反应详情

To a solution of 4-acetylbenzoic acid (3.9 g) in anhydrous methylene chloride (120 ml) are added 4-dimethylaminopyridine (1.5 g), t-butyl alcohol (4.6 ml), N-methylmorpholine (3.4 ml) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (6.0 g) under ice cooling. The mixture is stirred under ice cooling for six hours and under water cooling overnight. The reaction mixture is concentrated under reduced pressure, water is added to the concentrate, and the whole is extracted with ether. The organic layer is washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue is purified by silica gel column chromatography to give 3.13 g (59%) of t-butyl 4-acetylbenzoate as crystals.

1. concentrationThe reaction mixture is concentrated under reduced pressure, water
2. additionis added to the concentrate
3. extractionthe whole is extracted with ether
4. washThe organic layer is washed with saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue is purified by silica gel column chromatography