Acetic Acid → tert-Butyl(1-benzylpiperidin-3-yl)carbamate, (R)-

Participants

Reaction Steps

To a solution of (R)-tert-butyl piperidin-3-ylcarbamate (500 mg, 2.4 mmol) in MeOH (15 mL), AcOH (0.75 mL, 12.4 mmol) and NaCNBH3 (310 mg, 4.8 mmol) were added sequentially. To this stirred solution was added benzaldehyde (0.25 mL, 2.4 mmol) drop-wise. The reaction mixture was stirred at rt for 60 h before saturated K2CO3(aq) solution was added to neutralize it. The reaction mixture was concentrated in vacuo to give a residue which was dissolved in water and extracted with EtOAc (30 mL×3). The combined EtOAc layer was dried over Na2SO4 and concentrated in vacuo to afford the titled intermediate (725 mg, 48%) that was used in the next step without further purification. LC-MS: m/z [M+1]=291.

Provenance & Evidence