SYNTHESIS OF HEPARIN FRAGMENTS. A CHEMICAL SYNTHESIS OF THE PENTASACCHARIDE O-(2-DEOXY-2-SULFAMIDO-6-O-SULFO-α-D-GLUCOPYRANOSYL)-(1->4)-O-(β-D-GLUCOPYRANOSYLURONIC ACID)-(1->4)-O-(2-DEOXY-2-SULFAMIDO-3,6-DI-O-SULFO-α-D-GLUCOPYRANOSYL)-(1->4)-O-(2-O-SULFO-

Article abstract of DOI:10.1016/S0008-6215(00)90633-5

Known allyl 4,6-O-benzylidene-α-D-glucopyranoside was first converted into methyl (prop-1-enyl 2,3-di-O-benzyl-4-O-chloroacetyl-α-D-glucopyranosid)-uronate.Acid hydrolysis, followed by treatment with (bromomethylene)dimethylammonium bromide, gave methyl (