反应详情

A solution of 4,4-dimethyl-7-oxa-bicyclo[4.1.0]heptan-2-one (44.0 g, 0.31 mol) in methanol (150 mL) was added to a solution of 85% potassium hydroxide (20.7 g, 0.31 mol) in methanol (450 mL) at room temperature. The mixture was kept at this temperature for 20 hours and was then heated to reflux for 30 minutes. After cooling, the solution was diluted with water (1.2 L) and extracted with ethyl ether (350 mL×5). The organic extracts were collected, washed with brine, dried on Na2SO4 and evaporated under vacuum to remove most of the solvent. The crude material was purified by distillation to obtain pure the title compound (32.8 g, 68% yield) as an oil.

1. temperaturewas then heated
2. temperatureto reflux for 30 minutes
3. temperatureAfter cooling
4. extractionextracted with ethyl ether (350 mL×5)
5. customThe organic extracts were collected
6. washwashed with brine
7. customdried on Na2SO4
8. customevaporated under vacuum
9. customto remove most of the solvent
10. distillationThe crude material was purified by distillation