Synthesis
DOI: 10.1055/s-0043-1773517
paper

Synthesis of the Tetrasaccharide Repeating Unit Corresponding to the O-Antigen of Providencia alcalifaciens O7:H7 Strain

Abhijit Rana
,
Anup Kumar Misra
A.R. thanks the Council of Scientific and Industrial Research (CSIR), India for financial support. This work was supported by the Bose Institute (Department of Science and Technology, India) (A.K.M.).


Abstract

Synthesis of the tetrasaccharide corresponding to the O-antigen of Providencia alcalifaciens O7:H7 strain was achieved in satisfactory yield by applying a stereoselective glycosylation strategy. Stereoselective incorporation of β-l-rhamnose, α-d-glucosamine and α-d-glucose moieties in the tetrasaccharide was achieved in very good yield. The d-glucuronic acid moiety in the tetrasaccharide was achieved by late-stage TEMPO–bis(acetoxy)iodobenzene (BAIB)-mediated regioselective oxidation of the primary hydroxyl group of the d-glucose moiety. Thioglycosides were used as glycosyl donors in the presence of a combination of N-iodosuccinimide (NIS) and triflic acid (TfOH) as thiophilic promoter.

Supporting Information



Publication History

Received: 05 December 2024

Accepted after revision: 23 December 2024

Article published online:
10 February 2025

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