Trifluoroacetic acid → 4-(4-(Trifluoromethyl)phenoxy)piperidine
反応式
[F:1][C:2]([F:24])([F:23])[C:3]1[CH:22]=[CH:21][C:6]([O:7][CH:8]2[CH2:13][CH2:12][N:11](C(OC(C)(C)C)=O)[CH2:10][CH2:9]2)=[CH:5][CH:4]=1.FC(F)(F)C(O)=O>C(Cl)Cl>[F:24][C:2]([F:1])([F:23])[C:3]1[CH:22]=[CH:21][C:6]([O:7][CH:8]2[CH2:9][CH2:10][NH:11][CH2:12][CH2:13]2)=[CH:5][CH:4]=1参加物
4
実験手順
Tert-butyl 4-(4-trifluoromethylphenoxy)piperidine-1-carboxylate (1.13 g, 3.27 mmol) prepared in Reference Example 37 was dissolved in methylene chloride (10 ml). To which trifluoroacetic acid (10 ml) was added dropwise and the mixture was stirred at room temperature for 5 hours. After the reaction mixture was concentrated under reduced pressure, the residue was again dissolved in methylene chloride. The solution was neutralized with a sodium hydroxide aqueous solution, and the mixture was extracted with methylene chloride. The extract was washed with brine, dried over magnesium sulfate, and then filtered. The filtrate was concentrated under reduced pressure to afford 4-(4-trifluoromethylphenoxy)piperidine (727 mg, yield 91%) as a white powder.