Methanol → Methyl(3S,4R)-1-benzyl-4-(2,4-difluorophenyl)pyrrolidine-3-carboxylate

Participants

Reaction Steps

Samarium triflate (6.32 g, 10 mmol) was added to a stirred solution of (4R)-4-benzyl-3-{[(3S,4R)-1-benzyl-4-(2,4-difluorophenyl)pyrrolidin-3-yl]carbonyl}-1,3-oxazolidin-2-one, from preparation 29 (63 g, 130 mmol) in methanol (350 mL) at room temperature. The reaction mixture was stirred for 24 hours and the solvent was removed in vacuo. Dichloromethane (290 mL) was added followed by saturated sodium hydrogen carbonate solution (140 mL) and the mixture stirred for 15 minutes. The resulting precipitate was filtered and washed with dichloromethane (250 mL) and water (25 mL). The phases were separated and the aqueous layer was extracted with dichloromethane (2×40 mL). The organic extracts were combined, dried over magnesium sulfate, filtered and concentrated in vacuo to give the crude residue. The residue was suspended in warm cyclohexane (300 mL) and shaken till formation of a solid occurred. The mixture was allowed to stand at room temperature for 24 hours. The solid was filtered and washed with cold cyclohexane (150 mL). The filtrate was concentrated in vacuo to afford the desired compound, 38 g (87%).

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