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<dc:title xml:lang="fr">Contrôle de la chiralité axiale par activation de liaisons C-H : accès à des molécules naturelles et ligands inédits</dc:title>
<dcterms:alternative xml:lang="en">Axial chirality control by means of C-H activation : towards natural molecules and original ligands</dcterms:alternative>
<dc:subject xml:lang="fr">Chiralité axiale</dc:subject>
<dc:subject xml:lang="fr">Atropisomérie</dc:subject>
<dc:subject xml:lang="fr">Atropisomères</dc:subject>
<dc:subject xml:lang="fr">Biaryles</dc:subject>
<dc:subject xml:lang="fr">Sulfoxydes</dc:subject>
<dc:subject xml:lang="fr">Activation C-H</dc:subject>
<dc:subject xml:lang="fr">Palladium</dc:subject>
<dc:subject xml:lang="fr">Steganone</dc:subject>
<dc:subject xml:lang="fr">Ligands</dc:subject>
<dc:subject xml:lang="fr">Hydrogenation asymétrique</dc:subject>
<dc:subject xml:lang="en">Axial chirality</dc:subject>
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<dc:subject xml:lang="en">Sulfoxides</dc:subject>
<dc:subject xml:lang="en">C-H activation</dc:subject>
<dc:subject xml:lang="en">Palladium</dc:subject>
<dc:subject xml:lang="en">Steganone</dc:subject>
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<tef:elementdEntree autoriteExterne="031694527" autoriteSource="Sudoc">Énantiomères</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="050310798" autoriteSource="Sudoc">Liaisons carbone-hydrogène</tef:elementdEntree>
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<tef:vedetteRameauNomCommun>
<tef:elementdEntree autoriteExterne="120294354" autoriteSource="Sudoc">Réactions chimiques régiosélectives</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La chiralité axiale est une propriété importante de composés biologiquements actifs, de matériaux avancés et plus particulièrement de ligands utilisés en catalyse asymétrique. En effet de nombreuses structures biaryliques atropisomériques ont montré un excellent pouvoir d’induction asymétrique. Ainsi le contrôle de l’atropisomérie et le développement de nouvelles méthodes synthétiques permettant la synthèse de composés à chiralité axiale optiquement purs attire l’attention de la communauté scientifique. Au cours de ce travail une nouvelle stratégie vers l’obtention de biaryles à chiralité axiale atropenrichis a été explorée. L’utilisation de sulfoxydes énantiopurs, jouant à la fois le rôle de groupe directeur et d’auxiliaire de chiralité, dans une stratégie de fonctionnalisation de liaisons C-H par catalyse homogène au palladium, a permis l’obtention efficace de nombreux composés biaryliques hautement atropenrichis . Les méthodologies développées ont ensuite été appliquées à la synthèse formelle d’un composé naturel bioactif à chiralité axiale, la (-)-steganone, ainsi qu’à la synthèse de ligands doublement atropisomériques inédits.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Axial chirality is an important property of biologically active compounds, advanced materials and more importantly of ligands used in asymmetric catalysis. Indeed, numerous atropisomeric biaryls have demonstrated an excellent asymmetric induction capacity. Thus, the control of atropisomery and the development of original synthetic methodologies allowing the synthesis and the obtention of optically pure axially chiral compounds is an important goal for the scientific community. In this work, a new strategy for the synthesis of atropenriched axially chiral biaryls was explored. The use of enantiopur sulfoxides playing the role of both, a directing group and a chirality auxiliary, in a palladium catalyzed C-H functionalization, allowed the efficient construction of numerous highly atropenriched biaryl compounds. The developed methodologies were furthermore applied to the formal synthesis of an axially chiral and bioactive compound, (-)-steganone, as well as the synthesis of doubly atropisomeric unprecedented ligands. These ligands displayed an excellent potential for asymmetric induction in homogenous asymmetric hydrogenation.</dcterms:abstract>
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