Benzyl Bromide → HCID 24875734, compound

Participants

Reaction Steps

To the crude 7-[(1R,2R,3R,5S)-2-(4,4-difluoro-3-hydroxyoctyl)-5-hydroxy-3-(2-tetrahydropyranyloxy)cyclopentyl]heptanoic acid (17) (132.1 mmol) in acetonitrile (315 ml), diisopropyl ethylamine (69.0 ml, 369 mmol) and benzyl bromide (47.1 ml, 369 mmol) were added and the mixture was stirred for 14 hours at room temperature. The reaction mixture was concentrated under reduced pressure, ethyl acetate (366 ml) and water (280 ml) were added to the residue and the mixture was stirred, let to stand and then separated into two layers. The aqueous layer was extracted twice with ethyl acetate (224 ml). The organic layers were combined and washed with 1N-hydrochloric acid (336 ml), saturated sodium bicarbonate water (336 ml) and saturated aqueous sodium chloride (336 ml). After drying with anhydrous magnesium sulfate (51 g), the solution was concentrated under reduced pressure. The concentration residue was purified by silica gel column chromatography (Fuji Silysia BW-300: 2400 g; ethyl acetate:hexane=1:2) to give benzyl 7-[(1R,2R,3R,5S)-2-(4,4-difluoro-3-hydroxyoctyl)-5-hydroxy-3-(2-tetrahydropyranyloxy)cyclopentyl]heptanate (18) (74.44 g; 130.9 mmol; yield: 99.1%) as a colorless oil.

Provenance & Evidence