反应详情

75 ml of acetic anhydride were added dropwise at room temperature to a solution of 31,3 g of 4-ethoxy-2,3,5-trimethylpyridine 1-oxide in 100 ml of chloroform. After boiling under reflux for 16 hours the solution was evaporated, the residue was dissolved in 100 ml of toluene and again evaporated. The residue was taken up in 250 ml of ethyl acetate, whereupon it was extracted three times with 100 ml of saturated sodium bicarbonate solution. The organic phase was dried over sodium sulfate and evaporated in vacuo. The product was chromatographed on 170 g of silica gel with ether. There was obtained (4-ethoxy-3,5-dimethyl-2-pyridyl)methyl acetate in the form of an oil.

1. temperatureunder reflux for 16 hours the solution
2. customwas evaporated
3. dissolutionthe residue was dissolved in 100 ml of toluene
4. customagain evaporated
5. extractionwas extracted three times with 100 ml of saturated sodium bicarbonate solution
6. dry with materialThe organic phase was dried over sodium sulfate
7. customevaporated in vacuo
8. customThe product was chromatographed on 170 g of silica gel with ether