反应详情

A mixture of 2.5 g of ethyl 2,4-dioxovalerate, 1.45 g of O-methylhydroxylamine hydrochloride and 10 ml of ethanol was heated to reflux for 2 hours. The reaction mixture was allowed to cool to room temperature, and partitioned between water and ethyl acetate. The organic layer was washed with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to obtain 1.34 g of ethyl 2-methoxyimino-4-oxopentanoate of the formula:

1. temperaturewas heated
2. temperatureto reflux for 2 hours
3. custompartitioned between water and ethyl acetate
4. washThe organic layer was washed with water
5. dry with materialan aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure