Boron tribromide → 3-((3S,4S)-3-fluoro-4-(3-fluoro-4-hydroxyphenyl)piperidin-1-yl)-1-(3-fluoro-4-methyl-benzyl)pyrrolidin-2-one

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Reaction Steps

To a stirring solution of 3-((3S,4S)-3-fluoro-4-(3-fluoro-4-methoxyphenyl)piperidin-1-yl)-1-(3-fluoro-4-methylbenzyl)pyrrolidin-2-one (60 mg, 0.14 mmol, diastereomeric mixture from step H) in 10 mL of DCM at −78° C. was added 2.5 mL of boron tribromide (2.5 mmole) and the mixture allowed to warm to rt and stirred for 3 h. The reaction mixture was then cooled to 0° C. and quenched with saturated NaHCO3 solution. The mixture was then diluted with DCM and the organic layer was separated and evaporated under reduced pressure. The crude compound was purified by preparative HPLC to give 3-((3S,4S)-3-fluoro-4-(3-fluoro-4-hydroxyphenyl)piperidin-1-yl)-1-(3-fluoro-4-methyl-benzyl)pyrrolidin-2-one (20 mg, 0.047 mmol, 34% yield) (diastereomeric pair). LCMS (Method Q) RT=1.17 min, m/z 419.0 (M+H+).

Provenance & Evidence