反应详情

Cool a solution of 6-(1-ethyl-propenyl)naphthalene-2-carboxylic acid methyl ester (0.74 g, 2.75 mmol) and o-cresol (2.0 mL, 19.4 mmol) in CH2CL2 (20 mL) to −78° C.; dropwise add BF3-OEt2 (1.22 mL, 9.6 mmol). Remove the cooling bath and stir the reaction at RT for 16 h. Quench the reaction with ice water; then dilute with EtOAc (200 mL). Wash the resulting mixture twice with brine, dry over Na2SO4, filter, and concentrate the filtrate. Purify the product using medium pressure silica gel chromatography (100% hex to 25:75 EtOAc:hex) to give the title compound as a white solid (0.87 g, 87%). MS (ES) in/e 363 (M+1).

1. customRemove the cooling bath
2. customthe reaction at RT for 16 h
3. customQuench
4. customthe reaction with ice water
5. washWash the resulting mixture twice with brine
6. dry with materialdry over Na2SO4
7. filtrationfilter
8. concentrationconcentrate the filtrate
9. customPurify the product