16 research outputs found

    Ring expansion : synthesis of α-trifluoromethyl piperidines and azepanes

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    L'introduction d'atomes de fluor sur des composĂ©s organiques peut avoir une forte influence sur les propriĂ©tĂ©s physico-chimiques, ainsi que sur l'activitĂ© biologique de ces composĂ©s. Par ailleurs, des amines possĂ©dant un groupement trifluoromĂ©thyle en peuvent prĂ©senter un rĂ©el intĂ©rĂȘt en chimie mĂ©dicinale, de par la grande prĂ©sence des amines dans les composĂ©s bioactifs. Dans un tel contexte, nous avons dĂ©veloppĂ© deux nouvelles voies de synthĂšses permettant la formation de 2 (trifluoromĂ©thyl)pipĂ©ridines et 2-(trifluoromĂ©thyl)azĂ©panes par agrandissement de cycle de pyrrolidines trifluoromĂ©thylĂ©es obtenues Ă  partir de la L-proline. Les 2 (trifluoromĂ©thyl)pipĂ©ridines Ă©nantio-enrichies substituĂ©es en C3 ont Ă©tĂ© formĂ©es via un aziridinium intermĂ©diaire, et les 2 (trifluoromĂ©thyl)azĂ©panes substituĂ©s en C4 ont Ă©tĂ© obtenues via un azĂ©tidinium intermĂ©diaire. La rĂ©giosĂ©lectivitĂ© de l'attaque nuclĂ©ophile sur l'aziridinium ou l'azĂ©tidinium intermĂ©diaire est induite par la position du groupement trifluoromĂ©thyle (CF3). Les pipĂ©ridines et les azĂ©panes ainsi synthĂ©tisĂ©s, ont Ă©tĂ© obtenus avec une trĂšs bonne diastĂ©rĂ©osĂ©lectivitĂ©.The incorporation of fluorine atom in organic compounds can have a profound impact on the physico-chemical properties and, therefore, on the biological activity of the molecules. Thus, amines possessing an α-trifluoromethyl substituent are of great importance in medicinal chemistry, as amines are present in a variety of bioactive compounds. In this context, we have developed a new access to 3 substituted 2-(trifluoromethyl)piperidines and 4 substituted 2 (trifluoromethyl)azepanes by stereospecific ring expansion of trifluoromethylated pyrrolidines synthesized from L-proline. 3 Substituted 2 (trifluoromethyl)piperidines were obtained from trifluoromethylated prolinol via an aziridinium intermediate, and 4-substituted 2 (trifluoromethyl)azepanes were formed from pyrrolidines via an azetidinium intermediate. The regioselective attack of the nucleophile on the aziridinium or azetidinium intermediate, is induced by the position of the trifluoromethyl group (CF3). The resulting piperidines and azepanes are produced with good diastereoselectivity

    Agrandissement de cycle : synthÚse de pipéridines et d'azépanes α-trifluorométhylés

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    The incorporation of fluorine atom in organic compounds can have a profound impact on the physico-chemical properties and, therefore, on the biological activity of the molecules. Thus, amines possessing an α-trifluoromethyl substituent are of great importance in medicinal chemistry, as amines are present in a variety of bioactive compounds. In this context, we have developed a new access to 3 substituted 2-(trifluoromethyl)piperidines and 4 substituted 2 (trifluoromethyl)azepanes by stereospecific ring expansion of trifluoromethylated pyrrolidines synthesized from L-proline. 3 Substituted 2 (trifluoromethyl)piperidines were obtained from trifluoromethylated prolinol via an aziridinium intermediate, and 4-substituted 2 (trifluoromethyl)azepanes were formed from pyrrolidines via an azetidinium intermediate. The regioselective attack of the nucleophile on the aziridinium or azetidinium intermediate, is induced by the position of the trifluoromethyl group (CF3). The resulting piperidines and azepanes are produced with good diastereoselectivity.L'introduction d'atomes de fluor sur des composĂ©s organiques peut avoir une forte influence sur les propriĂ©tĂ©s physico-chimiques, ainsi que sur l'activitĂ© biologique de ces composĂ©s. Par ailleurs, des amines possĂ©dant un groupement trifluoromĂ©thyle en peuvent prĂ©senter un rĂ©el intĂ©rĂȘt en chimie mĂ©dicinale, de par la grande prĂ©sence des amines dans les composĂ©s bioactifs. Dans un tel contexte, nous avons dĂ©veloppĂ© deux nouvelles voies de synthĂšses permettant la formation de 2 (trifluoromĂ©thyl)pipĂ©ridines et 2-(trifluoromĂ©thyl)azĂ©panes par agrandissement de cycle de pyrrolidines trifluoromĂ©thylĂ©es obtenues Ă  partir de la L-proline. Les 2 (trifluoromĂ©thyl)pipĂ©ridines Ă©nantio-enrichies substituĂ©es en C3 ont Ă©tĂ© formĂ©es via un aziridinium intermĂ©diaire, et les 2 (trifluoromĂ©thyl)azĂ©panes substituĂ©s en C4 ont Ă©tĂ© obtenues via un azĂ©tidinium intermĂ©diaire. La rĂ©giosĂ©lectivitĂ© de l'attaque nuclĂ©ophile sur l'aziridinium ou l'azĂ©tidinium intermĂ©diaire est induite par la position du groupement trifluoromĂ©thyle (CF3). Les pipĂ©ridines et les azĂ©panes ainsi synthĂ©tisĂ©s, ont Ă©tĂ© obtenus avec une trĂšs bonne diastĂ©rĂ©osĂ©lectivitĂ©

    L'image de la femme maléfique dans "The Scarlet Letter", "Madame Bovary" et "Drammi intimi" chez Hawthorne, Flaubert et Verga

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    Le discours mĂ©dical, idĂ©ologique et bourgeois du XIXe siĂšcle rĂ©pand l'idĂ©e d'une fĂ©minitĂ© ancrĂ©e dans un destin biologique. La femme est prĂ©sentĂ©e uniquement comme un instrument de reproduction. "FĂ©minitĂ©" est synonyme d'inexistence, de silence, d'effacement et de nullitĂ©. Etudions l'antithĂšse, le contre-modĂšle, l'image de la femme malĂ©fique. Elle bouleverse le schĂ©mas habituel imposĂ© par les hommes, dĂ©range et franchit les limites interdites. Fille de Satan, femme d'ombre, elle incarne le mal. Elle s'offre comme une crĂ©ature impudique, un Ă©lĂ©ment perturbateur, un ĂȘtre dĂ©moniaque : elle vĂ©hicule le mahleur universel. Instrument de damnation, vagin castrateur, gouffre infernal, elle terrifie l'homme. Elle engendre le dĂ©sastre et la destruction. L'optique masculine tĂ©moigne. Dans cette sociĂ©tĂ© patriarcale, elle reprĂ©sente le mĂąle manquĂ© ; atteinte du complexe de virilitĂ©, elle exagĂšre son attitude virile; Elle se sent enchaĂźnĂ©e ; elle conteste sa position, se rĂ©volte et revendique des droits nouveaux : naissance d'une femme nouvelle.NICE-BU Lettres Arts Sci.Hum. (060882104) / SudocLIMOGES-BUFR Lettres (870852224) / SudocSudocFranceF

    Synthesis of Substituted α-Trifluoromethyl Piperidinic Derivatives

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    A comprehensive survey of pathways leading to the generation of α-trifluoromethyl monocyclic piperidinic derivatives is provided (65 references). These compounds have been synthesized either from 6-membered rings e.g., pipecolic acid or lactam derivatives by introduction a trifluoromethyl group, from pyridine or pyridinone derivatives by reduction, and from 5-membered rings e.g., prolinol derivatives by ring expansion, from linear amines by cyclization or from dienes/dienophiles by [4 + 2]-cycloaddition

    Stereoselective Rearrangement of (Trifluoromethyl)prolinols to Enantioenriched 3‑Substituted 2‑(Trifluoromethyl)piperidines

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    3-Substituted 2-(trifluoromethyl)­piperidines <b>B</b> were synthesized by ring expansion of (trifluoromethyl)­prolinols <b>A</b>, which were obtained from l-proline via an aziridinium intermediate <b>C</b>. The ring opening of the (trifluoromethyl)­aziridinium intermediate by different nucleophiles is regio- and diastereoselective

    Structure-based design, synthesis and evaluation of a novel family of PEX5-PEX14 interaction inhibitors against Trypanosoma.

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    Trypanosomiases are neglected tropical diseases caused by Trypanosoma (sub)species. Available treatments are limited and have considerable adverse effects and questionable efficacy in the chronic stage of the disease, urgently calling for the identification of new targets and drug candidates. Recently, we have shown that impairment of glycosomal protein import by the inhibition of the PEX5-PEX14 protein-protein interaction (PPI) is lethal to Trypanosoma. Here, we report the development of a novel dibenzo[b,f][1,4]oxazepin-11(10H)-one scaffold for small molecule inhibitors of PEX5-PEX14 PPI. The initial hit was identified by a high throughput screening (HTS) of a library of compounds. A bioisosteric replacement approach allowed to replace the metabolically unstable sulphur atom from the initial dibenzo[b,f][1,4]thiazepin-11(10H)-one HTS hit with oxygen. A crystal structure of the hit compound bound to PEX14 surface facilitated the rational design of the compound series accessible by a straightforward chemistry for the initial structure-activity relationship (SAR) analysis. This guided the design of compounds with trypanocidal activity in cell-based assays providing a promising starting point for the development of new drug candidates to tackle trypanosomiases
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