反应详情

温度

-78 °C

tert-Butyl-(3,5-dibromo-phenoxy)-dimethyl-silane (22 g; 60.08 mmol) was dissolved in THF (200 mL) in a dried reaction flask under an atmosphere of nitrogen. The mixture was cooled to −78° C. and n-BuLi (1.6 N in hexane; 41.25 mL; 66.09 mmol) was added while the temperature was kept between −60 and −78° C. The mixture was stirred for 15 min. and DMF (4.83 g; 66.08 mmol) was added. The reaction mixture was stirred for 1 h and methanol (5 mL) followed by saturated ammonium chloride was added. Ethyl acetate (200 mL) was added and the organic phase was separated from the aqueous phase. The organic phase was washed with water, dried, and evaporated to dryness. The crude product was purified by flash chromatography (heptane:dichloromethane (1:1). Yield 7 g. HPLC-MS: m/z: 317.0 (M+1); Rt: 2.7 min.

1. customwas kept between −60 and −78° C
2. stirringThe reaction mixture was stirred for 1 h
3. additionwas added
4. customthe organic phase was separated from the aqueous phase
5. washThe organic phase was washed with water
6. customdried
7. customevaporated to dryness
8. customThe crude product was purified by flash chromatography (heptane:dichloromethane (1:1)