反应详情

A solution of 5-iodo-2,4-dimethylbenzoic acid (compound 1.3, 10.0 g, 32.6 mmol, 90%) and sulfuric acid (10 mL) in methanol (100 mL) was stirred overnight at 80° C. After cooling to room temperature, the mixture was concentrated under reduced pressure and the residue was diluted with of ethyl acetate (200 mL). The resulting mixture was washed with water (3×50 mL), sodium bicarbonate (aq. sat., 2×50 mL, caution: gas evolution), followed by brine (2×50 mL). The organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to yield 9.2 g (88%) of the title compound as a yellow oil.

1. concentrationthe mixture was concentrated under reduced pressure
2. additionthe residue was diluted with of ethyl acetate (200 mL)
3. washThe resulting mixture was washed with water (3×50 mL), sodium bicarbonate (aq. sat., 2×50 mL, caution: gas evolution)
4. dry with materialThe organic phase was dried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure