反应详情

A mixture of 50.0 g (0.27 mole) of 2-hydroxy-5-methoxybenzoic acid, methyl ester, 88.0 g (0.64 mole) of anhydrous potassium carbonate, and 25.4 ml (46.4 g, 0.30 mole) of methyl bromoacetate in 300 ml of N,N-dimethylformamide is stirred at room temperature for 24 hours. The reaction mixture is added to 1100 g of ice/water, stirred for 1 hour, and the precipitated crude product is filtered and washed with water. Recrystallization from aqueous methanol yields 54.7 g (78% yield) of analytically pure 5-methoxy-2-(2-methoxy-2-oxoethoxy) benzoic acid, methyl ester, mp 82°-85° C.

1. stirringstirred for 1 hour
2. customthe precipitated crude product
3. filtrationis filtered
4. washwashed with water
5. customRecrystallization from aqueous methanol