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<dc:title xml:lang="fr">Développement de nouvelles méthodes d'insertion du groupement trifluorométhyléther</dc:title>
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<dc:subject xml:lang="fr">Chimie du fluor</dc:subject>
<dc:subject xml:lang="fr">Groupes fluorés émergents</dc:subject>
<dc:subject xml:lang="fr">Sulfoxydes</dc:subject>
<dc:subject xml:lang="fr">Réaction de Pummerer</dc:subject>
<dc:subject xml:lang="en">Fluorine chemistry</dc:subject>
<dc:subject xml:lang="en">Emerging fluorinated groups</dc:subject>
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<dcterms:abstract xml:lang="fr">Une réaction de trifluorométhoxylation de type réaction de Pummerer a été développée pour pallier au manque de méthodes simples et stéréosélectives d’insertion du groupe trifluorométhyléther. Celle-ci permet la génération du trifluorométhanolate lors de l’activation d’un sulfoxyde par un arylsulfonate de trifluorométhyle. L’oxydation des thioéthers alors obtenus mène aux sulfoxydes α-trifluorométhoxylés correspondants. Plusieurs sulfoxydes ont ainsi été synthétisés dont un de manière énantiopure. La fonctionnalisation des sulfoxydes racémiques a ensuite été abordée et a mené à la mise au point d’une méthode permettant leur méthylation. Un sulfoxyde α-trifluorométhoxylé α-méthylé diastéréopur a ainsi été préparé. L’insertion de motifs plus complexes ainsi qu’une seconde fonctionnalisation et l’emploi de sulfoxydes α-trifluorométhoxylés énantiopurs pourrait mener par la suite à des composés de configuration contrôlée dont le motif OCF3 est porté par un carbone quaternaire. Parallèlement, une seconde méthode de trifluorométhoxylation a été développée suite au constat que la plupart des procédés actuels nécessitent l’emploi de réactifs dédiés souvent toxiques, onéreux ou peu pratiques. Cette méthode, ne faisant pas appel à de tels réactifs, repose sur la génération in situ de fluorophosgène à partir de triphosgène puis de l’anion trifluorométhanolate par réaction du fluorophosgene avec un ion fluorure. Plusieurs iodures d’alkyles ont ainsi pu être trifluorométhoxylés.</dcterms:abstract>
<dcterms:abstract xml:lang="en">A Pummerer type trifluoromethoxylation reaction, where trifluoromethanolate is generated by activation of a sulfoxyde by a trifluoromethyl arylsulfonate, has been developed to fill the gap of easy and stereoselective trifluoromethoxylation methods. The sulfides obtained have been then oxidized to afford the corresponding α-trifluoromethoxylated sulfoxides. Several of these compounds have been prepared including one in an enantiomerically pure form. The functionalization of a racemic trifluoromethoxylated sulfoxide has then been studied leading to a methylation procedure. Further investigation about more complex functionalizations, a second functionalization and functionalization of enantiomerically pure sulfoxides could be realized to afford structures of controlled configuration with a trifluoromethoxylated quaternary carbon. In the meantime, while most of the actual processes require specially designed reagents, a second trifluoromethoxylation reaction has been developed in which the generation of fluorophosgene from triphosgene leads to trifluoromethoxide after reaction with a fluoride ion. Several alkyl iodides have been trifluoromethoxylated using this method.</dcterms:abstract>
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