[C:1]1([NH:7][C:8]2([C:21]([O-:23])=[O:22])[CH2:13][CH2:12][N:11]([CH2:14][C:15]3[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=3)[CH2:10][CH2:9]2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[Na+].[CH3:25]N(C)P(=O)(N(C)C)N(C)C.IC>CC1C=CC=CC=1>[CH3:25][O:22][C:21]([C:8]1([NH:7][C:1]2[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=2)[CH2:9][CH2:10][N:11]([CH2:14][C:15]2[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=2)[CH2:12][CH2:13]1)=[O:23]A mixture of 66.4 parts of sodium 4-(phenylamino)-1-(phenylmethyl)-4-piperidinecarboxylate in 375 parts of hexamethylphosphoric triamide is heated to 70° C. After cooling to 10° C., 31.2 parts of iodomethane are added (slightly exothermic reaction). The whole is stirred for 21 hours at room temperature. The reaction mixture is diluted with 360 parts of methylbenzene. The whole is washed with water and the layers are separated. The aqueous phase is washed with methylbenzene. The combined organic layers are washed successively once with 300 parts of a 10% sodium hydroxide solution and twice with 300 parts of water, dried, filtered and evaporated, yielding methyl4-(phenylamino)-1-(phenylmethyl)-4-piperidinecarboxylate as a residue.
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