反应详情

A solution of diethyl 2-acetamidomalonate (30.6 g), sodium ethoxide (7.6 g) and molecular sieves 3A (5.5 g) in ethanol (80 ml) was stirred at room temperature for 20 hours. A solution of 1-[4-(2-iodoethyl)phenyl]-5-phenylpentan-1-one (18.4 g) in tetrahydrofuran (60 ml) was added thereto over 10 minutes and the mixture was refluxed under heating for 15 hours. The reaction mixture was poured into water (200 ml) and extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate and the solvent was distilled away under reduced pressure to give a brown oily substance (40 g). The obtained brown oily substance was purified by silica gel column chromatography (eluent; hexane:ethyl acetate=2:1) to give diethyl 2-acetamido-2-{2-[4-(1-oxo-5-phenylpentyl)phenyl]ethyl}malonate (13.8 g) as a pale yellow oily substance.

1. temperaturethe mixture was refluxed
2. temperatureunder heating for 15 hours
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed with saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. distillationthe solvent was distilled away under reduced pressure
7. customto give a brown oily substance (40 g)
8. customThe obtained brown oily substance was purified by silica gel column chromatography (eluent; hexane:ethyl acetate=2:1)