反应详情

Triethylamine (1.16 ml, 8.32 mmol) was added to a suspension of methyl 4-amino-2,5-dimethylbenzoate monohydrochloride (0.600 g, 2.78 mmol) in dichloromethane (8 ml), and the resulting mixture was cooled with ice water, followed by adding dropwise thereto a solution of acetyl chloride (0.263 g, 3.35 mmol) in dichloromethane (2 ml). The resulting mixture was heated to room temperature and stirred for 3 hours, and then acetyl chloride (0.262 g, 3.34 mmol) was further added thereto and stirred for 1.5 hours. The resulting mixture was added to a saturated aqueous sodium hydrogencarbonate solution and extracted three times with ethyl acetate, and the organic layer was washed with a saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off to obtain methyl 4-(acetylamino)-2,5-dimethylbenzoate (0.685 g, 99%).

1. additionby adding dropwise
2. stirringstirred for 1.5 hours
3. extractionextracted three times with ethyl acetate
4. washthe organic layer was washed with a saturated aqueous sodium chloride solution
5. dry with materialdried over anhydrous magnesium sulfate
6. distillationThe solvent was distilled off