Trifluoroacetic acid → 4-(Mesitylamino)piperidine

Participants

Reaction Steps

After adding trifluoroacetic acid (10 mL) to a solution of tert-butyl 4-(mesitylamino)piperidine-1-carboxylate (5.71 g, 17.9 mmol) in methylene chloride (30 mL), the mixture was stirred at room temperature for 22 hours and then concentrated under reduced pressure. The residue was dissolved in methanol (10 mL), toluene (20 mL) was added, and concentration under reduced pressure was repeated. The residue was purified by silica gel column chromatography (75 g NH silica Chromatorex DM2035, hexane:ethyl acetate=4:1-1:1-chloroform:methanol=10:1) to obtain the title compound as a brown solid (3.57 g) (65% yield, 2 steps).

Provenance & Evidence