Synthesis of betaglycan-type tetraosyl hexapeptide: a possible precursor regulating enzymatic elongation toward heparin

Tetraosyl hexapeptide, a part of the sequence of betaglycan: β- -GlcA-(1→3)-β- -Gal-(1→3)-β- -Gal-(1→4)-β- -Xyl-(1→O-SerGlyTrpProAspGly (1), which was designed as a probe for glycan elongation toward heparin, was synthesized in a stereocontrolled manner.