Tetrahydrofuran → (S)-4-benzyl-3-(2-(3,4-dichlorophenyl)pent-4-enoyl)-2-oxazolidinone

Participants

Reaction Steps

Combine (S)-4-benzyl-3-(3,4-dichlorophenyl)acetyl-2-oxazolidinone (13.9 g, 38.2 mmol) and tetrahydrofuran (140 mL). Cool in a dry-ice/acetone bath. Add dropwise a solution of sodium bis(trimethylsilyl)amide (42 mL, 1.0 M in tetrahydrofuran, 42 mmol). After 30 minutes, add allyl iodide (19 g, 114.5 mmol) and then replace the bath with a dry-ice/carbon tetrachloride bath. After 1 hour, partition the reaction the reaction mixture between a saturated aqueous ammonium chloride solution and diethyl ether. Separate the layer, dry the organic layer over MgSO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluting with 5% ethyl acetate/hexane to give (S)-4-benzyl-3-(2-(3,4-dichlorophenyl)pent-4-enoyl)-2-oxazolidinone: Rf=0.50 (silica gel, 20% ethyl acetate/hexane).

Provenance & Evidence