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<dc:title xml:lang="fr">Or et azacycles : vers la synthèse totale de molécules naturelles</dc:title>
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<dc:subject xml:lang="fr">Catalyse homogène</dc:subject>
<dc:subject xml:lang="fr">Or</dc:subject>
<dc:subject xml:lang="fr">Synthèse totale</dc:subject>
<dc:subject xml:lang="fr">Hétérocycles</dc:subject>
<dc:subject xml:lang="fr">Azétidines</dc:subject>
<dc:subject xml:lang="fr">Harmalidine</dc:subject>
<dc:subject xml:lang="fr">Migration de sulfonyle</dc:subject>
<dc:subject xml:lang="fr">Pyrrolizidines</dc:subject>
<dc:subject xml:lang="fr">Indolizidines</dc:subject>
<dc:subject xml:lang="fr">Azépines</dc:subject>
<dc:subject xml:lang="en">Homogeneous catalysis</dc:subject>
<dc:subject xml:lang="en">Gold</dc:subject>
<dc:subject xml:lang="en">Total synthesis</dc:subject>
<dc:subject xml:lang="en">Heterocycles</dc:subject>
<dc:subject xml:lang="en">Pyrroloindoles</dc:subject>
<dc:subject xml:lang="en">Harmalidine</dc:subject>
<dc:subject xml:lang="en">Sulfonyl migration</dc:subject>
<dc:subject xml:lang="en">Pyrrolizidines</dc:subject>
<dc:subject xml:lang="en">Indolizidines</dc:subject>
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<tef:elementdEntree autoriteExterne="027993884" autoriteSource="Sudoc">Catalyse homogène</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="146989538" autoriteSource="Sudoc">Synthèse totale</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La Nature est une source quasi inépuisable de molécules possédant des propriétés biologiques souvent remarquables. Ainsi, les plantes fournissent chaque jour de nouvelles structures dont les chimistes s’inspirent afin de créer de façon synthétique des molécules similaires ou dérivées pouvant avoir de potentielles applications en tant qu’agents thérapeutiques par exemple.L’émergence de la catalyse organométallique a permis d’améliorer considérablement les méthodes de synthèse de molécules complexes. La catalyse homogène à l’or, dont le potentiel n’a été exploité qu’à partir des années 2000, a prouvé son efficacité pour effectuer de nombreuses réactions permettant de créer plusieurs liaisons carbone-carbone ou carbone-hétéroatome en une étape. Les conditions douces et la grande tolérance des catalyseurs d’or vis-à-vis de groupements fonctionnels divers ont naturellement mené à l’application de la catalyse à l’or à la synthèse de produits naturels. Ces études s’inscrivent dans cette dynamique et exploitent la réactivité d’azacycles contraints et d’alcynes en présence d’or(I) pour former des squelettes hétérocycliques couramment rencontrés au sein de produits naturels. La réactivité particulière des groupements sulfonyles protecteurs de l’azote a également été étudiée pour synthétiser différentes molécules azabicycliques. Les méthodes de synthèse mises au point ont finalement été appliquées à la synthèse de molécules cibles.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Nature is a nearly endless source of molecules, often possessing remarkable biological properties. Thus, plants provide new structures every day, inspiring chemists to synthetically create similar molecules or analogs, which are potential therapeutic agents for example. The emergence of organometallic chemistry allowed for considerable improvement of synthetic methods to make complex molecular scaffolds. Homogeneous gold catalysis, whose potential has only been explored starting from 2000, proved its efficiency to make numerous reactions. Most of them can generate several carbon-carbon or carbon-heteroatom bonds in one step. Soft conditions as well as good tolerance of gold catalysts toward multiple functional groups naturally led to the application of gold-catalyzed steps in various total syntheses of natural products.The present study evolves in this context and explores the reactivity of strained azacycles and alkynes in the presence of gold(I) to form heterocyclic skeletons that are commonly found in natural products. The specific reactivity of sulfonyl nitrogen-protecting groups has also been studied to synthesize azabicyclic compounds. The application of those various new methodologies to the synthesis of target molecules has finally been studied.</dcterms:abstract>
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