反应详情

温度

10 °C

4-Hydroxy-2-methoxybenzaldehyde was alkylated with 1-bromobutane by method H. The resulting aldehyde (6.4 g) in dioxane (100 ml) was mixed with sodium dihydrogen phosphate (14.4 g) and sulfuric acid (2.4 ml), and the solution was cooled to 10° C. A solution of sodium chlorite (3.61 g) in water (100 ml) was added in such a way that the temperature did not exceed 10° C. 15 minutes after the addition was complete, sodium sulfite (4.6 g) was added. After a further 15 minutes, the pH was adjusted to 2 with hydrochloric acid and the dioxane was removed in a rotary evaporator. The aqueous phase was extracted with ethyl acetate. The organic phase was dried over magnesium sulfate, filtered and concentrated. The residue was purified by preparative HPLC. This resulted in the product with the molecular weight of 224.26 (C12H16O4); MS (ESI): 225 (M+H+). 4-Butoxy-5-chloro-2-methoxybenzoic acid was obtained as by-product.

1. customdid not exceed 10° C
2. addition15 minutes after the addition
3. customthe dioxane was removed in a rotary evaporator
4. extractionThe aqueous phase was extracted with ethyl acetate
5. dry with materialThe organic phase was dried over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue was purified by preparative HPLC
9. customThis resulted in the product with the molecular weight of 224.26 (C12H16O4)