反应详情

Dimethyl sulphate (2.3 ml) was added to a suspension of ethyl 3-bromo-2-hydroxy-6-methylbenzoate (Intermediate 92, 5.19 g) and potassium carbonate (5.64 g) in dry acetone (70 ml) and the resultant mixture was stirred and heated at reflux for 2 hours. After cooling to room temperature, the mixture was filtered and the filtrate was evaporated to dryness. The residue was dissolved in ether and washed with NaHCO3 (saturated aqueous solution), dried (Na2SO4) and filtered. The filtrate was evaporated to dryness to give crude ethyl 3-bromo-2-methoxy-6-methylbenzoate (5.4 g) as a colourless oil.

1. temperatureheated
2. temperatureat reflux for 2 hours
3. filtrationthe mixture was filtered
4. customthe filtrate was evaporated to dryness
5. dissolutionThe residue was dissolved in ether
6. washwashed with NaHCO3 (saturated aqueous solution)
7. dry with materialdried (Na2SO4)
8. filtrationfiltered
9. customThe filtrate was evaporated to dryness