[C:1]1([CH2:7][N:8]2[CH2:13][CH2:12][CH:11]([SH:14])[CH2:10][CH2:9]2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.Cl[CH2:16][C:17](=[O:19])[CH3:18].C(=O)([O-])[O-].[Na+].[Na+]>[I-].C([N+](CCCC)(CCCC)CCCC)CCC.C1(C)C=CC=CC=1>[O:19]=[C:17]([CH3:18])[CH2:16][S:14][CH:11]1[CH2:12][CH2:13][N:8]([CH2:7][C:1]2[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=2)[CH2:9][CH2:10]1A suspension of 1-(phenylmethyl)piperidine-4-thiol (70 g, prepared in Example 1), chloroacetone (26.9 ml), sodium carbonate (71.6 g) and tetrabutylammonium iodide (31.2 g) in toluene (350 ml) is stirred at room temperature for 4 hours. The insoluble material is filtered off and washed with toluene. After concentration, the filtrate is taken up in dichloromethane and washed with dilute sodium hydroxide and then with a saturated aqueous solution of sodium chloride. After drying over sodium sulfate, the solution is concentrated to give 4-[(2-oxopropyl)thio]-1-(phenylmethyl)piperidine (82.2 g) in the form of an oil, which is sufficiently pure to be used in the next step.
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