Methyl iodide → 1-(4-chlorobenzyl)-1-methyl-4-[[N-[3-(trifluoromethyl)benzoyl]glycyl]aminomethyl]piperidinium iodide

A solution of 4-[{N-(3-(trifluoromethyl)benzoyl)glycyl}aminomethyl]piperidine (30 mg, 0.087 mmol) in CH3CN (1.0 mL) and (piperidinomethyl)polystyrene (80 mg, 2.7 mmol base/g resin) were added to a solution of 4-chlorobenzyl chloride (11.7 mg, 0.073 mmol) in CH3CN (1.0 mL). The reaction mixture was stirred at 60° C. for 2 h. Phenyl isocyanate (10.4 mg, 0.087 mmol) was added to the cooled reaction mixture and the mixture was stirred at 25° C. for 1 h. The reaction mixture was loaded onto Varian™ SCX column and washed with CH3OH (20 mL). Product was eluted off using 2 N NH3 in CH3OH (6 mL) and concentrated to afford 1-(4-chlorobenzyl)-4-[{N-(3-(trifluoromethyl)benzoyl)glycyl}aminomethyl]piperidine as a colorless oil used without purification. Iodomethane (28 mg, 0.20 mmol) was added to a solution of 1-(4-chlorobenzyl)-4-[{N-(3-(trifluoromethyl)benzoyl)glycyl}aminomethyl]piperidine in CH3CN (2.0 mL) and the reaction mixture was stirred at 70° C. for 4 h. The solvent was removed under reduced pressure to afford 1-(4-chlorobenzyl)-1-methyl-4-[{N-(3-(trifluoromethyl)benzoyl)glycyl}aminomethyl]piperidinium iodide as a pale yellow oil (31.7 mg, 71%): The purity was determined by RPLC/MS (99%;); ESI/MS m/e 482.1 (M+, C24H28ClF3N3O2).