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- W2036702348 abstract "C-Glycosides in which the pseudoglycosidic substituent is a methylene group have been advertised as hydrolytically stable mimetics of their parent O-glycosides. While this substitution assures greater stability, the lower polarity and increased conformational flexibility in the intersaccharide linker brought about by this change may compromise biological mimicry. In this regard, C-glycosides, in which the pseudoanomeric methylene is replaced with a difluoromethylene group, are interesting because the CF2 group is more of an isopolar replacement for oxygen than CH2. In addition, the CF2 residue is expected to instill conformational bias into the intersaccharide torsions. Herein is described the synthesis and conformational behavior of the difluoromethylene linked C-glycoside of beta-D-galactopyranosyl-(1<-->1)-alpha-D-mannopyranoside. The synthesis centers on the formation of the galactose residue via an oxocarbenium ion-enol ether cyclization. Conformational analysis, using a combination of molecular mechanics, dynamics, and NMR spectroscopy, suggests that the difluoro-C-glycoside populates the non-exo-Gal/exo-Man conformer to a major extent (ca 50%), with a minor contribution ( approximately 15%) from the exo-Gal/exo-Man conformer that corresponds to the ground sate of the parent O-glycoside." @default.
- W2036702348 created "2016-06-24" @default.
- W2036702348 creator A5022259535 @default.
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- W2036702348 date "2007-09-01" @default.
- W2036702348 modified "2023-10-17" @default.
- W2036702348 title "Synthesis and conformational behavior of the difluoromethylene linked C-glycoside analog of β-galactopyranosyl-(1↔1)-α-mannopyranoside" @default.
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- W2036702348 doi "https://doi.org/10.1016/j.carres.2007.06.012" @default.
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