Methyl iodide → HCID 67092407, compound

Participants

Reaction Steps

LHMDS (1 M solution in THF, 2.32 mL, 2.32 mmol) was added slowly to a cooled (−50° C.) solution of 1-(2,6-dimethylphenyl)-3-(4-methoxybenzyloxymethyl)-5-oxo-pyrrolidine-3-carboxylic acid methyl ester (prepared from step a, 767 mg,1.93 mmol) in THF (7 mL). After 5 min, iodomethane (602 μL, 9.65 mmol) was added at −50° C. and the resulting reaction mixture was warmed to room temperature and stirred further for 2 h. Saturated aqueous NH4Cl solution (25 mL) was added, and the solution was extracted with EtOAc (3×50 mL). The combined organic layers were washed with water (75 mL), brine (75 mL), dried (Na2SO4) and evaporated. The residue was purified by flash chromatography (SiO2, 20→70% EtOAc/hexanes) to give 1-(2,6-dimethylphenyl)-3-(4-methoxybenzyloxymethyl)-4-methyl-5-oxo-pyrrolidine-3-carboxylic acid methyl ester (736 mg, 93% yield). LC-MS: Rt (retention time): 2.39 min, MS: (ES) m/z 412.4 (M+H+).

Provenance & Evidence