Sodium hydride → (1R,2S)-1-cyano-2-hexyl-1-(4-methoxyphenyl)cyclopropane

Participants

Reaction Steps

To a dispersion of 18 mg (0.75 mmol) of sodium hydride in 10 ml of DMF was added, with cooling with ice, a solution of 300 mg (0.70 mmol) of (2S,4R)-4-p-toluenesulfonyloxy-2-(4-methoxyphenyl)-decanenitrile in 10 ml of DMF. The resulting mixture was stirred at room temperature for 2 hours. The reaction mixture was neutralized by adjusting the pH thereof to 7 with diluted hydrochloric acid, and then subjected to extraction with 250 ml of ether. The resulting ether solution was washed with water, dried with anhydrous magnesium sulfate, and then concentrated. The isomers in the residue were separated by silica gel column chromatography (Kieselgel 60, hexane/ethyl acetate=9/1) and then further separated and purified by high-pressure liquid chromatography for separation (Tosoh Corporation, Japan; Silica-60, 21.5 mmID×300 mm, hexane/ethanol=100/1). Thus, 163 mg (yield 90%, optical purity 94% ee) of a nonpolar product, (1R,2S)-1-cyano-2-hexyl-1-(4-methoxyphenyl)cyclopropane and 7 mg (yield 4%) of a polar product, (1S,2S)-1-cyano-2-hexyl-1-(4-methoxyphenyl)cyclopropane, were obtained.

Provenance & Evidence