extract was dried over anhydrous MgSO4. Removal of solvent under vacuum provided the desired product (5.65 g, 20.98 mmol, 87% yield) as a pale yellow solid.

1. waitat room temperature for 5 hr
2. stirringthe resulting mixture was stirred at room temperature for 30 min
3. filtrationThe mixture was filtered through CELITE®
4. concentrationthe filtrate was concentrated
5. customto remove most of the THF
6. extractionThe remaining aqueous solution was extracted with ethyl acetate (4×150 mL)
7. extractionThe combined extract
8. dry with materialwas dried over anhydrous MgSO4
9. customRemoval of solvent under vacuum