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<dc:title xml:lang="fr">Nouvelles classes d’iminosucres bicycliques : approche synthétique des squelettes 5-azaspiro[3.4]octane et 6-azabicyclo[3.2.0]heptane</dc:title>
<dcterms:alternative xml:lang="en">New classes of bicyclic iminosugars : synthetic approach towards 5-azaspiro[3.4]octane and 6-azabicyclo[3.2.0]heptane scaffolds</dcterms:alternative>
<dc:subject xml:lang="fr">5-azaspiro[3.4]octane</dc:subject>
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<dc:subject xml:lang="fr">Aldolisation de type Mukaiyama</dc:subject>
<dc:subject xml:lang="fr">Bicycles accolés</dc:subject>
<dc:subject xml:lang="fr">C-H amination</dc:subject>
<dc:subject xml:lang="fr">Conformation contrainte</dc:subject>
<dc:subject xml:lang="fr">Glycomimétiques</dc:subject>
<dc:subject xml:lang="fr">Iminosucres</dc:subject>
<dc:subject xml:lang="fr">Spirocycles</dc:subject>
<dc:subject xml:lang="en">5-azaspiro[3.4]octane</dc:subject>
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<dc:subject xml:lang="en">Fused bicycles</dc:subject>
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<dcterms:abstract xml:lang="fr">Des études antérieures conduites par notre groupe ont permis d’identifier l’α-1-C-nonyl-1,5-didésoxy-1,5-imino-D-xylitol en tant que puissant inhibiteur de la β-glucocérébrosidase – enzyme impliquée dans la maladie de Gaucher. La conformation inhabituelle (chaise inversée) de ce composé nous a incités à étudier plus avant la relation entre conformation et activité biologique des iminosucres. L’objectif de ces travaux de thèse consistait ainsi en la synthèse d’analogues conformationnellement contraints d’iminosucres. Dans un premier temps, trois spiro-iminosucres basés sur un squelette 5-azaspiro[3.4]octane ont été obtenus via une séquence comportant trois étapes clés : formation du cyclobutane par cyclisation radicalaire, introduction de l’azote par C-H amination et formation de la pyrrolidine par métathèse. Dans un second temps, une séquence a été développée pour la synthèse stéréodivergente d’iminosucres bicycliques accolés basés sur un squelette 6-azabicyclo[3.2.0]heptane via l’enchaînement de deux étapes clés : formation de la structure azabicyclique par aldolisation de type Mukaiyama puis oxydation de la cétone résultante en énone.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Previous studies performed by our group led to the identification of α-1-C-nonyl-1,5-dideoxy-1,5-imino-D-xylitol as a powerful inhibitor of β-glucocerebrosidase, the enzyme involved in Gaucher disease. This compound’s unusual (inverted chair) conformation prompted us to further study the relationship between iminosugars’ conformation and biological activity. The aim of this PhD work was thus the synthesis of conformationally restricted iminosugar analogues. Firstly, three spiro-iminosugars based on a 5-azaspiro[3.4]octane scaffold were synthesized through a sequence including three key steps: cyclobutane formation by way of radical cyclisation, nitrogen introduction by mean of C-H amination and pyrrolidine formation by way ofmetathesis. Secondly, we developed a sequence dedicated to the stereodivergent synthesis of fused bicyclic iminosugars based on a 6-azabicyclo[3.2.0]heptane scaffold through a succession of two key steps: azabicyclic scaffold formation by mean of Mukaiyama aldol reaction followed by ketone to enone oxidation.</dcterms:abstract>
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