反应详情

To 12 g of ethyl cyanoacetate dissolved in 20 mL of ethanol, 8 g of sodium ethoxide and 40 mL of ethanol were added under cooling with ice, and then 20 g of ethyl p-fluorocinnamate and 40 mL of ethanol were added. The reaction mixture was heated under reflux for 20 hours and then filtered. The filtrate was poured into a mixture of 200 g of ice and 10 mL of concentrated hydrochloric acid and extracted with chloroform. The extract was concentrated and separated by silica gel column chromatography (hexane:ethyl acetate=9:1) to obtain 15 g of diethyl 2-cyano-3-(p-fluorophenyl)glutarate as a diastereomer mixture.

1. temperatureunder cooling with ice
2. temperatureThe reaction mixture was heated
3. temperatureunder reflux for 20 hours
4. filtrationfiltered
5. additionThe filtrate was poured into a mixture of 200 g of ice and 10 mL of concentrated hydrochloric acid
6. extractionextracted with chloroform
7. concentrationThe extract was concentrated
8. customseparated by silica gel column chromatography (hexane:ethyl acetate=9:1)