反应详情

温度

50 °C

8-Phenyl-1,4-dioxa-8-azaspiro[4.5]decane (18.1 g, 82.5 mmol) was dissolved in a mixture of acetic acid (150 mL), water (150 mL), and conc. hydrochloric acid (38 mL) and the resulting solution was heated to 50° C. for 18 hrs. The reaction mixture was cooled in an ice-water bath, and sodium hydroxide pellets were added in portions until the mixture was neutralized. This mixture was extracted with dichloromethane (3×300 mL) and the combined organic extracts were dried over MgSO4, filtered, and concentrated in vacuo to give a dark oil. Chromatography on silica gel, eluting with hexane--10% ethyl acetate gave the product as a pale yellow oil.

1. temperatureThe reaction mixture was cooled in an ice-water bath
2. extractionThis mixture was extracted with dichloromethane (3×300 mL)
3. dry with materialthe combined organic extracts were dried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customto give a dark oil
7. washChromatography on silica gel, eluting with hexane--10% ethyl acetate