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Exploratory N‐Protecting Group Manipulation for the Total Synthesis of Zwitterionic Shigella sonnei Oligosaccharides

Abstract : Shigella sonnei surface polysaccharides are well-established protective antigens against this major causeo fd iarrhoeal disease.T hey also qualify as unique zwitterionic polysaccharides (ZPSs)f eaturing ad isaccharide repeating unit made of two 1,2-trans linked rare aminodeoxy sugars, a 2-acetamido-2-deoxy-l-altruronic acid (l-AltpNAcA)a nd a2acetamido-4-amino-2,4,6-trideoxy-d-galactopyranose (AAT). Herein,t he stereoselective synthesis of S. sonnei oligosaccharides comprising two, three and four repeating units is reported for the first time. Severals ets of up to seven pro-tectingg roups wereexplored,s hedding light on the singular conformational behavior of protected altrosamine and altruronic residues. Ad isaccharide buildingb lock equipped with three distinct N-protectingg roups and featuring the uronate moiety already in place was designed to accomplish the iterative high yieldingg lycosylation at the axial 4-OH of the altruronate componenta nd achieve the challenging full deprotection step. Key to the successfulr oute was the use of a diacetyls trategy whereby the N-acetamido group of the l-AltpNAcAism asked in the form of an imide.
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https://hal-pasteur.archives-ouvertes.fr/pasteur-03722328
Contributor : Laurence Mulard Connect in order to contact the contributor
Submitted on : Wednesday, July 13, 2022 - 12:42:41 PM
Last modification on : Tuesday, July 19, 2022 - 3:07:41 AM

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Debashis Dhara, Laurence A Mulard. Exploratory N‐Protecting Group Manipulation for the Total Synthesis of Zwitterionic Shigella sonnei Oligosaccharides. Chemistry - A European Journal, Wiley-VCH Verlag, 2021, 27 (18), pp.5694 - 5711. ⟨10.1002/chem.202003480⟩. ⟨pasteur-03722328⟩

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