Trifluoroacetic acid → HCID 59722656, compound

Participants

Reaction Steps

Trifluoroacetic acid (35 mL) was added to a solution of (3S,6S)-3-allyl-6-(2,3-difluorophenyl)-1-(2,4-dimethoxybenzyl)azepan-2-one and (3R,6R)-3-allyl-6-(2,3-difluorophenyl)-1-(2,4-dimethoxybenzyl)azepan-2-one (3.39 g, 8.15 mol) in dichloromethane (25 mL). After 2.5 h, the reaction mixture was concentrated. Saturated aqueous sodium bicarbonate was added and the mixture was extracted with ethyl acetate (3×). The organic extracts were washed with saturated brine, dried over magnesium sulfate, filtered and concentrated to give the title compound. Purification by silica gel chromatography (98.5% dichloromethane/methanol→97% dichloromethane/methanol) gave the mixture of racemic trans compounds (3S,6S)-3-allyl-6-(2,3-difluorophenyl)azepan-2-one and (3R,6R)-3-allyl-6-(2,3-difluorophenyl)azepan-2-one and racemic cis compounds (3S,6R)-3-allyl-6-(2,3-difluorophenyl)azepan-2-one and (3R,6S)-3-allyl-6-(2,3-difluorophenyl)azepan-2-one. MS 266.1 (M+1).

Provenance & Evidence