Trifluoroacetic acid → HCID 22913027, compound

Participants

Reaction Steps

1,1-Dimethylethyl 4-[bis(phenylmethyl)amino]-1-piperidinecarboxylate D29 (160 g, 420 mmol) was dissolved in dichloromethane (DCM) (1 L) and TFA (188 mL, 2443 mmol) was added dropwise at room temperature. The resulting mixture was stirred for 3 h then further 100 mL of TFA was added and stirred for 2 h. The mixture was concentrated under reduced pressure and the residue treated with saturated solution NaHCO3 (1.5 L) and NaOH (3M solution; 200 mL) to basic pH. The aqueous phase was extracted with DCM (2×1.5 L). Combined organic layers were diluted with ethyl acetate (100 mL), washed with water (1×1 L) and brine (1×1 L) then dried on Na2SO4 and concentrated to obtain title material (118 g; 100%).

Provenance & Evidence