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     <dc:title xml:lang="fr">Vers la synthèse totale du portentol et de la stachybotrine C</dc:title>
     <dcterms:alternative xml:lang="en">Toward the total synthesis of portentol and stachybotrin C</dcterms:alternative>
     <dc:subject xml:lang="fr">portentol</dc:subject><dc:subject xml:lang="fr">polypropionate</dc:subject><dc:subject xml:lang="fr">cyclisation de Prins</dc:subject><dc:subject xml:lang="fr">spirotétrahydropyrane</dc:subject><dc:subject xml:lang="fr">dédoublement cinétique dynamique</dc:subject><dc:subject xml:lang="fr">synthèse totale</dc:subject><dc:subject xml:lang="fr">chimie médicinale</dc:subject><dc:subject xml:lang="fr">stachybotrine C</dc:subject><dc:subject xml:lang="fr">hydroarylation par catalyse à l’or</dc:subject><dc:subject xml:lang="fr">époxydation/cyclisation.</dc:subject>
     <dc:subject xml:lang="en">portentol</dc:subject><dc:subject xml:lang="en">polypropionate</dc:subject><dc:subject xml:lang="en">Prins cyclization</dc:subject><dc:subject xml:lang="en">spirotetrahydropyrane</dc:subject><dc:subject xml:lang="en">dynamic kinetic resolution</dc:subject><dc:subject xml:lang="en">total synthesis</dc:subject><dc:subject xml:lang="en">medicinal chemistry</dc:subject><dc:subject xml:lang="en">stachybotrin C</dc:subject><dc:subject xml:lang="en">gold-catalyzed hydroarylation</dc:subject><dc:subject xml:lang="en">Epoxydation/cyclisation.</dc:subject>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="146989538">Synthèse totale</tef:elementdEntree>
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     <dcterms:abstract xml:lang="fr">Le portentol est un polypropionate qui possède une structure spirocyclique très originale. Cette molécule, dont il n'existe encore aucune synthèse totale, a été isolée du lichen Rocella portentosa à la fin des années 1960. Dans le but d'accéder au squelette du portentol, nous avons développé une méthodologie visant à synthétiser des spirotétrahydropyranes fonctionnalisés via une cyclisation de Prins. Au cours de ce travail, un phénomène de dédoublement cinétique dynamique a aussi été mis en évidence. La stachybotrine C, isolée à partir de la bactérie Stachybotrys parvispora, possède des propriétés neurotrophiques et neuroprotectrices très intéressantes. Deux voies de synthèse ont été envisagées pour préparer ce produit naturel. La première voie repose sur une réaction d'hydroarylation d'un éther propargylique catalysée à l'or, suivie d'une oxydation régiosélective du chromène résultant. La seconde voie fait intervenir une étape clé d'époxydation/cyclisation d'un alkénylphénol obtenu suite à un réarrangement de Claisen. Ces travaux nous ont permis d'accomplir la synthèse totale de la stachybotrine C, de réviser sa structure et de déterminer sa configuration absolue.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">Portentol is a polypropionate with an unusual spirocylic structure. This natural product, which has never been synthesized, has been isolated from the lichen Rocella portentosa. To access the spiranic moiety of the portentol, we have developed a methodology to synthesize spirotetrahydropyranes through a Prins cyclization. Through the study of the scope of this reaction, an usual dynamic kinetic resolution has been highlighted. Stachybotrin C, isolated from the bacteria Stachybotrys parvispora, exhibits interesting neuritogenic and neuroprotective properties. To prepare this natural product, two synthetic routes have been investigated. The first one is based on a gold-catalyzed hydroarylation of a propargyllic ether followed by a regioselective oxidation of the resulting chromene. The second pathway involves as a key step an epoxydation/cyclisation of a phenol prepared via a Claisen rearrangment. We accomplished the synthesis of stachybotrin C, revised its structure and established its absolute configuration.</dcterms:abstract>
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       <tef:nom>Jacolot</tef:nom>
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