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<dc:title xml:lang="fr">Accès vers des composés trifluorométhoxylés énantioenrichis</dc:title>
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<dc:subject xml:lang="fr">Chimie du fluor</dc:subject>
<dc:subject xml:lang="fr">Synthèse asymétrique</dc:subject>
<dc:subject xml:lang="fr">Trifluorométhoxylation</dc:subject>
<dc:subject xml:lang="fr">Sulfoxydes</dc:subject>
<dc:subject xml:lang="fr">Oxydation organocatalysée</dc:subject>
<dc:subject xml:lang="fr">Etude mécanistique</dc:subject>
<dc:subject xml:lang="en">Fluorine chemistry</dc:subject>
<dc:subject xml:lang="en">Asymmetric synthesis</dc:subject>
<dc:subject xml:lang="en">Trifluoromethoxylation</dc:subject>
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<dc:subject xml:lang="en">Organocatalyzed oxidation</dc:subject>
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<tef:elementdEntree autoriteExterne="032575033" autoriteSource="Sudoc">Synthèse asymétrique</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’introduction d’atomes de fluor sur une molécule permet d’influer sur ses propriétés, e.g. sa lipophilie, sa stabilité métabolique, son pKa, et sa conformation. Notre intérêt s’est porté sur le motif –OCF3. Il possède les propriétés particulières d’être très lipophile, de modifier la conformation des cycles aromatiques qui le portent via une hyperconjugaison négative et présente l’avantage d’être stable thermiquement et chimiquement. Aussi attractif qu’il soit, il n’existe pas de méthode générale d’introduction du groupe –OCF3. Pour les chaînes alkyles, les méthodes sont rares, sensibles et coûteuses. Nous avons développé deux méthodes pour accéder à des sulfoxydes trifluorométhoxylés énantioenrichis où le motif –OCF3 est porté par un carbone sp3. Une réaction de type Pummerer sans métal dans des conditions douces permet d’obtenir des thioéthers trifluorométhoxylés, qui sont ensuite oxydés pour donner les sulfoxydes correspondants racémiques ou énantiomériquement purs avec d’excellents rendements. Le mécanisme de la réaction de Pummerer a été élucidé. Les sulfoxydes trifluorométhoxylés obtenus ont été fonctionnalisés avec des électrophiles.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Introducing fluorine atoms into a molecule can modulate its properties, including lipophilicity, metabolic stability, pKa and conformation. We focused on the –OCF3 moiety. It presents specific properties of being highly lipophilic, of modifying the conformation of (trifluoromethoxy)arenes via negative hyperconjugation and has the advantage of being thermally and chemically stable. Attractive as it is, there is no general method to introduce the –OCF3 group. For alkyl chains, methods are scarce, sensitive and costly. We have developed two methods to access enantioenriched trifluoromethoxylated sulfoxides where the –OCF3 moiety is carried by an sp3 carbon. A metal-free Pummerer-type reaction under mild conditions yields trifluoromethoxylated thioethers, oxidized to give the corresponding sulfoxides in racemic or nearly enantiomerically pure form with excellent yields. The mechanism of the Pummerer reaction has been solved. The trifluoromethoxylated sulfoxides obtained have been functionalized with several electrophiles.</dcterms:abstract>
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