Methyl iodide → (3r,4r)-Rel-tert-butyl 4-azido-3-methoxypiperidine-1-carboxylate

Participants

Reaction Steps

To a stirred mixture of 146A (320 mg, 1.32 mmol) and iodomethane (0.25 mL, 3.96 mmol) in 4 mL of dry THF at room temperature under nitrogen was added 95% NaH (40.0 mg. 1.58 mmol). This mixture was stirred at room temperature for 15 h and then quenched by addition of 30 mL of water. The aqueous solution was extracted with EtOAc (2×40 mL). The combined EtOAc extracts were washed with brine (30 mL), dried (MgSO4), filtered and concentrated in vacuo to give 310 mg (Yield: 92%) of 247A. It had an analytical HPLC retention time=2.86 min. (Phenomenox S5 C18-HC 4.6×50 mm column, 10-90% aqueous methanol over 4 minutes containing 0.1% TFA, 4 ml/min, monitoring at 220 nm) and a LC/MS M++Na=279.

Provenance & Evidence