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<dc:title xml:lang="en">A new total synthesis of myricanol : the influence of an ene-yne system</dc:title>
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<dc:subject xml:lang="fr">Myricanol</dc:subject>
<dc:subject xml:lang="fr">Diarylheptanoïdes</dc:subject>
<dc:subject xml:lang="fr">Couplage de Suzuki-Miyaura domino</dc:subject>
<dc:subject xml:lang="fr">Anti-Alzheimer</dc:subject>
<dc:subject xml:lang="en">Myricanol</dc:subject>
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<dc:subject xml:lang="en">Suzuki-Miyaura domino coupling</dc:subject>
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<dcterms:abstract xml:lang="fr">L'objectif principal de cette thèse de doctorat est la synthèse totale du myricanol, un composé naturel important aux activités biologiques intéressantes. En particulier, ses remarquables propriétés anti-Alzheimer en font un candidat potentiel pour le traitement de diverses taupathies, car il est capable de réduire les niveaux de protéine Tau qui ont tendance à s'accumuler sous forme phosphorylée dans certaines maladies neurodégénératives.. Actuellement, seules trois synthèses racémiques du (+/-)-myricanol sont rapportées dans la littérature. Tout d'abord, cette thèse vise principalement à explorer les conditions optimales pour rendre la cyclisation moins défavorable en utilisant un séco-précurseur insaturé et donc "rigide" en limitant les variations des degrés de liberté conformationnelles pendant la cyclisation. Deux approches synthétiques ont été explorées au cours de cette thèse, d’une part l'étape de macrocyclisation est réalisée à partir d’un système biarylique fonctionnalisé, d’autre part, l'étape de macrocyclisation est effectuée sur un diarylheptanoïde linéaire.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The main objective of this thesis is the total synthesis of myricanol, a natural compound with significant biological activities. In particular, its remarkable anti-Alzheimer's properties make it a potential drug for the treatment of various tauopathies, as it has the ability to reduce levels of tau protein that tend to pathologically accumulate in phosphorylated forms in certain neurodegenerative diseases. Actually only three synthesis of racemic (+/-) - myricanol have been reported in the literature. Firstly, this thesis aims primarily to investigate the optimal conditions to make cyclization less unfavorable using an unsaturated and thus "rigid" seco-precursor to limit conformational degrees of freedom during cyclization. Two main synthetic approacheshave been explored in the course of this thesis, on one side, the macrocyclization involves the properly functionalized biaryl system, on the other side the macrocyclization is performed on a linear diarylheptanoid.</dcterms:abstract>
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