反应详情

To a solution of 5-bromo-2-methylphenol (Intermediate 1, 3.6 g, 19.3 mmol) in THF (150 mL) at −78° C. was added n-butyl lithium (30 mL, 1.6 M solution in hexanes, 48.1 mmol) and the reaction stirred at this temperature for 30 minutes. Trimethylsilyl chloride (6.1 mL, 48.1 mmol) was then added and the solution stirred at −78° C. for 1.5 hours. The reaction was allowed to warm to room temperature and water (75 mL) was added. The mixture was extracted with diethyl ether (2×75 mL) and the combined organic extracts were dried (magnesium sulphate) and concentrated under reduced pressure to afford 2-methyl-5-(trimethylsilyl)phenoxytrimethylsilane (5 g) as a yellow oil. 1H NMR δH 0.26 (9 H, s), 0.29 (9 H, s), 2.20 (3 H, s), 6.93 (1 H, d, J=1.1 Hz), 7.04 (1 H, dd, J=7.3, 1.1 Hz), 7.16 (1 H, d, J=7.4 Hz).

1. stirringthe solution stirred at −78° C. for 1.5 hours
2. extractionThe mixture was extracted with diethyl ether (2×75 mL)
3. dry with materialthe combined organic extracts were dried (magnesium sulphate)
4. concentrationconcentrated under reduced pressure