Benzyl Bromide → benzyl 7-[(1R,2R,3R,5S)-2-((6S)-4,4-difluoro-3-hydroxy-6-methyloctyl)-5-hydroxy-3-(tetrahydro-2H-pyran-2-yloxy)cyclopentyl]heptanoate

To the crude 7-[(1R,2R,3R,5S)-2-((6S)-4,4-difluoro-6-methyl-3-hydroxyoctyl)-5-hydroxy-3-(2-tetrahydropyranyloxy)cyclopentyl]heptanoic acid (F) in acetonitrile (319 ml), diisopropyl ethylamine (68.9 ml, 368 mmol) and benzyl bromide (46.7 ml, 366 mmol) were added and the mixture was stirred for about 13.5 hours at room temperature. The reaction mixture was concentrated under reduced pressure, ethyl acetate (369 ml) and water (283 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 (226 ml). The organic layers were combined and washed with 1M-hydrochloric acid (339 ml), saturated sodium bicarbonate water (339 ml) and saturated aqueous sodium chloride (339 ml). After drying with anhydrous magnesium sulfate (50 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-((6S)-4,4-difluoro-3-hydroxy-6-methyloctyl)-5-hydroxy-3-(tetrahydro-2H-pyran-2-yloxy)cyclopentyl]heptanoate (3) (76.16 g; 130.7 mmol; yield: 98.7%) as a colorless oil.

1. concentrationThe reaction mixture was concentrated under reduced pressure, ethyl acetate (369 ml) and water (283 ml)
2. additionwere added to the residue
3. stirringthe mixture was stirred
4. customseparated into two layers
5. extractionThe aqueous layer was extracted twice with ethyl acetate (226 ml)
6. washwashed with 1M-hydrochloric acid (339 ml), saturated sodium bicarbonate water (339 ml) and saturated aqueous sodium chloride (339 ml)
7. dry with materialAfter drying with anhydrous magnesium sulfate (50 g)
8. concentrationthe solution was concentrated under reduced pressure
9. customThe concentration residue was purified by silica gel column chromatography (Fuji Silysia BW-300: 2400 g; ethyl acetate:hexane=1:2)

ORD-Eintrag

ord-182d92cc8c7b4dab9029b37f6316b8fd

Quelldatensatz

uspto-grants-2016_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09242950B2