Iodoethane → 2-(4-{[(2R,3S,4R,5S)-3-(3-chloro-2-fluoro-phenyl)-4-(4-chloro-2-fluoro-phenyl)-4-cyano-5-(2,2-dimethyl-propyl)-pyrrolidine-2-carbonyl]-amino}-phenyl)-butyric acid methyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of chiral (4-{[(2R,3S,4R,5S)-3-(3-chloro-2-fluoro-phenyl)-4-(4-chloro-2-fluoro-phenyl)-4-cyano-5-(2,2-dimethyl-propyl)-pyrrolidine-2-carbonyl]-amino}-phenyl)-acetic acid methyl ester (22 mg, 0.036 mmol) was dissolved in THF (1 mL) and cooled to −78° C., then LHMDS (1 mL, 1M in THF) was added and the mixture stirred 15 min at −78° C. Ethyl iodide (0.1 mL, 0.107 mmol) was added and stirred for 1 h at −78° C., then warmed to 1 h at room temperature. The mixture was diluted with sat'd ammonium chloride solution extracted with ethyl acetate, the organic layer was separated then concentrated under reduced pressure to afford an oil that was purified by silica column chromatography (4 g Analogix column, 1-100% EtOAc/heptane) to afford 2-(4-{[(2R,3S,4R,5S)-3-(3-chloro-2-fluoro-phenyl)-4-(4-chloro-2-fluoro-phenyl)-4-cyano-5-(2,2-dimethyl-propyl)-pyrrolidine-2-carbonyl]-amino}-phenyl)-butyric acid methyl ester as a light yellow foam (12.4 mg, 53.9%). LCMS (ES+) m/z Calcd for C34H35Cl2F2N3O3+H [(M+H)+]: 641.20. found: 642.2.

Provenance & Evidence