N-(tert-butoxycarbonyl)glycine → Methyl 1-(2-(tert-butoxycarbonylamino)acetyl)-4-(hydroxymethyl)piperidine-4-carboxylate

Participants

Reaction Steps

To a solution of Boc-Gly-OH (331 mg, 1.89 mmol, 1.1 equiv.) in DMF (1 mL) was added HBTU (718 mg, 1.89 mmol, 1.1 equiv.), followed by addition of methyl 4-(hydroxymethyl)piperidine-4-carboxylate (1.72 mmol, 1 equiv.) and DIEA (749 μL, 4.30 mmol, 2.5 equiv.) at rt. The reaction mixture was stirred for 1 h. The mixture was partitioned between EtOAc and H2O. The organic layer was washed by saturated NaHCO3, water and brine, dried over Na2SO4, and concentrated. The resulting residue was purified by column chromatography to give methyl 1-(2-(tert-butoxycarbonylamino)acetyl)-4-(hydroxymethyl)piperidine-4-carboxylate (560 mg, 98%, two steps). LRMS (M-Boc+H+) m/z 231.1.

Provenance & Evidence