反应详情

In a 200 ml three-necked flask equipped with a magnetic stirrer chip and three-way cock thoroughly purged with nitrogen, 2.73 g of 3-tert-butyl-1-methyl-cyclopentadiene (20.1 mmol) was dissolved in 30 ml of dehydrated tetrahydrofuran in a nitrogen atmosphere. To the solution, 13.5 ml of n-butyl lithium/hexane solution (1.58M: 21.3 mmol) was gradually added dropwise in an ice bath and stirred at room temperature for 3 days. To the reaction solution, 10.5 ml of hexamethyl phosphoramide (60.4 mmol) was added and stirred at room temperature for 1 hr. To the solution, a solution prepared by dissolving 3.87 g of benzophenone (21.2 mmol) in 40 ml of dehydrated tetrahydrofuran was gradually added dropwise in an ice bath and stirred at room temperature over night. To the resulting reaction mixture, 50 ml of a hydrochloric acid aqueous solution (1N) was gradually added dropwise in an ice bath and stirred at room temperature for some time. Diethyl ether was added to the mixed solution to separate an organic phase. The organic phase was washed with a saturated sodium bicarbonate aqueous solution, water and saturated brine. The organic phase was dried with anhydrous magnesium sulfate, thereafter the drying agent was filtered off and the solvent was distilled off from the filtrate under reduced pressure to give a dark-red liquid. The liquid was purified with a column chromatography using 300 g of silica gel (developing solvent: n-hexane) and the developing solvent was distilled off under reduced pressure, and thereby the aimed compound was obtained in an amount of 3.28 g (10.9 mmol) as a reddish-orange solid (yield: 54%).

1. customIn a 200 ml three-necked flask equipped with a magnetic stirrer chip and three-way cock
2. stirringstirred at room temperature for 1 hr
3. customTo the solution, a solution prepared
4. additionwas gradually added dropwise in an ice bath
5. stirringstirred at room temperature over night
6. additionwas gradually added dropwise in an ice bath
7. stirringstirred at room temperature for some time
8. customto separate an organic phase
9. washThe organic phase was washed with a saturated sodium bicarbonate aqueous solution, water and saturated brine
10. dry with materialThe organic phase was dried with anhydrous magnesium sulfate
11. filtrationthe drying agent was filtered off
12. distillationthe solvent was distilled off from the filtrate under reduced pressure
13. customto give a dark-red liquid
14. customThe liquid was purified with a column chromatography
15. distillationthe developing solvent was distilled off under reduced pressure