Synthesis
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

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
› Author Affiliations


Preview

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

© 2025. Thieme. All rights reserved.

Georg Thieme Verlag KG
Oswald-Hesse-Straße 50, 70469 Stuttgart, Germany