反应详情

温度

-78 °C

5 ml of a 1.2M solution of butyllithium in n-hexane were added to a solution of 0.6 g of diisopropylamine in 10 ml of tetrahydrofuran while stirring at -78° C. under a nitrogen atmosphere. The solution was stirred for a further 15 minutes and then 1.07 g of 5-benzyloxy-2-methylpyridine N-oxide in 10 ml of tetrahydrofuran were added. The mixture was allowed to warm to 20° C. stirred for 30 minutes and then cooled to -78° C. 1.16 g of ethyl (4-cyanophenoxy)-2-methylpropionate were added and the mixture was then allowed to warm to 20° C. and was stirred for 16 hours. The mixture was diluted with 50 ml of ethyl acetate and washed in succession with water and sodium chloride solution The organic phase was evaporated and the residue was chromatographed on silica gel using dichloromethane/methanol (94:4) for the elution to give 0.46 g of 5-benzyloxy-2-[3-(4-cyanophenoxy)-3-methyl-2oxobutyl]pyridine N-oxide in the form of a pale yellow

1. stirringThe solution was stirred for a further 15 minutes
2. temperatureto warm to 20° C.
3. stirringstirred for 30 minutes
4. temperaturecooled to -78° C
5. temperatureto warm to 20° C.
6. stirringwas stirred for 16 hours
7. washwashed in succession with water and sodium chloride solution The organic phase
8. customwas evaporated
9. customthe residue was chromatographed on silica gel
10. washfor the elution