反应详情

Heat a suspension of 4-bromo-N-(2-pyridin-2-yl-ethyl)-benzenesulfonamide (1.67 g, 4.89 mmol), (E)-3-cyclopentyl-2-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-prop-2-en-1-ol (1.60 g, 6.36 mmol), caesium fluoride (2.23 g, 14.7 mmol) and tetrakis(triphenylphosphino)palladium(0) (565 mg, 489 μmol) in 50 mL dioxane to reflux for 2 d and cool to r.t. thereafter. After addition of 50 mL THF filtrate the resulting suspension, wash with dichloromethane and concentrate under reduced pressure. Further purify the resulting brown oil by column chromatography, eluting with a gradient from 100:0 to 0:100 hexanes:ethyl acetate to afford (E)-4-(2-cyclopentyl-1-hydroxymethyl-vinyl)-N-(2-pyridin-2-yl-ethyl)-benzenesulfonamide (929 mg) as a pale yellow oil. MS (m/e): 387 (M+H).

1. temperatureHeat
2. temperatureto reflux for 2 d
3. washwash with dichloromethane
4. concentrationconcentrate under reduced pressure
5. customFurther purify the resulting brown oil by column chromatography
6. washeluting with a gradient from 100:0 to 0:100 hexanes