Tert-butyl 3-benzoylpiperidine-1-carboxylate → Tert-butyl 3-(1-hydroxy-1-phenylheptyl)piperidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a 100-mL round bottom flask were added tert-butyl 3-(benzoyl)piperidine-1-carboxylate (0.4733 g, 1.63 mmol, 1.0 equiv) and THF (5 mL). The flask was evacuated and refilled with N2. The mixture was cooled with a dry ice-acetone bath and hexylmagnesium bromide (2.0M solution in Et2O, 2.5 mL, 5.0 mmol, 3.0 equiv) was added. The reaction mixture was allowed to slowly warm to −10° C. while stirring overnight (17 h). The mixture was quenched with saturated NH4Cl (10 mL), extracted three times with EtOAc, and dried over Na2SO4. The crude product was purified by reversed-phase HPLC (XTerra® Prep MS C18 OBD™ Column, 5 μm, 19×50 mm, 10%→90% CH3CN/H2O, 0.1% CF3COOH over 8 min, flow rate 20 mL/min) to give tert-butyl 3-(1-hydroxy-1-phenylheptyl)piperidine-1-carboxylate. LC-MS (3 min) tR=2.41 min, m/z 398 (M+Na+), 376 (MH+), 302, 276, 258.

Provenance & Evidence