4 research outputs found

    Réaction de trifluorométhylthiolation électrophile et synthÚse de radioligands en imagerie médicale TEP pour la protéine α-synucléine

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    Part 1 : More and more applications for fluorinated molecules are being found in various fields, from materials to life sciences. In recent years, a growing interest has emerged in the association of the trifluoromethyl group with heteroatoms such as CF3O or CF3S. The CF3S moiety is of particular interest, because of its high hydrophobicity parameter (π=1.44). Consequently compounds bearing this group are important targets for various applications, in particular in medicinal chemistry and agrochemistry. However, the majority of previous methods described in the literature use toxic reagents under harsh conditions. Trifluoromethanesulfenamides (1st and 2nd generation) have demonstrated their potential in the electrophilic trifluoromethylthiolations. Because of their interesting reactivity, these two generations of shelf-stable reagents are now in the toolbox of organic chemists for the trifluoromethylthiolation of molecules, providing a convenient method to pursue less toxic pathways. Part 2 : α-synuclein aggregation is a neuropathological hallmark of many neurodegenerative diseases including Parkinson’s disease (PD) and dementia with Lewy bodies (DLB), collectively termed synucleinopathies. PET imaging can reflect the amount and distribution of alpha-synuclein aggregates in the brain and would be advantageous to use for specific diagnosis of synucleinopathies in presymptomatic stages of disease. We focused our interest onto benzimidazole derivatives as small, planar and -delocalized compounds to design radiotracers of synuclein aggregates. Compounds based on the association of benzimidazole moiety, rigid linker (alkyne and triazole) and another aromatic part have been designed. The radiolabeling could be performed by nucleophilic substitution with K18F during the last step. With this convergent strategy, we could have acces to a large series of molecules to be evaluatedPartie 1 : De plus en plus de molĂ©cules fluorĂ©es sont utilisĂ©es dans bon nombre de domaines variĂ©s, allant des matĂ©riaux aux sciences de la vie. Ces derniĂšres annĂ©es, un intĂ©rĂȘt croissant a Ă©mergĂ© avec l'association du groupement CF3 avec un hĂ©tĂ©roatome, comme OCF3 ou SCF3. Le groupement SCF3 est trĂšs intĂ©ressant Ă  cause de son paramĂštre d'hydrophobie (π=1.44). Par consĂ©quent, les composĂ©s portant ce groupement sont des cibles importantes pour de nombreuses applications, en particulier en chimie mĂ©dicinale. Cependant, la majoritĂ© des prĂ©cĂ©dentes mĂ©thodes dĂ©crites dans la littĂ©rature utilisent des rĂ©actifs toxiques dans des conditions drastiques. Les trifluoromĂ©thanesulfĂ©namides (1Ăšre et 2nde gĂ©nĂ©ration) ont dĂ©montrĂ© leur potentiel dans la trifluoromĂ©thylthiolation Ă©lectrophile. En raison de leur rĂ©activitĂ© intĂ©ressante, ces deux gĂ©nĂ©rations de rĂ©actifs stables sont maintenant dans la boĂźte Ă  outils de la chimie organique pour la trifluoromĂ©thylthiolation de molĂ©cules. Partie 2 : Des aggrĂ©gats d'α-synuclĂ©ine sont une caractĂ©ristique neuropathologique de nombreuses maladies neurodĂ©gĂ©nĂ©ratives, notamment la maladie de Parkinson (MP) et la dĂ©mence Ă  corps de Lewy (DLB), collectivement appelĂ©s synuclĂ©inopathies. L'imagerie TEP pourrait rĂ©vĂ©ler la quantitĂ© et la distribution des agrĂ©gats d'α-synuclĂ©ine dans le cerveau et serait plus avantageuse Ă  utiliser pour le diagnostic spĂ©cifique de synuclĂ©inopathies prĂ©symptomatiques Ă  diffĂ©rents stades de lamaladie. Nous avons concentrĂ© nos efforts sur des dĂ©rivĂ©s de benzimidazole comme composĂ©s de petites tailles, plans et π-dĂ©localisĂ©s pour concevoir des traceurs radioactifs des agrĂ©gats de la synuclĂ©ine. Ainsi des structures assemblant des benzimidazoles, un espaceur rigide (alcyne et triazole) et enfin une autre partie aromatique ont Ă©tĂ© envisagĂ©es. Le radiomarquage pourra ĂȘtre effectuĂ© par une substitution nuclĂ©ophile avec K18F au cours de la derniĂšre Ă©tape. Avec cette stratĂ©gie convergente, nous pourrions avoir accĂšs Ă  une grande sĂ©rie de molĂ©cules Ă  Ă©value

    Electrophilic trifluoromethylthiolation reaction and synthesis of radioligand for medicinal imaging of l’α-synuclein

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    Partie 1 : De plus en plus de molĂ©cules fluorĂ©es sont utilisĂ©es dans bon nombre de domaines variĂ©s, allant des matĂ©riaux aux sciences de la vie. Ces derniĂšres annĂ©es, un intĂ©rĂȘt croissant a Ă©mergĂ© avec l'association du groupement CF3 avec un hĂ©tĂ©roatome, comme OCF3 ou SCF3. Le groupement SCF3 est trĂšs intĂ©ressant Ă  cause de son paramĂštre d'hydrophobie (π=1.44). Par consĂ©quent, les composĂ©s portant ce groupement sont des cibles importantes pour de nombreuses applications, en particulier en chimie mĂ©dicinale. Cependant, la majoritĂ© des prĂ©cĂ©dentes mĂ©thodes dĂ©crites dans la littĂ©rature utilisent des rĂ©actifs toxiques dans des conditions drastiques. Les trifluoromĂ©thanesulfĂ©namides (1Ăšre et 2nde gĂ©nĂ©ration) ont dĂ©montrĂ© leur potentiel dans la trifluoromĂ©thylthiolation Ă©lectrophile. En raison de leur rĂ©activitĂ© intĂ©ressante, ces deux gĂ©nĂ©rations de rĂ©actifs stables sont maintenant dans la boĂźte Ă  outils de la chimie organique pour la trifluoromĂ©thylthiolation de molĂ©cules. Partie 2 : Des aggrĂ©gats d'α-synuclĂ©ine sont une caractĂ©ristique neuropathologique de nombreuses maladies neurodĂ©gĂ©nĂ©ratives, notamment la maladie de Parkinson (MP) et la dĂ©mence Ă  corps de Lewy (DLB), collectivement appelĂ©s synuclĂ©inopathies. L'imagerie TEP pourrait rĂ©vĂ©ler la quantitĂ© et la distribution des agrĂ©gats d'α-synuclĂ©ine dans le cerveau et serait plus avantageuse Ă  utiliser pour le diagnostic spĂ©cifique de synuclĂ©inopathies prĂ©symptomatiques Ă  diffĂ©rents stades de lamaladie. Nous avons concentrĂ© nos efforts sur des dĂ©rivĂ©s de benzimidazole comme composĂ©s de petites tailles, plans et π-dĂ©localisĂ©s pour concevoir des traceurs radioactifs des agrĂ©gats de la synuclĂ©ine. Ainsi des structures assemblant des benzimidazoles, un espaceur rigide (alcyne et triazole) et enfin une autre partie aromatique ont Ă©tĂ© envisagĂ©es. Le radiomarquage pourra ĂȘtre effectuĂ© par une substitution nuclĂ©ophile avec K18F au cours de la derniĂšre Ă©tape. Avec cette stratĂ©gie convergente, nous pourrions avoir accĂšs Ă  une grande sĂ©rie de molĂ©cules Ă  Ă©valuerPart 1 : More and more applications for fluorinated molecules are being found in various fields, from materials to life sciences. In recent years, a growing interest has emerged in the association of the trifluoromethyl group with heteroatoms such as CF3O or CF3S. The CF3S moiety is of particular interest, because of its high hydrophobicity parameter (π=1.44). Consequently compounds bearing this group are important targets for various applications, in particular in medicinal chemistry and agrochemistry. However, the majority of previous methods described in the literature use toxic reagents under harsh conditions. Trifluoromethanesulfenamides (1st and 2nd generation) have demonstrated their potential in the electrophilic trifluoromethylthiolations. Because of their interesting reactivity, these two generations of shelf-stable reagents are now in the toolbox of organic chemists for the trifluoromethylthiolation of molecules, providing a convenient method to pursue less toxic pathways. Part 2 : α-synuclein aggregation is a neuropathological hallmark of many neurodegenerative diseases including Parkinson’s disease (PD) and dementia with Lewy bodies (DLB), collectively termed synucleinopathies. PET imaging can reflect the amount and distribution of alpha-synuclein aggregates in the brain and would be advantageous to use for specific diagnosis of synucleinopathies in presymptomatic stages of disease. We focused our interest onto benzimidazole derivatives as small, planar and -delocalized compounds to design radiotracers of synuclein aggregates. Compounds based on the association of benzimidazole moiety, rigid linker (alkyne and triazole) and another aromatic part have been designed. The radiolabeling could be performed by nucleophilic substitution with K18F during the last step. With this convergent strategy, we could have acces to a large series of molecules to be evaluate

    Réaction de trifluorométhylthiolation électrophile et synthÚse de radioligands en imagerie médicale TEP pour la protéine α-synucléine

    No full text
    Part 1 : More and more applications for fluorinated molecules are being found in various fields, from materials to life sciences. In recent years, a growing interest has emerged in the association of the trifluoromethyl group with heteroatoms such as CF3O or CF3S. The CF3S moiety is of particular interest, because of its high hydrophobicity parameter (π=1.44). Consequently compounds bearing this group are important targets for various applications, in particular in medicinal chemistry and agrochemistry. However, the majority of previous methods described in the literature use toxic reagents under harsh conditions. Trifluoromethanesulfenamides (1st and 2nd generation) have demonstrated their potential in the electrophilic trifluoromethylthiolations. Because of their interesting reactivity, these two generations of shelf-stable reagents are now in the toolbox of organic chemists for the trifluoromethylthiolation of molecules, providing a convenient method to pursue less toxic pathways. Part 2 : α-synuclein aggregation is a neuropathological hallmark of many neurodegenerative diseases including Parkinson’s disease (PD) and dementia with Lewy bodies (DLB), collectively termed synucleinopathies. PET imaging can reflect the amount and distribution of alpha-synuclein aggregates in the brain and would be advantageous to use for specific diagnosis of synucleinopathies in presymptomatic stages of disease. We focused our interest onto benzimidazole derivatives as small, planar and -delocalized compounds to design radiotracers of synuclein aggregates. Compounds based on the association of benzimidazole moiety, rigid linker (alkyne and triazole) and another aromatic part have been designed. The radiolabeling could be performed by nucleophilic substitution with K18F during the last step. With this convergent strategy, we could have acces to a large series of molecules to be evaluatedPartie 1 : De plus en plus de molĂ©cules fluorĂ©es sont utilisĂ©es dans bon nombre de domaines variĂ©s, allant des matĂ©riaux aux sciences de la vie. Ces derniĂšres annĂ©es, un intĂ©rĂȘt croissant a Ă©mergĂ© avec l'association du groupement CF3 avec un hĂ©tĂ©roatome, comme OCF3 ou SCF3. Le groupement SCF3 est trĂšs intĂ©ressant Ă  cause de son paramĂštre d'hydrophobie (π=1.44). Par consĂ©quent, les composĂ©s portant ce groupement sont des cibles importantes pour de nombreuses applications, en particulier en chimie mĂ©dicinale. Cependant, la majoritĂ© des prĂ©cĂ©dentes mĂ©thodes dĂ©crites dans la littĂ©rature utilisent des rĂ©actifs toxiques dans des conditions drastiques. Les trifluoromĂ©thanesulfĂ©namides (1Ăšre et 2nde gĂ©nĂ©ration) ont dĂ©montrĂ© leur potentiel dans la trifluoromĂ©thylthiolation Ă©lectrophile. En raison de leur rĂ©activitĂ© intĂ©ressante, ces deux gĂ©nĂ©rations de rĂ©actifs stables sont maintenant dans la boĂźte Ă  outils de la chimie organique pour la trifluoromĂ©thylthiolation de molĂ©cules. Partie 2 : Des aggrĂ©gats d'α-synuclĂ©ine sont une caractĂ©ristique neuropathologique de nombreuses maladies neurodĂ©gĂ©nĂ©ratives, notamment la maladie de Parkinson (MP) et la dĂ©mence Ă  corps de Lewy (DLB), collectivement appelĂ©s synuclĂ©inopathies. L'imagerie TEP pourrait rĂ©vĂ©ler la quantitĂ© et la distribution des agrĂ©gats d'α-synuclĂ©ine dans le cerveau et serait plus avantageuse Ă  utiliser pour le diagnostic spĂ©cifique de synuclĂ©inopathies prĂ©symptomatiques Ă  diffĂ©rents stades de lamaladie. Nous avons concentrĂ© nos efforts sur des dĂ©rivĂ©s de benzimidazole comme composĂ©s de petites tailles, plans et π-dĂ©localisĂ©s pour concevoir des traceurs radioactifs des agrĂ©gats de la synuclĂ©ine. Ainsi des structures assemblant des benzimidazoles, un espaceur rigide (alcyne et triazole) et enfin une autre partie aromatique ont Ă©tĂ© envisagĂ©es. Le radiomarquage pourra ĂȘtre effectuĂ© par une substitution nuclĂ©ophile avec K18F au cours de la derniĂšre Ă©tape. Avec cette stratĂ©gie convergente, nous pourrions avoir accĂšs Ă  une grande sĂ©rie de molĂ©cules Ă  Ă©value

    Multigram Scale Syntheses of First and Second Generation of Trifluoromethanesulfenamide Reagents

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    Trifluoromethanesulfenamide reagents constitute a family of very efficient reagents to trifluoromethylthiolate various molecules. Optimized syntheses have been developed to easily obtain, in a reproducible manner, large quantities of these reagents, with good overall yields. Up to 84 g have already been obtained, at a reasonable cost
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