Glycosyl Trichloroacetimidates
3.2
487
from building blocks 20a, 20b, and 20f via intermediates 20c, d, e protected Lewis X intermediate 20g was obtained which gave monomer 20h. For the dimerization, via 20i, j, the
target molecule 20k was obtained. The synthesis of sialyl Lewis X containing glycolipids
with different core structures [136] exhibited the importance of the spacer in selectin-binding
⊡ Scheme 23