反应详情

温度

135 °C

An amount 60 ml of acetic anhydride was stirred at about 120° C., and a solution of 11.1 g of 6-butoxy-α-picoline N-oxide in 25 ml of glacial acetic acid was dropwise added thereto over about one hour. After the dropwise addition, the mixture was stirred at 135° C. for 4.5 hours, acetic acid and acetic anhydride were removed by concentration under a reduced pressure, the reaction mixture was dissolved in ether, and the remaining acetic acid was neutralized with an aqueous sodium hydrogen carbonate solution. The mixture was extracted with ether, concentrated under a reduced pressure, and separated by silica gel column chromatography (ethyl acetate:hexane=8:92) to obtain 4.89 g of the desired product (yield 35.9%).

1. additionAfter the dropwise addition
2. customacetic acid and acetic anhydride were removed by concentration under a reduced pressure
3. dissolutionthe reaction mixture was dissolved in ether
4. extractionThe mixture was extracted with ether
5. concentrationconcentrated under a reduced pressure
6. customseparated by silica gel column chromatography (ethyl acetate:hexane=8:92)