638
3
Chemical Glycosylation Reactions
⊡ Scheme 67
Synthesis of octaarabinose 417
with 3.7 equiv. of the arabinofuranosyl donor 424, paved the way to pentaarabinofuranoside
425a (82% yield) with complete β-selectivity. The latent BCB arabinofuranoside 425a was
converted into the active CB arabinoside 425b. Finally, coupling of the latter with triarabinofuranosyl acceptor 420, afforded octaarabinofuranoside 417, in 83% yield.
3
Chemical Glycosylation Reactions
⊡ Scheme 67
Synthesis of octaarabinose 417
with 3.7 equiv. of the arabinofuranosyl donor 424, paved the way to pentaarabinofuranoside
425a (82% yield) with complete β-selectivity. The latent BCB arabinofuranoside 425a was
converted into the active CB arabinoside 425b. Finally, coupling of the latter with triarabinofuranosyl acceptor 420, afforded octaarabinofuranoside 417, in 83% yield.