F[C:2]1[CH:7]=[CH:6][C:5]([F:8])=[CH:4][C:3]=1[N+:9]([O-:11])=[O:10].[NH:12]1[CH2:17][CH2:16][CH:15]([C:18]([OH:20])=[O:19])[CH2:14][CH2:13]1.CN1C(=O)CCC1.Cl>O>[F:8][C:5]1[CH:6]=[CH:7][C:2]([N:12]2[CH2:17][CH2:16][CH:15]([C:18]([OH:20])=[O:19])[CH2:14][CH2:13]2)=[C:3]([N+:9]([O-:11])=[O:10])[CH:4]=1The mixture consisting of 1.62 g of 2,5-difluoronitrobenzene, 1.9 g of piperidine-4-carboxylic acid and 10 ml of NMP was heated with stirring to 80° C. for 2 hours. After it had been allowed to cool, 30 ml of water were added and the mixture was made weakly acidic using 2N hydrochloric acid and stirred at RT. The precipitated solid was filtered off with suction and dried under reduced pressure.
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