反应详情

Combine 2-(3,4-dichlorophenyl)-4-(t-butyldimethylsilyloxy)butyronitrile (13.35 g, 38.8 mmol) and anhydrous tetrahydrofuran (50 mL). Cool in a dry-ice/acetone bath. Add dropwise a solution of lithium bis(trimethylsilyl)amide (42.6 mL, 1 M in THF, 42.6 mmol). Add dropwise, ethyl 3-bromopropionate (7.71 g, 42.6 mmol). Warm the reaction mixture to ambient temperature. After 18 hours, add water. Separate the aqueous layer and extract three times with ethyl acetate. Combine the organic layers, dry over Na2SO4, filter, and concentrate in vacuo to obtain a residue. Chromatograph the residue on silica gel eluting with 90% ethyl acetate/hexane to give the title compound: Rf=0.35 (silica gel, 10% ethyl acetate/hexane).

1. temperatureCool in a dry-ice/acetone bath
2. additionAdd dropwise
3. customSeparate the aqueous layer
4. extractionextract three times with ethyl acetate
5. dry with materialdry over Na2SO4
6. filtrationfilter
7. concentrationconcentrate in vacuo
8. customto obtain a residue