反应详情

To a mixture of anisaldehyde (15.6 g, 115 mmol) and ethylamine (2.0M in THF, 87 mL, 174 mmol) in 1,2-dichloroethane (450 mL) was added glacial acetic acid (10.0 mL, 174 mmol) under nitrogen atmosphere. The reaction mixture was stirred at room temperature for 30 min and then cooled to 0° C. with ice bath. NaBH(OAc)3 (36.9 g, 174 mmol) was added portionwise and the reaction mixture was stirred at room temperature overnight. The mixture was concentrated and the residue was diluted with a basic solution (10 g NaOH in 100 mL of water) to make the solution slightly basic. This aqueous layer was extracted with ether. The combined extracts were washed with water, brine, dried and concentrated. The residue was chromatographed on silica gel (elution with 5% MeOH in CH2Cl2 and then 50% MeOH in CH2Cl2 containing 4% Et3N) to afford the product (11.2 g, 59% yield) as an oil.

1. temperaturecooled to 0° C. with ice bath
2. stirringthe reaction mixture was stirred at room temperature overnight
3. concentrationThe mixture was concentrated
4. additionthe residue was diluted with a basic solution (10 g NaOH in 100 mL of water)
5. extractionThis aqueous layer was extracted with ether
6. washThe combined extracts were washed with water, brine
7. customdried
8. concentrationconcentrated
9. customThe residue was chromatographed on silica gel (
10. washelution with 5% MeOH in CH2Cl2