反应详情

温度

0 °C

Ethyl 3-amino-2-phenylpropanoate hydrochloride (4.38 g, 19.13 mmol) was suspended in methylene chloride (80 mL) and triethylamine (5.86 mL, 2.2 eq.). The mixture was cooled to 0° C. and treated dropwise with ethyl 3-chloro-3-oxopropanoate (2.69 mL, 1.1 eq.). The reaction was kept at room temperature for one hour, diluted with methylene chloride, washed with 1 N HCl and then with 5% NaHCO3, dried over Na2SO4 and evaporated to dryness. The crude material was chromatographed on silica gel, eluting with hexane/ethyl acetate 1/1, to give 3-(2-ethoxycarbonyl-acetylamino)-2-phenyl-propionic acid ethyl ester (4.24 g, Y=72%) as an oil.

1. washwashed with 1 N HCl
2. dry with materialwith 5% NaHCO3, dried over Na2SO4
3. customevaporated to dryness
4. customThe crude material was chromatographed on silica gel
5. washeluting with hexane/ethyl acetate 1/1