Trifluoroacetic acid → (R)-N-[2-(4-Methoxybenzoylamino)-2-phenylethyl]piperidine-4-carboxamide trifluoroacetate

Participants

Reaction Steps

(Deprotection Method A) Trifluoroacetic acid was added to a stirring suspension of (R)-N-[2-(4-methoxybenzoylamino)-2-phenylethyl]-1-tert-butoxycarbonylpiperidine-4-carboxamide (2.0 g, 4.2 mmol), methylene chloride (20 mL), and anisole (0.5 g, 4.6 mmol) at room temperature. A solution was obtained and bubbling was observed. After 1 h, the reaction mixture was evaporated at 40° C. The residue was taken up in warm methanol, and to this stirring solution was added ether to precipitate the product. The precipitate was collected by vacuum filtration, washed with ethyl acetate, then dried under vacuum at 60° C. overnight to afford 1.9 g (92%) of a white solid

Provenance & Evidence