Trifluoroacetic acid → 4-[(3,3-Difluoropyrrolidin-1-yl)methyl]piperidine
Reaction equation
C(O)(C(F)(F)F)=O.[F:8][C:9]1([F:28])[CH2:13][CH2:12][N:11]([CH2:14][CH:15]2[CH2:20][CH2:19][N:18](C(OC(C)(C)C)=O)[CH2:17][CH2:16]2)[CH2:10]1>C(Cl)Cl>[F:28][C:9]1([F:8])[CH2:13][CH2:12][N:11]([CH2:14][CH:15]2[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]2)[CH2:10]1Participants
4
Procedure
TFA (766.5 mg, 517 μL, 6.722 mmol) was added to a stirred solution of tert-butyl 4-[(3,3-difluoropyrrolidin-1-yl)methyl]piperidine-1-carboxylate (2.046 g, 6.722 mmol) in DCM (15 mL) and the reaction stirred at ambient temperature for 66 hours. The solvent was removed in vacuo and the residue azeotroped with DCM (×2) and ether (×2). The residue was passed through a 50 g SCX-2 cartridge and washed with MeOH/DCM mixtures. The product was eluted by washing the cartridge with 2M NH3 in MeOH/DCM mixtures. The solvent was removed in vacuo to give 4-((3,3-difluoropyrrolidin-1-yl)methyl)piperidine as a pale yellow solid (1.15 g, 84% Yield over 2 steps). MS (ES+) 205.1.