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<dc:title xml:lang="fr">Synthèse et réactivité de synthons difluorométhoxylés</dc:title>
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<dc:subject xml:lang="fr">Cétone</dc:subject>
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<dc:subject xml:lang="fr">Chimie du fluor</dc:subject>
<dc:subject xml:lang="fr">Difluorométhoxy</dc:subject>
<dc:subject xml:lang="en">Ketone</dc:subject>
<dc:subject xml:lang="en">Ketenimine</dc:subject>
<dc:subject xml:lang="en">Heterocycle</dc:subject>
<dc:subject xml:lang="en">Fluorine chemistry</dc:subject>
<dc:subject xml:lang="en">Difluoromethoxy</dc:subject>
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<tef:elementdEntree autoriteExterne="029576148" autoriteSource="Sudoc">Composés hétérocycliques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le fluor a démontré sa capacité à modifier les propriétés physico-chimiques et biologiques des molécules par rapport à leurs analogues hydrogénés, expliquant son utilisation fréquente en chimie médicinale et agrochimie. Des groupes fluorés émergents (GFE) sont actuellement à l'étude afin de diversifier la nature des motifs fluorés utilisés. Nous avons donc cherché à développer la synthèse d'une brique polyvalente, à savoir une cétone, permettant l'introduction du motif -OCHF2. Celui-ci possède en effet des propriétés intrinsèques intéressantes, mais souffre d’un manque de méthodes d'introduction efficaces, notamment sur les chaînes alkyles. La synthèse de la cétone difluorométhoxylée a d'abord été optimisée. Son potentiel synthétique a ensuite été mis à profit pour l’accès à des composés tels que des amidines, des imidates et des thioimidates via une céténimine comme espèce réactive. La cétone a ensuite démontré son utilité pour accéder à des hétérocycles difluorométhoxylés encore rarement rencontrés, d'abord via un intermédiaire énaminone, et finalement directement par une cyclisation de type Fischer.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Fluorine has demonstrated its ability to modify the physico-chemical and biological properties of molecules compared to their hydrogenated analogues, explaining its widespread use in medicinal- as well as agrochemistry. So-called Emerging Fluorinated Groups (EFG) are currently under investigation, in order to diversify the nature of the used fluorinated moieties. Therefore, we aimed to develop the synthesis of a versatile building block, namely a ketone, allowing the introduction of the OCHF2 motif. As a matter of fact, the latter possesses some interesting inherent properties, but suffers a lack of efficient introduction methods, especially on alkyl chains. First the synthesis of the difluoromethoxylated ketone was optimized. Its synthetic potential was then exploited, as it was used to access compounds such as amidines, imidates and thioimidates via a ketenimine as highly reactive specie. Subsequently, the ketone demonstrated its usefulness in accessing very rarely encountered difluoromethoxylated heterocycles, first via an enaminone intermediate, and finally directly through a Fischer-type cyclization.</dcterms:abstract>
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