反应详情

1-(3-Bromo-4-hydroxy-5-trifluoromethylphenyl)ethanone (O4.004; 6.8 g) was dissolved in methanol (50 ml) and admixed successively with DL-10-camphorsulfonic acid (111 mg) and trimethyl orthoformate (8 ml). After stirring at RT for 2 h, DMF (75 ml), potassium carbonate (4.98 g) and then slowly, while cooling with ice, iodomethane (3 ml) were added. After stirring at RT for 4 h, the reaction mixture was left to stand overnight and then admixed with n-heptane/water, and the organic phase was removed. The aqueous phase was extracted by shaking once more with n-heptane, and the combined organic phases were then dried over magnesium sulfate, filtered and concentrated. 7 g of the title compound were obtained in sufficient purity.

1. additionwere added
2. stirringAfter stirring at RT for 4 h
3. waitthe reaction mixture was left
4. waitto stand overnight
5. customthe organic phase was removed
6. extractionThe aqueous phase was extracted
7. stirringby shaking once more with n-heptane
8. dry with materialthe combined organic phases were then dried over magnesium sulfate
9. filtrationfiltered
10. concentrationconcentrated