Synthesis of an immunologically active component of the extracellular polysaccharide produced by Aspergillus and Penicillium species

Abstract
The synthesis of an immunologically active component of the extracellular polysaccharide produced by Aspergillus and Penicillium species, in the form of tetrameric β(1→ 5) interlinked D‐galactofuranoside, is described. Key reactions are the assemblage of a galactofuranosyl donor, having a selective removable protecting group at C‐5, and a stepwise elongation‐deprotection procedure. Furthermore, the synthesis of β(1→ 2), β(1 → 3) and β(1 → 6) D‐galactofuranosyl dimers is reported.