反应详情

Methyl hydrogen bicyclo[2.2.2]octane-1,4-dicarboxylate (25.0 g), diphenylphosphoryl azide (32.5 g), triethylamine (17.3 mL) and toluene (500 mL) were mixed together. The mixture was stirred for 2 hours at room temperature and was heated and refluxed for 2 hours. To the resulting mixture, benzylalcohol (122 mL) was added and the mixture was further heated and refluxed for 17 hours. Subsequently, the mixture was allowed to cool and was sequentially washed with a 10% aqueous citric acid, saturated aqueous solution of sodium bicarbonate, and saturated brine. The mixture was then dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluant:hexane:ethyl acetate=2:1) to give methyl 4-benzyloxycarbonylaminobicyclo[2.2.2]octane-1-carboxylate (32.2 g).

1. temperaturewas heated
2. temperaturerefluxed for 2 hours
3. temperaturethe mixture was further heated
4. temperaturerefluxed for 17 hours
5. temperatureto cool
6. washwas sequentially washed with a 10% aqueous citric acid, saturated aqueous solution of sodium bicarbonate, and saturated brine
7. dry with materialThe mixture was then dried over anhydrous sodium sulfate
8. concentrationconcentrated under reduced pressure
9. customThe residue was purified by silica gel column chromatography (eluant:hexane:ethyl acetate=2:1)