1,2-Dimethoxyethane → 7-{(R)-2-[(E)-3-(3-benzyl-phenyl)-3-hydroxy-propenyl]-5-oxo-pyrrolidin-1-yl}-heptanoic acid ethyl ester

Participants

Reaction Steps

To 60% sodium hydride in mineral oil (20 mg, 0.51 mmol) was added a DME solution (5 mL) of [2-(3-benzyl-phenyl)-2-oxo-ethyl]-phosphonic acid dimethyl ester (164 mg, 0.51 mmol). After 1.5 h a DME solution (5 mL) of 7-((R)-2-formyl-5-oxo-pyrrolidin-1-yl)-heptanoic acid ethyl ester (126 mg, 0.47 mmol) was added. The reaction mixture was stirred for 45 min. at room temperature then diluted with ethyl acetate and washed with an aqueous NaHCO3 solution. The organic layer was dried over MgSO4, filtered and concentrated. The residue was subjected to column chromatography (2.5 ethyl acetate: 1 hexanes) to provide 7-{(R)-2-[(E)-3-(3-benzyl-phenyl)-3-hydroxy-propenyl]-5-oxo-pyrrolidin-1-yl}-heptanoic acid ethyl ester (112 mg, 0.24 mmol) as an oil.

Provenance & Evidence