[CH3:1][O:2][N:3]1[CH2:8][CH2:7][C:6]([S:12][CH2:13][C:14]2[CH:19]=[CH:18][C:17]([O:20][CH3:21])=[CH:16][CH:15]=2)([C:9](O)=[O:10])[CH2:5][CH2:4]1.S(Cl)([Cl:24])=O>C1(C)C=CC=CC=1.CN(C)C=O>[CH3:1][O:2][N:3]1[CH2:8][CH2:7][C:6]([S:12][CH2:13][C:14]2[CH:19]=[CH:18][C:17]([O:20][CH3:21])=[CH:16][CH:15]=2)([C:9]([Cl:24])=[O:10])[CH2:5][CH2:4]1700 mg 1-Methoxy-4-(4-methoxy-benzylsulfanyl)-piperidine-4-carboxylic acid (from Step 5) was dissolved in 10 ml toluene, 1 drop N,N-dimethylformamide was added, followed by 400 mg thionyl chloride. The mixture was heated to 100° C. for 1 hour, at which time the evolution of gas has ceased. The solvent was evaporated, to yield crude 1-methoxy-4-(4-methoxy-benzylsulfanyl)-piperidine-4-carbonyl chloride.
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