Trifluoroacetic acid → 1-(4-Methoxybenzyl)piperidin-4-amine

Participants

Reaction Steps

A mixture of 1,1-dimethylethyl 1-[(4-methoxyphenyl)methyl]-4-piperidinylcarbamate (0.02 mole) and trifluoroacetic acid (0.01 mole) in 50 ml. of methylene chloride was refluxed for a 3 hr. period. Additional trifluoroacetic acid (0.08 mole) was added and reflux continued for an additional 30 minutes. The crude solution was evaporated in vacuo, residual material dissolved in water and the aqueous phase washed with ether and then made basic with 50% sodium hydroxide. Extraction of the basified solution with chloroform, drying of the chloroform extracts, and removal of the solvent afforded 4-amino-1-[(4-methoxyphenyl)methyl]piperidine in nearly quantitative yield.

Provenance & Evidence