反应详情

Potassium cyanide, 1.3 g (20 mmol) is added to a room temperature solution of (R*,R*)-α-2-propenyloxiraneethanol, 2.56 g (20 mmol), in 25 mL of 4:1 isopropanol:water. The solution is stirred for 20 hours at ambient temperature, concentrated, and partitioned between ethyl acetate and brine. The aqueous layer is extracted 2× with ethyl acetate and the combined ethyl acetate extracts are washed with brine and dried (magnesium sulfate). The crude product is dissolved in 20 mL of dimethoxymethane, camphorsulfonic acid is added, and the solution is stirred for 18 hours at room temperature. Concentration and flash chromatography after concentration in vacuo provides 1.20 g of (±)-cis-6-(2-propenyl)-1,3-dioxane-4-acetonitrile.

1. concentrationconcentrated
2. custompartitioned between ethyl acetate and brine
3. extractionThe aqueous layer is extracted 2× with ethyl acetate
4. washthe combined ethyl acetate extracts are washed with brine
5. dry with materialdried (magnesium sulfate)
6. dissolutionThe crude product is dissolved in 20 mL of dimethoxymethane
7. additioncamphorsulfonic acid is added
8. stirringthe solution is stirred for 18 hours at room temperature
9. concentrationConcentration and flash chromatography
10. concentrationafter concentration in vacuo