Potassium Carbonate → HCID 70513622, compound

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Reaction Steps

A mixture of 2.48 g of the free base cis-4-(3-chlorophenoxy)-1-methyl-3-phenylpiperidine, of Example 36, 1.14 g of anhydrous potassium carbonate and 30 ml of dry benzene is treated with 1.42 ml of 2,2,2-trichloroethyl chloroformate. After 30 minutes at room temperature the mixture is refluxed 18 hours. Another 0.36 ml of chloroformate is added, and the mixture is refluxed another 4 hours. The mixture is then cooled and partitioned between 100 ml of ether and 50 ml of water. The aqueous phase is extracted with 50 ml of ether, and the combined organic extracts are washed with 2 N HCl solution, saturated aqueous NaCl solution, and dried over Na2SO4. Concentration in vacuo affords a mixture of a solid and an oil which is triturated with 25 ml of ether and then diluted with hexane to a volume of about 125 ml. After refrigeration for 18 hours the mixture is filtered, the solid is washed with hexane, and the filtrate is washed successively with 10% aqueous NaOH solution, water, and saturated aqueous NaCl solution. After drying over Na2SO4 the solution is concentrated in vacuo to a gum. Chromatography of this material on silica gel affords a colorless gum of cis-4-(3-chlorophenoxy)-3-phenyl-1-(2,2,2-trichloroethoxycarbonyl) piperidine.

Provenance & Evidence