Sodium Chloride → HCID 54067472, compound

Participants

Reaction Conditions

Reaction Steps

Silver tetrafluoroborate (323 mg) was added to a stirred mixture of methyl 2-[(3S,4R)-4-chloro-2-oxo-3-phthalimidoazetidin-1-yl]-3-methylbut-2-enoate (500 mg) and methyl 3-(trimethylsilylmethyl)-but-3-enoate (460 mg) in dichloromethane (2.5 ml) at -78° C. under a nitrogen atmosphere. The stirring mixture was gradually allowed to warm to 0° C. during one hour and kept at 0° C. for 1.5 hours. A saturated aqueous sodium chloride (2 ml) was added and the heterogeneous mixture was brought to pH 7 with a saturated aqueous sodium bicarbonate. After stirring for 15 minutes, the mixture was diluted with ethyl acetate and filtered through a pad of Celite. The organic layer was separated, washed with brine, dried over magnesium sulfate, and evaporated. The residue was chromatographed on silica gel (10 g) eluting with a mixture of benzene and acetone (5:1). Further purification on a silica gel (10 g) eluting with 10-20% ethyl acetate in dichloromethane) afforded methyl 2-[(3R,4R)-4-[2-(methoxycarbonylmethyl)allyl]-2-oxo-3-phthalimidoazetidin-1-yl]-3-methylbut-2-enoate (483 mg) as an oil.

Provenance & Evidence