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<dc:title xml:lang="fr">Réactivité d'azacycles en catalyse à l'or</dc:title>
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<dc:subject xml:lang="fr">Hétérocycles acétyléniques</dc:subject>
<dc:subject xml:lang="fr">Aziridines</dc:subject>
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<dc:subject xml:lang="fr">Spirocycles</dc:subject>
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<dc:subject xml:lang="en">Homogenous catalysis</dc:subject>
<dc:subject xml:lang="en">Gold complexes</dc:subject>
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<dc:subject xml:lang="en">Aziridines</dc:subject>
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<dcterms:abstract xml:lang="fr">La catalyse organométallique est l'un des piliers de la synthèse chimique moderne. Elle permet notamment la formation rapide de liaisons carbone-carbone et carbone-hétéroatome, processus les plus importants pour la fabrication des milliers de composés nécessaires à la vie contemporaine. Elle répond également aux critères d'économie d'atomes et d'énergie, et de réduction des déchets, des risques et des coûts de mise en oeuvre d'une réaction chimique.Parmi les thématiques les plus récentes de la synthèse organique, la catalyse homogène à l'or s'est imposée en seulement quelques années comme un outil synthétique très puissant. Elle autorise la génération rapide de complexité moléculaire à partir de substrats simples par l'activation d'insaturations carbonées. Durant ces études, nous avons tenté de tirer profit du caractère carbophile des complexes d'or (1) et (Ill) mais aussi de leur affinité pour certaines fonctions polaires pour transformer des hétérocycles acétyléniques en composés hétéropolycycliques dans des réactions en cascade. La réactivité complémentaire des complexes d'argent (1) a également été exploitée, ces derniers présentant de surcroît une sélectivité remarquable pour la déprotection d'éthers de méthoxybenzyle.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Organometallic catalysis is a key tool of modern chemical synthesis. lts use is ubiquitous in the preparation of bulk or fine chemicals, in particular for the assembly of carbon-carbon and carbon-heteroatom bonds. Besides its overall efficiency, it responds to the responsible criteria of energy and atom economy, the reduction of waste, risk, and financial costs needed to perform a chemical reaction.ln just a few years, homogenous gold catalysis has emerged as an invaluable tool for the fast generation of molecular complexity. lndeed, it allows the strong electrophilic activation of unsaturated hydrocarbon moieties (e.g. alkynes or alienes). During this PhD thesis, we focused our studies on the use of gold's pi acidity as weil as its "classical" - but less discussed - Lewis acid character for the triggering of cascade reactions.Starting from acetylenic heterocycles, we targeted the synthesis of polycyclic compounds. The milder reactivity of silver complexes was also found useful in these reactions, as weil as in the deprotection of methoxybenzyl ethers.</dcterms:abstract>
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