反应详情

(2S,3R,4S,5S,6R)-2-[4-chloro-3-(2,3-dihydrobenzofuran-5-ylmethyl)phenyl]-6-(hydroxymethyl)-2-methoxy-tetrahydropyran-3,4,5-triol 5e (6.3 g, 14.44 mmol) was dissolved in 60 mL pyridine, followed by addition of 4-dimethylamino pyridine (353 mg, 2.89 mmol) and tert-butyl-dimethyl-chloro-silane (2.61 g, 17.32 mmol) in turn. The reaction mixture was stirred for 16 hours and concentrated under reduced pressure. The resulting residue was dissolved in 200 mL ethyl acetate and partitioned. The organic extract was washed with water (50 mL) and saturated sodium chloride solution (50 mL), combined, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under reduced pressure to obtain the title compound (2S,3R,4S,5S,6R)-6-[(tert-butyl(dimethyl)silyl)oxymethyl]-2-[4-chloro-3-(2,3-dihydrobenzofuran-5-ylmethyl)phenyl]-2-methoxy-tetrahydropyran-3,4,5-triol 5f (7.96 g, pale yellow solid), which was used directly in the next step without purification.

1. concentrationconcentrated under reduced pressure
2. dissolutionThe resulting residue was dissolved in 200 mL ethyl acetate
3. custompartitioned
4. extractionThe organic extract
5. washwas washed with water (50 mL) and saturated sodium chloride solution (50 mL)
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationfiltered
8. concentrationThe filtrate was concentrated under reduced pressure