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- W4385549706 abstract "Comprehensive Summary L‐Hexoses are key components of many biologically relevant natural products and pharmaceuticals. As rare sugars, L‐hexoses are not readily obtained from natural sources. Access to L‐hexose building blocks from commercially available and inexpensive D‐sugars is highly desirable from the viewpoints of organic synthesis and drug discovery. As demonstrated by the convenient preparation of L‐glucosyl, L‐galactosyl, and L‐mannosyl fluorides from readily available β‐D‐ C ‐glucosyl, β‐D‐ C ‐mannosyl, and β‐D‐ C ‐galactosyl derivatives, we describe a novel and efficient approach to the demanding L‐glycosyl fluorides. The transformation features the installation of anomeric hydroxymethyl group under mild conditions and C1‐to‐C5 switch of sugar rings through radical decarboxylative fluorination of uronic acids. The power of this protocol is highlighted by the first assembly of a pentasaccharide repeating unit of Pseudomonas ATCC 31554 extracellular polysaccharide (S‐88). This synthesis relies on the efficient extension of sugar chain at the sterically hindered hydroxy group and the facile introduction of L‐mannosyl unit using L‐mannosyl fluoride as glycosylating agent. The methods developed in this work would provide new tools to the arsenal of synthesis of L‐sugar building blocks and of assembly of glycans containing L‐sugar moieties." @default.
- W4385549706 created "2023-08-04" @default.
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- W4385549706 date "2023-08-22" @default.
- W4385549706 modified "2023-10-18" @default.
- W4385549706 title "Synthesis of L‐Hexopyranosyl Fluorides Enabled by Radical Decarboxylative Fluorination: Assembly of a Pentasaccharide Repeating Unit Corresponding to Extracellular Polysaccharide S‐88" @default.
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- W4385549706 doi "https://doi.org/10.1002/cjoc.202300392" @default.
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