反应详情

Dissolve 1-[4-(diethoxymethyl)-phenyl]-3,3-dimethylbutan-1-one (3.49 g, 12.55 mmol) in acetone (50 mL). Add p-toluenesulfonic acid monohydrate (238 mg, 1.256 mmol). Heat the mixture under reflux for 3 h. Concentrate in vacuo and partition the residue between water and EtOAc. Extract the aqueous phase three times with EtOAc. Dry the combined organic extracts over Na2SO4, filter and concentrate in vacuo. Purify the crude mixture by chromatography on silica gel eluting with hexane/EtOAc (9:1) to give the desired intermediate as a colorless oil (1.67 g, 65%).

1. temperatureHeat the mixture
2. temperatureunder reflux for 3 h
3. concentrationConcentrate in vacuo
4. custompartition the residue between water and EtOAc
5. extractionExtract the aqueous phase three times with EtOAc
6. dry with materialDry the combined organic extracts over Na2SO4
7. filtrationfilter
8. concentrationconcentrate in vacuo
9. customPurify the crude mixture by chromatography on silica gel eluting with hexane/EtOAc (9:1)