反应详情

To a solution of 12.8 g (0.10 mole) of ethyl 2-oxo-3-butenoic acid (prepared as in Example 1) in 100 ml of ethanol and 50 ml of water is added 6.5 g (0.10 mole) of potassium cyanide. The mixture is stirred at 30°-50° for about one hour, during which time a solution of 6.0 g (0.10 mole) of acetic acid in 20 ml of ethanol is slowly dripped in. After addition is complete, the mixture is cooled to room temperature and the solvent is removed under vacuum. The residue is partitioned between water and CH2Cl2, the layers separated, and the water extracted further with CH2Cl2. The combined organic layers are dried (Na2SO4) and the solvent is removed to give the crude product. This is purified by flash chromatography on silica gel to give ethyl 4-cyano-2-oxo-butanoate as an oil.

1. additionAfter addition
2. customthe solvent is removed under vacuum
3. customThe residue is partitioned between water and CH2Cl2
4. customthe layers separated
5. extractionthe water extracted further with CH2Cl2
6. dry with materialThe combined organic layers are dried (Na2SO4)
7. customthe solvent is removed
8. customto give the crude product
9. customThis is purified by flash chromatography on silica gel