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. 2015 Feb 20;17(4):928-31.
doi: 10.1021/acs.orglett.5b00031. Epub 2015 Feb 6.

Synthesis of Staphylococcus aureus Type 5 trisaccharide repeating unit: solving the problem of lactamization

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Synthesis of Staphylococcus aureus Type 5 trisaccharide repeating unit: solving the problem of lactamization

Ivan A Gagarinov et al. Org Lett. .

Abstract

The chemical synthesis of an orthogonally protected trisaccharide derived from the polysaccharide of Staphylococcus aureus Type 5, which is an attractive candidate for the development of immunotherapies, is described. The challenging α-fucosylation and β-mannosylation are addressed through the careful choice of protecting groups. Lactamization of a β-D-ManpNAcA moiety during deprotection was avoided by a late stage oxidation approach. Versatility of the trisaccharide was demonstrated by its transformation into a spacer-containing repeating unit suitable for immunological investigations.

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Figures

Figure 1
Figure 1
Retrosynthetic analysis.
Scheme 1
Scheme 1
Attempted Assembly of Trisaccharide 6
Scheme 2
Scheme 2
Improved Assembly of Target Trisaccharide 4

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