反应详情

温度

80 °C

A mixture of 1,4-dioxa-7-azaspiro[4.4]nonane (23.54 g, step iv, no more than 182 mmol), cyclohexene oxide (22.6 mL, 98%, 219 mmol) and water (7.8 mL) was heated at 80° C. for 2 hours. The reaction mixture was then partitioned between 40% sodium hydroxide aqueous solution (60 mL) and diethyl ether (120 mL). The basic aqueous layer was extracted twice more with diethyl ether (2×120 mL). The combined organic extracts were dried over sodium sulfate and concentrated in vacuo. The residue was then pumped under high vacuum at 50° C. for 1 hour under stirring (to remove the excess of cyclohexene oxide) to yield 32.79 g of the crude title compound (yield 79.3%).

1. customThe reaction mixture was then partitioned between 40% sodium hydroxide aqueous solution (60 mL) and diethyl ether (120 mL)
2. extractionThe basic aqueous layer was extracted twice more with diethyl ether (2×120 mL)
3. dry with materialThe combined organic extracts were dried over sodium sulfate
4. concentrationconcentrated in vacuo
5. customto remove the excess of cyclohexene oxide)