反应详情

0.50 g (12.6 mmol) of 60% strength sodium hydride in paraffin oil is introduced under argon into 20 ml of THF at room temperature. A solution of 2.0 g (8.40 mmol) of 5-bromo-3-isopropyl-1H-indole (Example X) in 20 ml of THF is added dropwise and the mixture is stirred until evolution of gas can no longer be detected. 2.03 g (13.44 mmol) of tert-butyl(chloro)dimethylsilane are subsequently added dropwise. After a short reaction time a precipitate deposits. The batch is stirred for 3 h at room temperature. It is treated with 200 ml of water. The aqueous phase is extracted twice with ethyl acetate, and the combined org. phases are dried and concentrated in a rotary evaporator. The residue is chromatographed on silica gel (eluent: cyclohexane). 2.63 g (89%) of 5-bromo-1-[tert-butyl(dimethyl)silyl]-3-isopropyl-1H-indole are obtained.

1. stirringThe batch is stirred for 3 h at room temperature
2. extractionThe aqueous phase is extracted twice with ethyl acetate
3. customphases are dried
4. concentrationconcentrated in a rotary evaporator
5. customThe residue is chromatographed on silica gel (eluent: cyclohexane)