[CH3:1][O:2][C:3]([C:5]1[CH:6]=[CH:7][C:8]([N+:14]([O-:16])=[O:15])=[C:9]([CH:13]=1)[C:10]([OH:12])=O)=[O:4].Cl.[NH:18]1[CH2:23][CH2:22][CH:21]([C:24]([O:26][CH3:27])=[O:25])[CH2:20][CH2:19]1>>[CH3:1][O:2][C:3]([C:5]1[CH:6]=[CH:7][C:8]([N+:14]([O-:16])=[O:15])=[C:9]([CH:13]=1)[C:10]([N:18]1[CH2:23][CH2:22][CH:21]([C:24]([O:26][CH3:27])=[O:25])[CH2:20][CH2:19]1)=[O:12])=[O:4]Methyl 1-[5-(methoxycarbonyl)-2-nitrobenzoyl]-4-piperidinecarboxylate is prepared in analogy to the process described in Example IX from 5-(methoxycarbonyl)-2-nitrobenzoic acid and methyl piperidine-4-carboxylate hydrochloride.
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