反应详情

To a cold (0° C.) solution of sodium hydride (60% dispersion in mineral oil, 3.48 g) in dioxane (70 ml) was added dropwise absolute ethanol (70 ml). The mixture was allowed to warm to room temperature and a solution of diethyl acetamido malonate (20.5 g) in dioxane (70 ml) was added dropwise. Sodium iodide (9.07 g) was added and a solution of 1-acetylamino-4-chloro-2-butyne (11 g) in dioxane (140 ml) was added dropwise at room temperature. After addition of another 100 ml of ethanol the mixture was refluxed for 2.5 h. The reaction mixture was cooled and the precipitate formed was filtered off. Purification using chromatography on silica (eluent: ethyl acetate/methanol 9/1 v/v) yielded acetamido(4-acetamido-2-butynyl)-malonic acid diethyl ester. (15.9 g).

1. temperaturewas refluxed for 2.5 h
2. temperatureThe reaction mixture was cooled
3. customthe precipitate formed
4. filtrationwas filtered off
5. customPurification