反应详情

To a mixture of 2,2,5-trimethyl-1,3-dioxane5-carboxylic acid (1.0 g, 5.74 mmol) and DMF (10 mL) were added N,O-dimethylhydroxylamine hydrochloride (0.84 g, 8.6 mmol), 1-hydroxybenzotriazole hydrate (1.32 g, 8.6 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloric acid (1.651 g, 8.61 mmol) and triethylamine (2.39 mL, 17.2 mmol) under nitrogen atmosphere, and the resulting mixture was stirred at room temperature for 3 hours. After the reaction was completed, water was added to the reaction mixture and the resulting mixture was extracted with ethyl acetate. The extract was washed with brine, dried over anhydrous sodium sulphate, and concentrated in vacuo to give N-methoxy-N,2,2,5-tetramethyl-1,3-dioxane5-carboxylic acid amid (1.08 g, yield: 86%) as colorless oil.

1. extractionthe resulting mixture was extracted with ethyl acetate
2. washThe extract was washed with brine
3. dry with materialdried over anhydrous sodium sulphate
4. concentrationconcentrated in vacuo