反应详情

To a suspension of 1.97 g, (0.045 mol) sodiumhydride (60% in oil) in 60 ml tetrahydrofurane and 60 ml dimethylformamide were added 15.25 g (0.045 mol) (cyanomethyl)triphenyl-phosphonium phosphonium chloride. After stirring for 1 hour at room temperature a solution of 6.39 g (0.045 mol) 5-chloro-2-pyridinecarboxaldehyde in 25 ml tetrahydrofurane were added and stirring was continued for 2 days. Then 15 ml methanol were added, the solvents were evaporated and the residue was chromatographed on aluminiumoxide with ethylacetate/hexane 3/7 to yield 4.09 g (55%) (E)-3-(5-chloro-pyridin-2-yl)-acrylonitrile as white solid. MS m/e (%): 164 (M30 , 100), 137 (17), 113 (45).

1. additionwere added
2. customthe solvents were evaporated
3. customthe residue was chromatographed on aluminiumoxide with ethylacetate/hexane 3/7