反应详情

12.9 g of ethyl cyanoacetate dissolved in 18 mL of N,N-dimethylformamide was added dropwise to a mixture of 4.5 g of sodium hydride and 40 mL of N,N-dimethylformamide under cooling with ice, and after 1.5 hours of stirring at room temperature, a solution of 20 g of ethyl p-fluorocinnamate in 18 mL of N,N-dimethylformamide was added. The mixture was heated at 50 to 60° C. for 21 hours. 30 mL of absolute ethanol was added under cooling with ice, and then an ethanol solution of acetic acid was added. After addition of water, the reaction mixture was extracted with ethyl acetate, and the extract was dried, concentrated and separated by silica gel column chromatography (hexane:ethyl acetate=5:1) to obtain 23.9 g of diethyl 2-cyano-3-(p-fluorophenyl)glutarate as a diastereomer mixture.

1. temperatureunder cooling with ice
2. temperatureThe mixture was heated at 50 to 60° C. for 21 hours
3. temperatureunder cooling with ice
4. extractionthe reaction mixture was extracted with ethyl acetate
5. customthe extract was dried
6. concentrationconcentrated
7. customseparated by silica gel column chromatography (hexane:ethyl acetate=5:1)