反应详情

To a solution of (4-bromo-3-tert-butyl-phenoxy)-triisopropyl-silane (Intermediate 105, 1.00 g, 2.60 mmols) in 15 mL Et2O cooled to −78° C. was added 3.6 mL of tert-butyllithium, 1.7 M in pentane (395.0 mg, 6.2 mmols). After stirring for 30 minutes ethyl chloroformate (607.6 mg, 5.6 mmols) was added. The resulting solution was warmed to room temperature and quenched by the addition of saturated aqueous NH4Cl. The mixture was extracted with EtOAc and the combined organic layers dried (MgSO4) concentrated under reduced pressure The residue was chromatographed (2-5% EtOAc-hexanes) to give 1.23 g (88%) of the title compound as a colorless oil.

1. additionwas added
2. customquenched by the addition of saturated aqueous NH4Cl
3. extractionThe mixture was extracted with EtOAc
4. dry with materialthe combined organic layers dried (MgSO4)
5. concentrationconcentrated under reduced pressure The residue
6. customwas chromatographed (2-5% EtOAc-hexanes)