Cl.Cl.[O:3]1[C:8]2[CH:9]=[CH:10][CH:11]=[CH:12][C:7]=2[O:6][CH2:5][CH:4]1[CH:13]([OH:34])[CH2:14][NH:15][CH:16]1[CH2:21][CH2:20][N:19]([CH2:22][C:23]([NH:25][C:26]2[C:31]([CH3:32])=[CH:30][CH:29]=[CH:28][C:27]=2[CH3:33])=[O:24])[CH2:18][CH2:17]1.[OH-].[NH4+]>O>[O:3]1[C:8]2[CH:9]=[CH:10][CH:11]=[CH:12][C:7]=2[O:6][CH2:5][CH:4]1[CH:13]([OH:34])[CH2:14][NH:15][CH:16]1[CH2:21][CH2:20][N:19]([CH2:22][C:23]([NH:25][C:26]2[C:27]([CH3:33])=[CH:28][CH:29]=[CH:30][C:31]=2[CH3:32])=[O:24])[CH2:18][CH2:17]1A solution of 3.5 g of 4-{[2-(1,4-benzodioxan-2-yl)-2-hydroxyethyl]amino}-1-[(2,6-dimethylphenyl)aminocarbonylmethyl]piperidine dihydrochloride salt in water (50 ml) is adjusted to pH 12 with ammonium hydroxide solution and extracted with methylene chloride. The methylene chloride is evaporated to afford 3 g of 4-{[2-(1,4-benzodioxan-2-yl)-2-hydroxyethyl]amino}-[(2,6-dimethylphenyl)aminocarbonylmethyl]piperidine as the free base.
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