Formaldehyde → HCID 86685129, compound

Participants

Reaction Conditions

Reaction Steps

(2S,3S,4S,5R,6S)-3,4,5-tribenzyloxy-6-[4-chloro-3-[(4-ethoxy-3-fluoro-phenyl)methyl]phenyl]-6-methoxy-tetrahydropyran-2-carbaldehyde 4j (7.6 g, 10.45 mmol) was dissolved in 80 mL 1,4-dioxane, followed by addition of 15.8 mL 37% formaldehyde solution and sodium hydroxide (31.35 mL, 31.35 mmol) in turn. The reaction mixture was stirred for 16 hours at 70° C. Thereafter, the reaction mixture was extracted with ethyl acetate (50 mL×4) after 50 mL saturated sodium chloride solution were added. The organic extract was washed with saturated sodium bicarbonate solution (50 mL) and saturated sodium chloride solution (50 mL) and combined, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under reduced pressure to obtain the title compound (2S,3S,4S,5R,6S)-3,4,5-tribenzyloxy-6-[4-chloro-3-[(4-ethoxy-3-fluoro-phenyl)methyl]phenyl]-2-(hydroxymethyl)-6-methoxy-tetrahydropyran-2-carbaldehyde 4k (7.9 g, colourless grease), which was used directly without purification in the next step.

Provenance & Evidence