反应详情

Cesium carbonate (8.34 g, 25.6 mmol) and (2-chloromethoxy-ethyl)-trimethyl-silane (1.71 g, 10.24 mmol) were added to a solution of 3-(4-pyridin-4-yl-1H-pyrazol-3-yl)-benzonitrile (2.10 g, 8.54 mmol) in dry DMF (70 ml) and the reaction mixture was stirred at room temperature under nitrogen atmosphere for 24 h. A further addition of (2-chloromethoxy-ethyl)-trimethyl-silane (0.57 g, 3.41 mmol) was required to affect reaction completion; the solvent was then removed under reduced pressure and the residue was taken up with DCM (50 ml). The organic layer was washed with a saturated NaHCO3 solution (1×50 ml), brine (1×50 ml), dried over Na2SO4. The filtrate was evaporated to dryness to give a brown oil, which was purified by flash chromatography, over silica gel, using DCM/MeOH/NH4OH (9.8:0.2:0.1) as eluent, to afford 3-[4-pyridin-4-yl-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazol-3-yl]-benzonitrile (2.57 g, 6.82 mmol, 80%).

1. customreaction completion
2. customthe solvent was then removed under reduced pressure
3. washThe organic layer was washed with a saturated NaHCO3 solution (1×50 ml), brine (1×50 ml)
4. dry with materialdried over Na2SO4
5. customThe filtrate was evaporated to dryness
6. customto give a brown oil, which
7. customwas purified by flash chromatography, over silica gel