反应详情

To a solution of 25.1 g (0.085 mole) of 1-(phenylsulfonyl)-4-piperidinecarboxylic acid ethyl ester in 500 ml of dry tetrahydrofuran cooled to 0° C. and under an atmosphere of nitrogen, was added 95 ml of a 2 molar solution (0.19 mole) of cyclohexylmagnesium bromide in ether. The mixture was stirred for 2 hr at ambient temperature and then was quenched on an icy solution of ammonium chloride. The mixture was extracted with methylene chloride. The methylene chloride solution was dried over magnesium sulfate, and the solvent was removed in vacuo to give a semisolid material. This was recrystallized from ethanol to give 8.50 g (29.8% yield) of title compound as a white, crystalline solid, mp 141°-143° C.

1. customwas quenched on an icy solution of ammonium chloride
2. extractionThe mixture was extracted with methylene chloride
3. dry with materialThe methylene chloride solution was dried over magnesium sulfate
4. customthe solvent was removed in vacuo
5. customto give a semisolid material
6. customThis was recrystallized from ethanol