反应详情

A 100-mL round bottom flask was charged with ethyl (Z)-3-amino-2-ethyl-but-2-enoate (880 mg, 5.6 mmol, 1 eq.), diisopropylethylamine (750 mg, 5.8 mmol, 1.04 eq.) and THF (10 ml). To the mixture was added ethyl 3-chloro-3-oxo-propanoate (840 mg, 5.6 mmol, 1 eq.) dropwise by a syringe at 0° C. After the addition was complete, the resulting mixture was stirred at room temperature overnight and then added to aqueous sodium bicarbonate solution. The mixture was extracted with ethyl acetate (3×15 ml). The combined organic layer was dried over anhydrous Na2SO4. Removal of solvent gave the crude product ethyl (Z)-3-[(3-ethoxy-3-oxo-propanoyl)amino]-2-ethyl-but-2-enoate as yellow oil (1.3 g, 86% yield).

1. additionAfter the addition
2. extractionThe mixture was extracted with ethyl acetate (3×15 ml)
3. dry with materialThe combined organic layer was dried over anhydrous Na2SO4
4. customRemoval of solvent