Methyl iodide → tert-Butyl 4-(2-(benzyl(methyl)amino)ethyl)piperidine-1-carboxylate

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Reaction Steps

At 0° C., a solution of tert-butyl 4-(2-(benzylamino)ethyl)piperidine-1-carboxylate (400 mg, 1.25 mmol, 1 eq) in THF (10 ml) was added dropwise to a suspension of NaH (110 mg, 2.74 mmol, 1.3 eq, 60% in mineral oil) in DMF (4 ml), and stirring was carried out for 30 min. Then a solution of iodomethane (93 μl, 1.5 mmol, 1.2 eq) in THF (2 ml) was added dropwise at 0° C., and stirring was carried out for 2 h at RT. After monitoring by thin-layer chromatography, the reaction mixture was diluted with water (5 ml) and extracted with ethyl acetate (2×50 ml). The combined organic phases were washed with water and sat. NaCl solution (in each case 50 ml), dried over sodium sulfate and concentrated under reduced pressure. After purification by column chromatography (silica gel, 60% ethyl acetate in hexane), a light-yellow solid was obtained. Yield: 34% (140 mg, 0.42 mmol).

Provenance & Evidence