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<dc:title xml:lang="fr">Etude des pyridines en tant qu'aza-diènes en réactions de cycloaddition intramoléculaire de Diels-Alder à demande électronique inverse</dc:title>
<dcterms:alternative xml:lang="en">Study of pyridines as aza-dienes in intramolecular in inverse electron demand Diels-Alder cycloaddition reactions</dcterms:alternative>
<dc:subject xml:lang="fr">Cycloaddition</dc:subject>
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<dc:subject xml:lang="fr">Pyridine</dc:subject>
<dc:subject xml:lang="fr">Indazole</dc:subject>
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<dcterms:abstract xml:lang="fr">Les azines hétéroaromatiques ont été largement utilisées dans les réactions de Diels–Alder à demande inverse d'électrons pour la synthèse d'hétérocycles et pour des applications en chimie biorthogonale. Parmi les azadiènes, les tétrazines et les triazines se sont révélées très réactives. A l’inverse, l'utilisation de pyridines dans les réactions de Diels-Alder est rare en raison de leur stabilisation aromatique inhérente et de leur faible réactivité. Des conditions de réaction relativement drastiques sont nécessaires pour les faire réagir avec des alcènes ou des alcynes. Pour remédier à ce manque de réactivité, nous proposons ici une solution donnant un accès rapide aux dérivés de type indazole. La transformation présente un champ d’application intéressant, en conditions douces et avec de bons à excellents rendements. Cette méthodologie ouvre de nouvelles voies dans l'utilisation des pyridines comme diènes dans les réactions IEDDA pour synthétiser divers squelettes hétérocycliques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Heteroaromatic azines have been widely used in reverse electron-demand Diels-Alder reactions for the synthesis of heterocycles and for applications in biorthogonal chemistry. Among the azadienes, tetrazines and triazines have been shown to be very reactive in cycloaddition reactions. Conversely, the use of pyridines in Diels-Alder reactions is rare due to their inherent aromatic stabilisation and low reactivity. Relatively drastic reaction conditions are required to react them in Diels-Alder cycloadditions with alkenes or alkynes. To remedy this lack of reactivity, we propose here a solution giving rapid access to indazole derivatives. The transformation presents an interesting field of application, under mild conditions and with good to excellent yields. This methodology open new avenues in the use of pyridines as dienes in IEDDA reactions to synthesize various heterocyclic skeletons.</dcterms:abstract>
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