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- W3157810025 abstract "Liquid SO 2 is a polar solvent that dissolves both covalent and ionic compounds. Sulfur dioxide possesses also Lewis acid properties, including the ability to covalently bind Lewis basic fluoride ions in a relatively stable fluorosulfite anion (FSO 2 − ). Herein we report the application of liquid SO 2 as a promoting solvent for glycosylation with glycosyl fluorides without any external additive. By using various temperature regimes, the method is applied for both armed and disarmed glucose and mannose-derived glycosyl fluorides in moderate to excellent yields. A series of pivaloyl-protected O - and S -mannosides, as well as one example of a C -mannoside, are synthesized to demonstrate the scope of the glycosyl acceptors. The formation of the fluorosulfite species during the glycosylation with glycosyl fluorides in liquid SO 2 is proved by 19 F NMR spectroscopy. A sulfur dioxide-assisted glycosylation mechanism that proceeds via solvent separated ion pairs is proposed, whereas the observed α,β-selectivity is substrate-controlled and depends on the thermodynamic equilibrium." @default.
- W3157810025 created "2021-05-10" @default.
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- W3157810025 date "2021-04-29" @default.
- W3157810025 modified "2023-10-17" @default.
- W3157810025 title "Metal-free glycosylation with glycosyl fluorides in liquid SO<sub>2</sub>" @default.
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- W3157810025 doi "https://doi.org/10.3762/bjoc.17.78" @default.
- W3157810025 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8093551" @default.
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- W3157810025 hasPublicationYear "2021" @default.
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