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<dc:title xml:lang="fr">Synthèse de nouvelles classes de glycomimétiques par fonctionnalisation catalytique stéréocontrolée d'exo-glycals</dc:title>
<dcterms:alternative xml:lang="en">Stereocontrolled synthesis of new glycomimetics by way of transition-metal-catalyzed functionalizations of exo-glycals</dcterms:alternative>
<dc:subject xml:lang="fr">Exo-glycals</dc:subject>
<dc:subject xml:lang="fr">Glycochimie</dc:subject>
<dc:subject xml:lang="fr">Dérivés C-glycosidiques</dc:subject>
<dc:subject xml:lang="fr">Radical</dc:subject>
<dc:subject xml:lang="fr">Transfert d'atome d'hydrogène</dc:subject>
<dc:subject xml:lang="fr">Catalyse au fer</dc:subject>
<dc:subject xml:lang="fr">Glycoconjugués</dc:subject>
<dc:subject xml:lang="fr">Stéréocontrôle</dc:subject>
<dc:subject xml:lang="fr">Esters propargyliques</dc:subject>
<dc:subject xml:lang="fr">Catalyse à l'or</dc:subject>
<dc:subject xml:lang="fr">Glycomimétiques</dc:subject>
<dc:subject xml:lang="en">Exo-glycals</dc:subject>
<dc:subject xml:lang="en">Glychochemistry</dc:subject>
<dc:subject xml:lang="en">C-glycosidic derivatives</dc:subject>
<dc:subject xml:lang="en">Radical</dc:subject>
<dc:subject xml:lang="en">Hydrogen atom transfer</dc:subject>
<dc:subject xml:lang="en">Glycoconjugates</dc:subject>
<dc:subject xml:lang="en">Iron catalysis</dc:subject>
<dc:subject xml:lang="en">Stereocontrol</dc:subject>
<dc:subject xml:lang="en">Propargyl esters</dc:subject>
<dc:subject xml:lang="en">Gold catalysis</dc:subject>
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<dcterms:abstract xml:lang="fr">Les exo-glycals font référence à des dérivés de sucre présentant une double liaison C=C exocyclique, utilisés à l'origine comme plateforme de choix pour la synthèse de dérivés C-glycosidiques connus pour leur résistance métabolique. Dans ces travaux de thèse, deux nouvelles méthodologies visant à exploiter la richesse électronique de l’alcène des exo-glycals ont été développés. Dans une première, un transfert d’atome d’hydrogène catalysé au fer, mène à la formation d’un radical pseudo anomérique tertiaire qui vient réagir avec un dérivé de déhydroalanine chiral, pour former des C,C-glycoamino-acides avec un double stéréocontrôle. Les glycoconjugués obtenus sont connus pour améliorer la stabilité d'un peptide lorsqu'ils y sont incorporés. Dans une seconde méthodologie, la migration 1,2 des esters propargyliques catalysée à l'or, a été repensée pour la construction de C,C-glycosides styrenyl-spirocyclopropane inédits. Les glycomimétiques obtenues constituent des intermédiaires de choix pour l’obtention de dérivés d'aryl glycosides conformationnellement contraints, généralement étudiés pour leurs propriétés antidiabétiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Exo-glycals refer to sugar derivatives presenting an exocyclic C=C double bond, originally developed as platforms to prepare C-glycosidic derivatives, known for their metabolic resistance. In this work, two new methodologies were develop to leverage the electron-rich alkene of exo-glycals. In the first methodology, an iron catalyzed hydrogen atom transfer lead to the formation of a tertiary pseudo anomeric radical that can subsequently react with a chiral dehydroalanine derivative to form C,C-glycoamino-acids with high stereocontrol. The obtained glycoconugates are known to improve the stability of a peptide when incorporated into it. In a second methodology, the established gold-catalyzed 1,2-migration of propargyl esters was reengineered to construct unprecedented C,C-glycosides styrenyl-spirocyclopropane. The obtained glycomimetics stand as peculiar intermediates towards conformationally restricted aryl glycosides derivatives, which are usually studied for their anti-diabetic properties.</dcterms:abstract>
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