tert-Butyl 4-oxopiperidine-1-carboxylate → tert-Butyl 4-(methylamino)piperidine-1-carboxylate

Participants

Reaction Steps

tert-Butyl 4-oxopiperidine-1-carboxylate (5.0 g, 25.126 mmol, 1.0 eq.) was dissolved in MeOH (50 ml); AcOH (2 drops) and CH3NH2.HCl (2.2 g, 32.663 mmol, 1.3 eq.) were added and stirring was carried out for 2 hours at RT. NaCNBH3 (3.11 g, 50.25 mmol, 2.0 eq.) was added in portions at 0° C. and the mixture was stirred for 14 hours at RT. The reaction mixture was concentrated under reduced pressure and the residue was purified by column chromatography (Alox, 3% MeOH in DCM). Yield: 55% (3.0 g, 14.019 mmol)

Provenance & Evidence