Ethyl chloroformate → trans-4-(4-Chlorophenoxy)-1-ethoxycarbonyl-3-phenylpiperidine

Participants

Reaction Steps

A mixture of 10.26 g of trans-4-(4-chlorophenoxy)-1-methyl-3-phenylpiperidine of Example 26, 7.05 g of anhydrous potassium carbonate, 75 ml of dry benzene and 5.53 g of ethyl chloroformate is refluxed for 18 hours under nitrogen. The mixture is then partitioned between distilled water and hexane. The organic phase is washed with water, the combined aqueous extracts are extracted with hexane, the combined organic extracts are washed with saturated aqueous NaCl solution, dried over anhydrous MgSO4, and concentrated in vacuo to afford an oil which almost completely crystallizes after standing for about 64 hours. The colorless solid is triturated with hexane, filtered and washed well with hexane to afford trans-4-(4-chlorophenoxy)-1-ethoxycarbonyl-3-phenylpiperidine, m.p. s 80°, 81.5°-84° C.

Provenance & Evidence