Synthesis of analogs of marin alkaloids with potential anti-tumoral activity

En ce début de 21ème siècle, le cancer fait plusieurs millions de victimes dans le monde chaque année. Si cette maladie s’affirme comme un problème de santé publique, le souci économique qu'il exerce auprès des sociétés n'est pas moins important.Les Carbazoles et les Pyrroloiminoquinones sont des familles de molécules très diversifiées appartenant aux alcaloïdes, pouvant offrir de nombreuses activités thérapeutiques notamment en tant qu'anticancéreux. Si la liste des molécules actives connues et leurs traitements liés aux molécules d'origine naturelle ou synthétique est longue, il apparaît clairement que la recherche de nouvelles structures reste importante encore aujourd'hui afin de proposer de nouveaux traitements ou de mieux comprendre cette pathologie.Dans cette démarche et à travers divers objectifs d'intérêt chimique, ce mémoire présente la synthèse de différents composés, analogues de ces molécules naturelles à potentiel antitumoral, avec comme particularité le noyau 4,4-diméthyl-1 ,2,3,4-tétrahydroquinoléine.At this beginning of 21th century, the cancer makes several million victims in the world every year. If this disease asserts itself as a problem of public health, the economic concern which it exercises with societies isnot less important.Carbazoles and Pyrroloirninoquinones are families of very diversified molecules belonging to alkaloids,being able to offer numerous therapeutic activities in particular as anticancer drugs.If the list of the known active molecules and their treatments connected to the molecules of natural orsynthetic origin is long, it seems c1 early that the research for new structures remains important even today topropose of new treatment or to understand better this pathology. In our approach and through diverse objectives of chemical interest, this report present the synthesis of variouscompounds, analogues of these natural molecules with potentiel antitumoral properties, with as particularity the 4,4-dimethyl-1 ,2,3,4-tetrahydroquinoleine pattern

α-Lithiation and Electrophilic Substitution of 1,4,4-Trimethyl-3,4-dihydroquinolin-2-one

Treatment of 1,4,4-trimethyl-3,4-dihydroquinolin-2(1H)-one (2) with lithium diisopropylamide (LDA) followed by a wide range of electrophiles give the corresponding 4,4-dimethyl-3-substituted-3,4-dihydroquinolin-2-ones 3-13, providing a very mild electrophilic substitution of the 4,4-dimethyl-1,2,3,4-tetrahydroquinoline core

Regiocontrolled Microwave Assisted Bifunctionalization of 7,8-Dihalogenated Imidazo[1,2-a]pyridines: A One Pot Double-Coupling Approach

International audienceThe reactivity of the 7-chloro-8-iodo- and 8-chloro-7-iodoimidazo[1,2-a]pyridines 1a-e diversely substituted on the 2 position, towards Suzuki-Miyaura, Sonogashira, and Buchwald-Hartwig cross-coupling reactions as well as cyanation was evaluated. Various methodologies are proposed to introduce aryl, heteroaryl, alkyne, amine or cyano groups in the two positions depending on the nature of the substituent present in position 2. In both series, the substitution of the iodine atom was totally regioselective and the difficulty was to substitute the chlorine atom in a second step. Until now, only hetero(aryl) groups could be introduced though Suzuki-Miyaura cross-coupling. We overcame this problem evaluating both regioisomers in parallel. The double coupling approach was also studied allowing the one pot Suzuki/Suzuki, cyanation/Sonogashira and cyanation/Buchwald reactions leading to polyfunctionnalized imidazo[1,2-a]pyridines

Poly(3-Hexylthiophene) vs. Spiro-OMeTAD as Hole Transporter Materials for ssDSSCs

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Well-designed poly(3-hexylthiophene) as hole transporting material: A new opportunity for solid-state dye-sensitized solar cells

International audienceAll solid-state dye-sensitized solar cells (ss-DSSCs) based on the reference D102 organic dye and using poly(3-hexylthiophene) (P3HT) as hole transporting material were fabricated and compared to the most used 2,2′,7,7′-tetrakis-(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD). Power conversion efficiency of 4.78% was reached with P3HTvs. 3.99% with spiro-OMeTAD, which emphasizes that polythiophene derivatives remain serious alternatives to spiro-OMeTAD for efficient and low-cost photovoltaic energy conversion. Here, P3HT combining high regioregularity, medium-range molecular weight and narrow dispersity was targeted. The ability of those P3HT chains to form semicrystalline domains upon annealing leads to improved hole mobility, photocurrent collection and thus, device performance

Poly(3-hexylthiophene) vs. Spiro-OMeTAD as hole transporter materials for ss-DSSCs

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In Depth Analysis of Photovoltaic Performance of Chlorophyll Derivative-Based “All Solid-State” Dye-Sensitized Solar Cells

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Novel Hepatitis B Virus Capsid Assembly Modulator Induces Potent Antiviral Responses In Vitro and in Humanized Mice

International audienceHepatitis B virus (HBV) affects an estimated 250 million chronic carriers worldwide. Though several vaccines exist, they are ineffective for those already infected. HBV persists due to the formation of covalently closed circular DNA (cccDNA)-the viral minichromosome-in the nucleus of hepatocytes. Current nucleoside analogs and interferon therapies rarely clear cccDNA, requiring lifelong treatment. Our group identified GLP-26, a novel glyoxamide derivative that alters HBV nucleocapsid assembly and prevents viral DNA replication. GLP-26 exhibited single-digit nanomolar anti-HBV activity, inhibition of HBV e antigen (HBeAg) secretion, and reduced cccDNA amplification, in addition to showing a promising preclinical profile. Strikingly, long term combination treatment with entecavir in a humanized mouse model induced a decrease in viral loads and viral antigens that was sustained for up to 12 weeks after treatment cessation