[F:1][C:2]([F:17])([F:16])[C:3]1[CH:15]=[CH:14][C:6]([O:7][CH:8]2[CH2:13][CH2:12][NH:11][CH2:10][CH2:9]2)=[CH:5][CH:4]=1.[Cl:18][C:19](Cl)([O:21]C(=O)OC(Cl)(Cl)Cl)Cl.N1C=CC=CC=1.C(OCC)(=O)C>C1(C)C=CC=CC=1>[F:17][C:2]([F:1])([F:16])[C:3]1[CH:15]=[CH:14][C:6]([O:7][CH:8]2[CH2:9][CH2:10][N:11]([C:19]([Cl:18])=[O:21])[CH2:12][CH2:13]2)=[CH:5][CH:4]=1A mixture of 4-(4-trifluoromethylphenoxy) piperidine (0.6 g, 2.45 mmol), triphosgene (0.25 g, 0.86 mmol), and pyridine (0.4 ml, 4.90 mmol) in toluene (6 ml) was heated under reflux for 2.5 hours. To which ethyl acetate was added, and the mixture was washed with 10% hydrochloric acid, dried over magnesium sulfate. After filtration, the filtrate was concentrated under reduced pressure to afford 4-(4-trifluoromethylphenoxy)piperidine-1-carbonylchloride (0.72 g, yield 96%) as a pale yellow oil.
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