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<dc:title xml:lang="fr">Cyclisation décarboxylante photocatalytique : vers une stratégie générale de synthèse d'azaspirocycles et de glycomimétiques Inédits</dc:title>
<dcterms:alternative xml:lang="en">Photoredox decarboxylative cyclisation : towards a unified strategy for the synthesis of azaspirocycles and new glycomimetics</dcterms:alternative>
<dc:subject xml:lang="fr">Glycomimétiques</dc:subject>
<dc:subject xml:lang="fr">Azaspirocycles</dc:subject>
<dc:subject xml:lang="fr">Spiro-iminosucres</dc:subject>
<dc:subject xml:lang="fr">Décarboxylation radicalaire</dc:subject>
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<dc:subject xml:lang="en">Radical decarboxylation</dc:subject>
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<dcterms:abstract xml:lang="fr">Les iminosucres représente une des classes de glycomimétiques les plus importante et possède un potentiel thérapeutique certain. Trois d’entre eux ont déjà obtenu des autorisations de mise sur le marché en tant que médicaments. En chimie médicinale, de nombreuses stratégies tendent vers l’incorporation de motifs (hétéro)cycliques originaux ainsi que de motifs conformationnellement contraints. L’objectif de ces travaux de thèse a été de mettre au point une méthode de décarboxylation cyclisante afin de synthétiser des spiro-iminosucres via la formation d’un radical tertiaire. Ce radical généré par catalyse photoredox induite par la lumière visible s’additionne sur un accepteur alcène ou alcyne selon un mode 5-exo-trig/dig intramoléculaire. Cette stratégie a permis d’obtenir divers azaspirocycles inédits. La deuxième étude a consisté à appliquer cette méthode à des substrats polyfonctionnalisés afin d’obtenir des spiro-iminosucres.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Iminosugars are one of the most important class of glycomimetics and possess undoubtedly a therapeutic potential. Among them, three have been commercialised as drugs. In medical chemistry, loads of strategies tend toward the incorporation of novel (hetero)cyclic scaffolds and conformationnally constrained structures. The aim of this PhD thesis was to develop a new method of cyclising decarboxylation in order to synthesise spiro-iminosugars via the formation of a tertiary radicals. These radical generated by photoredox catalysis induced by visible light can be added to alkenes or alkynes acceptors according to an intramolecular 5-exo-trig/dig mode. This strategy allowed us to obtain various new azaspirocycles. The second part of the work consisted to apply this method to polyfunctionnalised substrates in order to synthesise spiro-iminosugars.</dcterms:abstract>
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