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(2S,3R,4S,5S,6R)-6-[(tert-butyl(dimethyl)silyl)oxymethyl]-2-[4-chloro-3-[[4-(2,2,2-trifluoroethoxy)phenyl]methyl]phenyl]-2-methoxy-tetrahydropyran-3,4,5-triol 7f (2.90 g, 4.78 mmol) was dissolved in 70 mL DMF and cooled to 0° C., followed by addition of 60% NaH (955 mg, 23.9 mmol). The reaction mixture was warmed and stirred for 1 hour at room temperature before benzyl bromide (3.0 mL, 23.9 mmol) was added. After stirring for 3 hours, 5 mL methanol and 10 mL water were added. The reaction mixture was partitioned after 100 mL water and 30 mL saturated sodium chloride solution were added. The aqueous phase was extracted with ethyl acetate (50 mL×3) and the organic extract was washed with saturated sodium chloride solution (30 mL) and combined, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under reduced pressure to obtain the title compound [[(2R,3R,4S,5R,6S)-3,4,5-tribenzyloxy-6-[4-chloro-3-[[4-(2,2,2-trifluoroethoxy)phen yl]methyl]phenyl]-6-methoxy-tetrahydropyran-2-yl]methoxy]tert-butyl-dimethyl-silane 7g (4.60 g, pale yellow liquid), which was used directly in the next step without purification.

1. temperatureThe reaction mixture was warmed
2. additionwas added
3. customThe reaction mixture was partitioned after 100 mL water and 30 mL saturated sodium chloride solution
4. additionwere added
5. extractionThe aqueous phase was extracted with ethyl acetate (50 mL×3)
6. extractionthe organic extract
7. washwas washed with saturated sodium chloride solution (30 mL)
8. dry with materialdried over anhydrous magnesium sulfate
9. filtrationfiltered
10. concentrationThe filtrate was concentrated under reduced pressure