Synthesis of β-(1 → 6)-Branched (1 → 3)-Glucononaoside with Alternate β-and α-Bonds in the Backbone

Lauryl glycoside of β-D-Gicp-(1 → 3)-[β-D-Glcp-(1 → 6)-] a-D-Glcp-(1 → 3)-β-D-Glcp-(1 → 3)-[β-D-Glcp-(1 → 6)-] a-D-Glcp-(1 → 3)-β-D-Glcp-(1 → 3)-[β-D-Glcp-(1 → 6)-]β-D-Glcp was synthesized through 3 + 3 + 3 strategy. 3-O-Allyl-2, 4, 6-tri-O-benzoyl-β-D-glucopyranosyl-(1 → 3)-[2, 3, 4, 6-tetra-O-benzoyl-β-D-glucopyranosyl-(1 → 6)-] 1, 2-O-isopropylidene-a-D-glucofuranose was used as the key intermediate which was converted to the corresponding trisaccharide donor and acceptor readily.