反应详情

温度

-85 °C

A 1.6 M solution of n-BuLi in hexane (44.4 ml, 69.9 mmol) was added within 10 min to a stirred cooled (−85° C.) solution of 1-bromo-2-ethyl-4-(phenylmethoxy)-benzene (18.5 g, 63.5 mmol) in dry THF (22 ml). The mixture was stirred for 1 h at −85° C. under an argon atmosphere. N,N-Dimethylformamide (25.5 ml, 330.4 mmol) was added and the temperature was allowed to rise slowly to room temperature. An aqueous saturated NH4Cl solution (70 ml) was added under ice cooling. The mixture was extracted two times with dichloromethane, the combined extracts were washed with brine and dried over sodium sulfate. Removal of the solvent under reduced pressure gave a yellow oil which was purified by column chromatography (silica gel, cyclohexane/AcOEt) to yield 11.9 g (49.5 mmol, 78%) of the title compound as yellow oil.

1. customto rise slowly to room temperature
2. extractionThe mixture was extracted two times with dichloromethane
3. washthe combined extracts were washed with brine
4. dry with materialdried over sodium sulfate
5. customRemoval of the solvent under reduced pressure
6. customgave a yellow oil which
7. customwas purified by column chromatography (silica gel, cyclohexane/AcOEt)