Sodium hydride → 1-[2-(4-Cyanophenyl)ethyl]piperidin-4-spiro-2'-oxirane

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Reaction Steps

60% sodium hydride (1.89 g) was added to anhydrous dimethylsulfoxide (42 mL) and the mixture was stirred at room temperature for ten minutes under nitrogen atmosphere. After gradually adding trimethylsulfoxonium iodide (10.4 g) to the mixture at 10 to 19° C., the mixture was stirred at 8 to 10° C. for thirty minutes and at room temperature for sixty minutes. An anhydrous dimethylsulfoxide solution (42 mL) of the compound (9.00 g) obtained in Step 2 was added dropwise to the mixture. After stirring the resulting mixture at room temperature for one and half hours, the reaction mixture was poured into an ice water (250 mL) gradually with stirring. The mixture was extracted with ethyl acetate, and the organic layer was combined and washed with water and brine successively. The organic layer was dried over anhydrous sodium sulfate, the solvent was removed under reduced pressure. The residue was crystallized from hexane and collected by filtration to obtain the titled compound (8.61 g) as crystals.

Provenance & Evidence