反应详情

At room temperature, to tetrahydrofuran 50 ml was added 55% sodium hydride 3.07 g and ethyl acetate 5.90 g and the resulting mixture was stirred for a half hour. Then, thereto was added 1 (4 methoxy-3-methylphenyl)-ethanone (described in Reference Preparation example 48) 5.50 g, dibenzo-18-crown-6 0.024 g and ethanol 1 ml and the resulting mixture was stirred with heating under reflux for six hours. To the reaction mixture was added water and the resulting mixture was acidified with aqueous 10% hydrochloric acid solution and was extracted with ethyl acetate. The organic layer was washed with water and was dried over anhydrous magnesium sulfate, and was then concentrated under reduced pressure. The resulting residue was subjected to a silica gel column chromatography to give 1-(4-methoxy-3-methyl-phenyl)-butane-1,3-dione 6.50 g.

1. stirringthe resulting mixture was stirred
2. temperaturewith heating
3. temperatureunder reflux for six hours
4. extractionwas extracted with ethyl acetate
5. washThe organic layer was washed with water
6. dry with materialwas dried over anhydrous magnesium sulfate
7. concentrationwas then concentrated under reduced pressure