FC(F)(F)C(O)=O.[CH3:8][O:9][C:10]1[C:15]([O:16][CH3:17])=[CH:14][CH:13]=[CH:12][C:11]=1[C:18]1([CH:24]=[O:25])[CH2:23][CH2:22][NH:21][CH2:20][CH2:19]1.[OH-].[Na+]>O>[CH3:8][O:9][C:10]1[C:15]([O:16][CH3:17])=[CH:14][CH:13]=[CH:12][C:11]=1[C:18]1([CH:24]=[O:25])[CH2:23][CH2:22][NH:21][CH2:20][CH2:19]1The resulting 4-(2,3-dimethoxyphenyl)-4-piperidinylmethanone trifluoroacetate was dissolved in water, treated with NaOH (10% aqueous) until basic, and extracted three times with dichloromethane. The combined organic layers were washed with brine, dried (MgSO4), filtered, and evaporated to afford 4-(2,3-dimethoxyphenyl)4-piperidinylmethanone as an oil.
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