反应详情

Under nitrogen atmosphere, 2-methoxy-1-bromo-3-tert-butyl-5-methylbenzene (20.00 g, 77.77 mmol) was dissolved in 200 mL of diethyl ether. A 1.57 M hexane solution of n-butyllithium (59.44 mL, 93.32 mmol) was dropwise added at −50° C. or lower, and a temperature was raised to room temperature, followed by stirring for 1 hour. All the amount of diethyldichlorosilane (24.44 g, 155.54 mmol) was added to the mixture at once at −50° C. or lower, and a temperature was gradually raised to room temperature. After being refluxed for 1 hour, the solution was concentrated under reduced pressure. Hexane was added, the insolubles were filtered off with a Celite filter, and the filtrate was concentrated under reduced pressure. Concentration was further continued at 70° C. under reduced pressure for 3 hours to obtain (2-methoxy-3-tert-butyl-5-methylphenyl)chlorodimethylsilane. Resultant (2-methoxy-3-tert-butyl-5-methylphenyl)chlorodimethylsilane was used in a subsequent reaction without further purification.

1. temperaturelower, and a temperature was gradually raised to room temperature
2. temperatureAfter being refluxed for 1 hour
3. concentrationthe solution was concentrated under reduced pressure
4. additionHexane was added
5. filtrationthe insolubles were filtered off with a Celite
6. filtrationfilter
7. concentrationthe filtrate was concentrated under reduced pressure
8. concentrationConcentration
9. waitwas further continued at 70° C. under reduced pressure for 3 hours