反应详情

温度

60 °C

To a mixture of 17.2 g of 3-methyl-2-butanone, 27.1 g of diethyl oxalate and 130 ml of ethanol was added 95 ml of sodium ethoxide (20% ethanol solution), and the resulting mixture was stirred at 60° C. for 5 hours. After allowed to cool to room temperature, a deposited precipitate was collected by filtration and washed with ethanol. The filter cake was partitioned between 2N hydrochloric acid and methyl t-butyl ether. The organic layer was washed with an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure to obtain 28.8 g of ethyl 4-hydroxy-5-methyl-2-oxo-3-hexenoate of the formula:

1. temperatureto cool to room temperature
2. filtrationa deposited precipitate was collected by filtration
3. washwashed with ethanol
4. customThe filter cake was partitioned between 2N hydrochloric acid and methyl t-butyl ether
5. washThe organic layer was washed with an aqueous saturated sodium chloride solution
6. dry with materialdried over anhydrous magnesium sulfate
7. concentrationconcentrated under reduced pressure