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<dc:title xml:lang="fr">Synthèse d'indazoles et de carbazoles via la réaction de Diels-Alder à demande électronique inverse des yne-pyridines</dc:title>
<dcterms:alternative xml:lang="en">Synthesis of indazoles and carbazoles via intramolecular inverse electron demand Diels−Alder reaction of yne-pyridines</dcterms:alternative>
<dc:subject xml:lang="fr">IEEDDA (Diels-Alder à demande électronique inverse)</dc:subject>
<dc:subject xml:lang="fr">Pyridines</dc:subject>
<dc:subject xml:lang="fr">Insazoles</dc:subject>
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<dc:subject xml:lang="en">IEEDDA (Inverse electron-demand Diels-Alder)</dc:subject>
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<tef:elementdEntree autoriteExterne="031686354" autoriteSource="Sudoc">Réaction de Diels-Alder</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les cycloadditions Diels-Alder à demande inverse d'électrons des azadiènes sont une méthode efficace pour l'élaboration rapide d'hétérocycles complexes contenant de l'azote, qui sont des fragments clés que l'on trouve souvent dans les médicaments et les produits naturels. Dans les travaux précédents de notre groupe, il a été démontré que les 2-hydrazonylpyrimidines pouvaient être exceptionnellement activées par trifluoroacétylation et réaliser la cycloaddition de Diels-Alder dans des conditions de réaction très douces, fournissant une grande diversité d'aza-indazoles. Parmi les azadiènes, les pyridines sont connues comme des partenaires réactifs très médiocres dans les réactions de Diels-Alder, leur stabilisation aromatique inhérente nécessite généralement des conditions d'activation difficiles pour augmenter la réactivité de la pyridine. Par conséquent, les cycloadditions avec des pyridines constituent sans aucun doute un défi important. Dans ce travail, nous rapportons nos efforts sur l'activation des pyridines vers la réaction de Diels-Alder à demande électronique inverse intramoléculaire pour donner accès à des indazoles et carbazoles diversifiés.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Inverse electron-demand Diels-Alder cycloadditions of azadienes is an efficient method for the rapid elaboration of complex nitrogen containing heterocycles, which are key fragments that are often found in drugs and natural products. In the previous work of our group, it was demonstrated that 2-hydrazonylpyrimidines could be exceptionally activated by trifluoroacetylation and realize Diels−Alder cycloaddition under very mild reaction conditions, providing a large diversity of aza-indazoles. Among azadienes, pyridines are known as very poor reactive partners in Diels-Alder reactions, their inherent aromatic stabilization usually requires harsh activation conditions for increasing pyridine reactivity. Therefore cycloadditions with pyridines is undoubtedly a significant challenge. In this work we report our efforts on the activation of pyridines towards intramolecular inverse electron-demand Diels–Alder reaction to give access to diversified indazoles and carbazole.</dcterms:abstract>
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