反应详情

In dimethylformamide (10 ml) was suspended 60% sodium hydride (0.44 g, washed with hexane thrice), and to the suspension were added 5-(4-methylphenyl)cyclohexane-1,3-dione (2.0 g) and chloroacetone (0.92 g). The mixture was stirred at room temperature for 1 hour and then at 150° C. for 13 hours. Under reduced pressure, the solvent was evaporated, and the residue was dissolved in ethyl acetate, water and saturated brine, dried with magnesium sulfate and concentrated under reduced pressure. The residue was purified with silica gel column chromatography (EtOAc/hexane), and the resulting crystals were recrystallized from hexane to give colorless crystals of 3-methyl-6-(4-methylphenyl)-4,5,6,7-tetrahydrobenzofuran-4-one (0.51 g).

1. waitat 150° C. for 13 hours
2. customUnder reduced pressure, the solvent was evaporated
3. dissolutionthe residue was dissolved in ethyl acetate
4. dry with materialwater and saturated brine, dried with magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified with silica gel column chromatography (EtOAc/hexane)
7. customthe resulting crystals were recrystallized from hexane