Synthesis 2025; 57(20): 2969-2976
DOI: 10.1055/a-2642-4514
Paper

Straightforward Synthesis of Functionalized l-Quinovosamine Thioglycoside Derivatives and Their Direct Use in the Synthesis of the Tetrasaccharide Corresponding to the Cell Wall of Escherichia coli O98

Authors

  • Saikat Dogra

    Department of Chemical Sciences, Bose Institute, Kolkata, India
  • Samim Sahaji

    Department of Chemical Sciences, Bose Institute, Kolkata, India
  • Anup Kumar Misra

    Department of Chemical Sciences, Bose Institute, Kolkata, India


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Abstract

Synthesis of functionalized l-quinovosamine thioglycoside was achieved in very good yield using simple functional group manipulation of l-rhamnose. l-quinovosamine thioglycoside derivatives have been successfully used in the total synthesis of the tetrasaccharide repeating unit of the cell wall O-antigen of Escherichia coli O98 strain. Two units of l-quinovosamine thioglycoside were stereoselectively glycosylated during the synthesis of the tetrasaccharide. In addition, direct conversion of azido groups into acetamido functionality and TEMPO-mediated (diacetoxyiodo)benzene (DAIB) oxidation of a primary hydroxyl group to a carboxylic group are noteworthy features of the synthetic strategy.

Supplementary Material



Publication History

Received: 29 April 2025

Accepted after revision: 24 June 2025

Article published online:
08 August 2025

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