Potassium Iodide → 4-(4-Methylsulfonylaminobenzoyl)-1-[2-(3-pyridyl)ethyl]piperidine dihydrochloride

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35 g (0.101 mol) of 4-(4-methylsulfonylaminobenzoyl)piperidine hydrochloride and 55 g of potassium carbonate were suspended in 700 ml of dimethylformamide and the suspension was stirred at 40° C. for 20 min. 19.6 g (0.101 mol) of 3-(2-chloroethyl)pyridine hydrochloride and 6.0 g (0.036 mol) of potassium iodide were added to the suspension and the mixture was stirred at 90° C. for 3.5 h. The liquid reaction mixture was filtered and the filtrate was concentrated, while the residue was purified according to silica gel chromatography (chloroform:methanol=93.7). The purified product was converted into its hydrochloride with ethanolic hydrogen chloride and recrystallized from methanol/ispropanol to obtain 13.4 g of the intended compound.

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