反应详情

温度

0 °C

To a suspension of 23.6 g of ethyl alpha-aminoacetoacetate hydrochloride in 450 ml of chloroform cooled to 0° C. was added 19.52 ml of cyclohexylcarbonyl chloride. After 20 minutes at 0° C. 36 ml of triethylamine was added dropwise over a period of 30 minutes. The reaction mixture was allowed to warm to room temperature, was washed with water (2×300 ml) and brine (300 ml) and dried over magnesium sulfate. Removal of the solvent in vacuo gave 35.1 g of an oil which on chromatographing on 400 g of silica gel (hexane-ethyl acetate; 7.5:2.5; v:v) gave 13.9 g of product, m.p. 74°-75° C.

1. temperatureto warm to room temperature
2. washwas washed with water (2×300 ml) and brine (300 ml)
3. dry with materialdried over magnesium sulfate
4. customRemoval of the solvent in vacuo