Ym. Zhang et al., SYNTHESIS OF A NONASACCHARIDE WITH 2 LEWIS-X TRISACCHARIDES ANCHORED ONTO A BRANCHED TRIMANNOSIDE, Tetrahedron : asymmetry, 6(5), 1995, pp. 1195-1216
Double condensation of phenyl enzyl-2-O-[6-O-benzyl-2-deoxy-2-phthalim
ido-4-O-(2 zyl-alpha-L-fucopyranosyl)-beta-D-glucopyranosyl]- 1-thio-a
lpha-D-mannopyranoside 31 with methyl 2,4-di-O-benzyl-beta-D-mannopyra
noside 35, in the presence of N-iodosuccinimide/trifluoromethane-sulfo
nic acid, gave the protected nonasaccharide 36 in 60% yield. Conventio
nal deprotection gave the nonasaccharide 1, in which two Lewis x trisa
ccharides are anchored onto a branched trimannoside.