反应详情

温度

-78 °C

Diisopropylamine (4.55 g, 6.36 mL, 45.0 mmol) was dissolved in THF (100 mL) and cooled to −78° C. To this solution was added 2.5 M n-butyl lithium in hexane (18 mL, 45.0 mmol). The solution was stirred for 15 min, warmed up to 0° C. and stirred for an additional 20 min, then re-cooled to −78° C. Dimethyl 1,4-cyclohexanedicarboxylate (7.5 g, 37.50 mmol) in THF (10 mL) was then added and the reaction mixture was allowed to stir at −78° C. for 1.0 h followed by the addition of a mixture of hexamethyl-phosphoramide (HMPA) (5.0 g, 4.85 mL, d=1.03) and allyl iodide (8.19 g, 4.48 mL, 48.8 mmol). This mixture was stirred at −78° C. for 20 min. Then, the dry ice bath was removed and the stirring was continued to allow the reaction mixture to warm to room temperature over 1 h. The reaction mixture was poured into ice-water (100 mL) and ether (50 mL). The two layers were separated and the aqueous layer was extracted with ether (3×50 mL). The combined organic layers were washed with brine, dried over Na2SO4, and concentrated under vacuum to afford 9.23 g (97%) of the title compound.

1. temperaturewarmed up to 0° C.
2. stirringstirred for an additional 20 min
3. temperaturere-cooled to −78° C
4. stirringto stir at −78° C. for 1.0 h
5. stirringThis mixture was stirred at −78° C. for 20 min
6. customThen, the dry ice bath was removed
7. temperatureto warm to room temperature over 1 h
8. additionThe reaction mixture was poured into ice-water (100 mL) and ether (50 mL)
9. customThe two layers were separated
10. extractionthe aqueous layer was extracted with ether (3×50 mL)
11. washThe combined organic layers were washed with brine
12. dry with materialdried over Na2SO4
13. concentrationconcentrated under vacuum