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- Title
Structural and Computational Analysis of 2‐Halogeno‐Glycosyl Cations in the Presence of a Superacid: An Expansive Platform.
- Authors
Lebedel, Ludivine; Ardá, Ana; Martin, Amélie; Désiré, Jérôme; Mingot, Agnès; Aufiero, Marialuisa; Aiguabella Font, Nuria; Gilmour, Ryan; Jiménez‐Barbero, Jesus; Blériot, Yves; Thibaudeau, Sébastien
- Abstract
An expansive NMR‐based structural analysis of elusive glycosyl cations derived from natural and non‐natural monosaccharides in superacids is disclosed. For the first time, it has been possible to explore the consequence of deoxygenation and halogen substitution at the C2 position in a series of 2‐halogenoglucosyl, galactosyl, and mannosyl donors in the condensed phase. These cationic intermediates were characterized using low‐temperature in situ NMR experiments supported by DFT calculations. The 2‐bromo derivatives display intramolecular stabilization of the glycosyl cations. Introducing a strongly electron‐withdrawing fluorine atom at C2 exerts considerable influence on the oxocarbenium ion reactivity. In a superacid, these oxocarbenium ions are quenched by weakly coordinating SbF6− anions, thereby demonstrating their highly electrophilic character and their propensity to interact with poor nucleophiles.
- Subjects
CATION analysis; SUPERACIDS; CONDENSED matter; ANIONS; IONS
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 39, p13896
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201907001