Synthesis 2018; 50(21): 4270-4282
DOI: 10.1055/s-0037-1609719
paper
© Georg Thieme Verlag Stuttgart · New York

Zwitterionic Polysaccharides of Shigella sonnei: Synthetic Study toward a Ready-for-Oligomerization Building Block Made of Two Rare Amino Sugars

Hélène B. Pfister
a   Institut Pasteur, Unité de Chimie des Biomolécules, 28 rue du Dr Roux, 75724 Paris Cedex 15, France   eMail: laurence.mulard@pasteur.fr
b   CNRS UMR3523, Institut Pasteur, 28 rue du Dr Roux, 75015 Paris, France
c   Université Paris Descartes Sorbonne Paris Cité, Institut Pasteur, 28 rue du Dr Roux, 75015 Paris, France
,
Julie Paoletti
a   Institut Pasteur, Unité de Chimie des Biomolécules, 28 rue du Dr Roux, 75724 Paris Cedex 15, France   eMail: laurence.mulard@pasteur.fr
b   CNRS UMR3523, Institut Pasteur, 28 rue du Dr Roux, 75015 Paris, France
,
Ana Poveda
d   Molecular Recognition & Host-Pathogen Interactions Program, CIC bioGUNE, Bizkaia Technological Park, Bldg 801A, 48160 Derio, Spain
e   Ikerbasque, Basque Foundation for Science, Maria Lopez de Haro 3, 48013 Bilbao, Spain
,
Jesus Jimenez-Barbero
d   Molecular Recognition & Host-Pathogen Interactions Program, CIC bioGUNE, Bizkaia Technological Park, Bldg 801A, 48160 Derio, Spain
e   Ikerbasque, Basque Foundation for Science, Maria Lopez de Haro 3, 48013 Bilbao, Spain
,
Laurence A. Mulard*
a   Institut Pasteur, Unité de Chimie des Biomolécules, 28 rue du Dr Roux, 75724 Paris Cedex 15, France   eMail: laurence.mulard@pasteur.fr
b   CNRS UMR3523, Institut Pasteur, 28 rue du Dr Roux, 75015 Paris, France
› Institutsangaben

This work has received funding from the Institut Pasteur, the MENESR, France (ENS Cachan, PhD fellowship to H. P.) and the European Commission Seventh Framework Program (FP7/2007–2013) under Grant agreement No. 261472-STOPENTERICS, which included a fellowship to J.P.
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Publikationsverlauf

Received: 22. Februar 2018

Accepted after revision: 09. April 2018

Publikationsdatum:
05. Oktober 2018 (online)


Published as part of the Special Section on the 26th French–Japanese Symposium on Medicinal and Fine Chemistry.

Abstract

Shigellosis is an endemic diarrheal disease caused by Gram negative bacteria named Shigella. The most exposed polysaccharides of Shigella sonnei display a zwitterionic disaccharide repeating unit (AB) made of two rare amino sugars: [4)-α-l-AltpNAcA-(1→3)-β-d-FucpNAc4N-(1→]. An original synthesis of a ready-for-oligomerization AB disaccharide is reported. The targeted orthogonally protected disaccharide was synthesized from l-glucose and tetra-O-acetyl-β-d-glucosamine. The challenging introduction of the 4B-azido group masking the amino moiety of the AAT residue was performed at the disaccharide stage by a two-step procedure (triflation followed by nucleo­philic displacement with NaN3). A post-glycosylation oxidation strategy was employed to access the altruronate moiety.

Supporting Information