反应详情

Methyl vinyl ketone (1.64 ml), ethanol (5 ml) and water (5 ml) were added to benzyl 4-formylpiperidine-1-carboxylate (5 g). The mixture was then added to a boiling solution of potassium hydroxide (0.22 g) in ethanol (10 ml), and the resulting reaction mixture was refluxed for 1 h (TLC monitoring). When the reaction was complete, the mixture was added to water (25 ml) and extracted with ethyl acetate (2×50 ml). The combined organic phases were dried (Na2SO4) and concentrated under vacuum. The crude product so obtained was purified by column chromatography (silical gel, 25% ethyl acetate/hexane). Yield: 2.8 g (46%)

1. customthe resulting reaction mixture
2. temperaturewas refluxed for 1 h (TLC monitoring)
3. extractionextracted with ethyl acetate (2×50 ml)
4. dry with materialThe combined organic phases were dried (Na2SO4)
5. concentrationconcentrated under vacuum