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<dc:title xml:lang="fr">Catalyseurs d'iridium cyclométallés pour la borylation ortho-dirigée de C–H</dc:title>
<dcterms:alternative xml:lang="en">Cyclometallated iridium catalysts for ortho-directed C–H borylation</dcterms:alternative>
<dc:subject xml:lang="fr">Activation C-H</dc:subject>
<dc:subject xml:lang="fr">Borylation dirigée</dc:subject>
<dc:subject xml:lang="fr">Iridium</dc:subject>
<dc:subject xml:lang="fr">Ligand imine</dc:subject>
<dc:subject xml:lang="fr">Cyclométallation</dc:subject>
<dc:subject xml:lang="fr">Fonctionnalisation tardive</dc:subject>
<dc:subject xml:lang="fr">Criblage à haut débit</dc:subject>
<dc:subject xml:lang="en">C-H activation</dc:subject>
<dc:subject xml:lang="en">Directed borylation</dc:subject>
<dc:subject xml:lang="en">Iridium</dc:subject>
<dc:subject xml:lang="en">Imine ligand</dc:subject>
<dc:subject xml:lang="en">Cyclometallation</dc:subject>
<dc:subject xml:lang="en">Late stage functionalization</dc:subject>
<dc:subject xml:lang="en">High-throughput screening</dc:subject>
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<tef:elementdEntree autoriteExterne="087658186" autoriteSource="Sudoc">Activation (chimie)</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="22925263X" autoriteSource="Sudoc">Borylation</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031215963" autoriteSource="Sudoc">Iridium</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="11839763X" autoriteSource="Sudoc">Criblage pharmacologique</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Au cours des deux dernières décennies, la borylation C–H a continué d'évoluer, passant des premiers exemples de réactions stœchiométriques à la synthèse de blocs de construction à l'échelle du kilogramme.1 Plus récemment, l'accent a été mis sur la borylation dirigée permettant un meilleur contrôle de la régiosélectivité dans des molécules plus complexes (Figure 1B).2,3 Généralement, cela est réalisé par une conception astucieuse du ligand introduisant des groupements chélateurs sur le ligand permettant l'interaction ligand-groupe directeur du matériau de départ (Figure 1A, II). La deuxième approche consiste à concevoir des ligands hétérobidentés qui fonctionnent par la formation d'iridacycles insaturés permettant la coordination du groupe directeur (Figure 1B-III)4-6 Cependant, la comparaison directe entre différents groupes directeurs (GD) est rarement démontrée, ce qui rend difficile la prédiction de la réactivité dans des molécules complexes. Le précurseur métallique le plus utilisé [Ir(COD)OMe]2 est également sensible à l'air et à l'humidité, ce qui complique son utilisation pour le criblage à haut débit. Nous avons cherché à résoudre ces deux problèmes en développant des catalyseurs à base d'iridium hautement sélectifs et stables à l'air. En utilisant ces nouveaux catalyseurs, nous avons criblé une multitude de GD différents et nous avons réussi à fonctionnaliser des molécules complexes de manière prévisible.</dcterms:abstract>
<dcterms:abstract xml:lang="en">C–H borylation has continued to evolve from early examples of stoichiometric reactions to a method employed for building block synthesis on a kilogram scale. However, challenges remain for its wider application. We have developed new bis-cyclometallated iridium complexes exhibiting an improved reactivity and air-stability. These complexes have been used for the ortho-directed C–H borylation of arenes, heterocycles, and acrylamides, achieving average to high yields. By combining these new catalysts with high-throughput screening, we rapidly evaluated the reactivity of different directing groups, enabling predictions for the functionalization of substrates with multiple directing groups. Mechanistic studies revealed the details how these new bis-cyclometallated complexes are activated during the reaction. Subsequently, we investigated ligand free borylation and found a wide range of compatible substrates. We then investigated miniaturization of C-H borylation reactions and successfully conducted them on micromolar scale. By integrating our findings with those from the literature, we designed a screening platform comprising eight different reaction conditions. This platform was used to screen a vast array of small molecules, as well as more complex substrates. The results revealed differences between the catalytic systems and allowed us to successfully functionalize complex molecules. These findings highlight the widespread of ligand-free borylation as well as the limitations of the current state-of-the-art methods.</dcterms:abstract>
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