Reaction of 2,3,4,6-tetra-O-acetyl-α-D-galactopyranosyl bromide with benzyl 2-acetamido-3-O-allyl-6-O-benzyl-2-deoxy-α-D-glucopyranoside in 1,2-dichloroethane in the presence of mercuric bromide and molecular sieves (4 Å) provided crystalline benzyl 2-acetamido-4-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-3-O-allyl6-O-benzyl-2-deoxy-α-D-glucopyranoside in 77% yield. Deallylation with chloro(tristriphenylphosphine)rhodium(I) followed by condensation with 2,3,4-tri-O-benzyl-α-L-fucopyranosyl bromide provided the derivative (14). The title trisaccharide was obtained after O-deacetylation followed by catalytic hydrogenolysis.
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Journal of the Chemical Society, Perkin Transactions 1
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