反应详情

A solution of triethylamine (15 g) in chloroform (15 ml) was added dropwise to a stirred mixture of 2-aminopropiophenone hydrochloride (12 g) and chloroform (65 ml) at ice bath temperature in 10 minutes. To the stirred mixture was added dropwise a solution of ethyl chloroformate (8 g) in chloroform (20 ml) under the same conditions and then stirring was continued for 4 hours at ice bath temperature. The solution was evaporated under reduced pressure and the residue was dissolved in a mixture of ethyl acetate and water. The organic layer was separated, washed successively with a saturated aqueous solution of sodium bicarbonate, water, 5% hydrochloric acid, and water, dried over magnesium sulfate, and evaporated under reduced pressure to give an oil containing the object compound. The above obtained product was purified by column chromatography on silica gel (200 g) using a mixture of diisopropyl ether and chloroform (1:4) as an eluent to give an oil of 2-ethoxycarbonylaminopropiophenone (10.48 g).

1. customThe solution was evaporated under reduced pressure
2. dissolutionthe residue was dissolved in a mixture of ethyl acetate and water
3. customThe organic layer was separated
4. washwashed successively with a saturated aqueous solution of sodium bicarbonate, water, 5% hydrochloric acid, and water
5. dry with materialdried over magnesium sulfate
6. customevaporated under reduced pressure
7. customto give an oil
8. additioncontaining the object compound
9. customThe above obtained product
10. customwas purified by column chromatography on silica gel (200 g)
11. additiona mixture of diisopropyl ether and chloroform (1:4) as an eluent