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<dc:title xml:lang="fr">Synthèse de nouveaux ligands chiraux à partir de terpènes et applications en transfert d'hydrogène asymétrique</dc:title>
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<dc:subject xml:lang="fr">Ligands chiraux</dc:subject>
<dc:subject xml:lang="fr">Aminooximes</dc:subject>
<dc:subject xml:lang="fr">Transfert d'hydrogène</dc:subject>
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<tef:elementdEntree autoriteExterne="059301007" autoriteSource="Sudoc">Catalyse asymétrique</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="030953685" autoriteSource="Sudoc">Ruthénium</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="050290665" autoriteSource="Sudoc">Amino-alcools</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les terpènes représentent plus de 80% des essences naturelles du Maroc, sont de faible coût et très abondants dans la nature, et existent sous forme optiquement pure. Ces composés, de par leur structure qui se prête facilement à des réactions de fonctionnalisations, comportent un ou plusieurs centres de chiralité qui les placent en première ligne comme précurseurs potentiels de coordinats optiquement actifs. Nous nous sommes intéressés à la synthèse de nouveaux ligands chiraux a partir de terpènes naturels. En particulier, nous avons préparé des aminoalcools, diimino et diaminodiols à partir de d’α-pinène, et des α-aminooximes, leurs éthers ainsi que leurs diamines correspondantes à partir du limonène. Ces nouveaux coordinats chiraux ont ensuite été appliqués en catalyse asymétrique de transfert d’hydrogène sur des cétones aromatiques sur des complexes à base de métaux de transition, en particulier le ruthénium, et en présence de l’isopropanol comme source d’hydrogène. Ces ligands en comparaison avec la littérature s’avèrent performants en termes d’activité et sont à même d’induire une bonne énantiosélectivité (des excès énantiomériques de l’ordre de 80% ont été obtenu sur certains substrats). Une étude plus approfondie du mécanisme réactionnel a été réalisée avec les ligands α-aminooximes, dont ce travail présente la première application en catalyse asymétrique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Terpenes represent more than 80% of natural oils of Morocco, are of moderate cost and very plentiful in nature. These compounds are prone to be readily functionalized, and as their backbone includes one or more chiral centers, they are therefore potential precursors for the synthesis of chiral ligands without separation of the enantiomers. In this work, we have been interested in the synthesis of novel chiral ligands from natural terpenes. In particular, we have prepared amino alcohols, diimino and diaminodiols from α-pinene, and α-aminooximes, their ethers and their corresponding diamines from limonene. These new ligands were applied in asymmetric catalysis of hydrogen transfer of aromatic ketones with complexes based on transition metals, particularly ruthenium, in the presence of isopropanol as hydrogen source. These ligands in comparison with the literature prove to be efficient in terms of activity and are shown to induce medium to good enantioselectivities (enantiomeric excesses up to 80% have been obtained on some substrates). Further study on the reaction mechanism have been carried out specifically with the α-aminooximes ligands, as this work is presenting the first application of this new series of ligands in asymmetric catalysis.</dcterms:abstract>
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<dc:title xml:lang="en">Synthesis of chiral bifunctional ligands based on α-pinene and their use in ruthenium catalyzed asymmetric transfer hydrogenation</dc:title>
<dc:creator>Ibn Elalami Mohammed Samir</dc:creator>
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