Formaldehyde → (2S,3S,4S,5R,6S)-3,4,5-tribenzyloxy-6-[4-chloro-3-[[4-(2,2-difluoroethoxy)phenyl]methyl]phenyl]-2-(hydroxymethyl)-6-methoxy-tetrahydropyran-2-carbaldehyde

Temperature

70 °C

(2S,3S,4S,5R,6S)-3,4,5-tribenzyloxy-6-[4-chloro-3-[[4-(2,2-difluoroethoxy)phenyl]methyl]phenyl]-6-methoxy-tetrahydropyran-2-carbaldehyde 12i (1.10 g, 1.48 mmol) was dissolved in 20 mL 1,4-dioxane, followed by addition of 2.5 mL of 37% formaldehyde solution and dropwise addition of 4 mL of 2.9 M sodium hydroxide solution. The reaction mixture was stirred for 25 hours at 70° C. Thereafter, the reaction mixture was concentrated under reduced pressure before 20 mL water and 10 mL saturated sodium chloride solution were added. The aqueous phase was extracted with ethyl acetate (30 mL×3) and the organic extract was 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-(2,2-difluoroethoxy)phenyl]methyl]phenyl]-2-(hydroxymethyl)-6-methoxy-tetrahydropyran-2-carbaldehyde 12j (1.09 g, yellow grease), which was used directly in the next step without purification.

1. concentrationThereafter, the reaction mixture was concentrated under reduced pressure before 20 mL water and 10 mL saturated sodium chloride solution
2. additionwere added
3. extractionThe aqueous phase was extracted with ethyl acetate (30 mL×3)
4. extractionthe organic extract
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationfiltered
7. concentrationThe filtrate was concentrated under reduced pressure

ORD record

ord-ffb240b5ae4241d48f78db21c877dce6

Source dataset

uspto-grants-2013_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08609622B2