Дисертації з теми "Catalyse photoredox au cuivre"
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Noirbent, Guillaume. "Nouveaux systèmes d'amorçage radicalaire : la catalyse photoredox comme nouvelle stratégie pour la synthèse de polymère." Electronic Thesis or Diss., Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0359.
Повний текст джерелаIn recent years, photopolymerization has been the subject of intense research efforts due to the constant growth of industrial applications. It is a quick process that can be performed at room temperature, solvent-free conditions and enables to get a spatial and a temporal control of the polymerization process. In recent years, the use of irradiation conditions that constitutes an alternative to the UV photopolymerization processes at the origin of numerous safety concerns are actively researched. Therefore, the development of new photoinitiating systems which absorb strongly in the visible or near infrared region are actively researched by both the academic and industrial communities. Nevertheless, even if some results are promising, the reported systems are often characterized by moderate reactivities and hardly compete with current UV systems. In this context, we have synthesized a large library of photosensitive molecules capable of absorbing light in the visible or near infrared range and capable of initiating a polymerization reaction with a photoinitiating system based on photoredox catalysis. In this manuscript, we present both the synthesis and the polymerization abilities of different families of dyes. Their photochemical properties were also studied by UV-Visible spectrometry, luminescence, photolysis, temperature monitoring and electronic paramagnetic resonance experiments. Applications such as 3D printing and laser write experiments are also presented
Barreto, Shauna. "Utilisatiοn de la catalyse phοtοredοx au cuivre et de la mécanοchimie pοur la synthèse de cοmpοsés fluοrés. Etude de l'activité biοlοgique de nοuveaux cοmpοsés fluοrés et de peptides". Electronic Thesis or Diss., Normandie, 2025. http://www.theses.fr/2025NORMR009.
Повний текст джерелаThe fluorine atom plays a crucial role in modulating the physicochemical properties of organic molecules. Its incorporation into the structure of drugs has expanded rapidly and significantly. Due to its strong electronegativity and lipophilicity, the trifluoromethyl moiety is commonly used by the pharmaceutical industry. In addition, among fluorinated compounds, monofluoroalkenes are also of great importance in medicinal chemistry. In this context, we were interested in the development of synthetic pathways to incorporate trifluoromethyl and monofluoroalkene moieties into molecules. In a first project, we developed a method of chlorotrifluoromethylation of internal alkenes, mediated by visible light and catalyzed by a copper-based photoredox catalyst. The reaction took place with full regioselectivity under mild reaction conditions using commercially available CF3SO2Cl as the source of trifluoromethyl and chlorine, leading to a synthesis of value-added chemicals with atom economy. The molecules obtained were tested in vitro to evaluate their cytotoxicity against cancer cell lines as well as for their antifungal and antibacterial activities. In a second project, a solvent-free synthesis was developed by mechanochemistry to access monofluoroalkenes. The very fast, solvent-free one-step reaction under mild conditions has limited the environmental impact of synthesis. The protocol showed general efficacy and tolerance to a wide range of carbonyl substrates, including aldehydes and ketones, and fluorophosphonoacetate derivatives.Chronic pain affects 20 to 30% of the world's population and represents billions of dollars in annual costs. It represents a real public health issue that makes it essential to continue scientific research in this field to better understand chronic pain and develop innovative solutions to improve the quality of life of patients. Peptides are prime targets in the synthesis of new drugs. The neurotensin peptide (8-13) has demonstrated its efficacy in the treatment of pain, by modulating nociceptive signals, by binding to neurotensinergic receptors, mainly NTS1 and NTS2. Nevertheless, binding to the NTS1 receptor causes harmful side effects, which is not the case when binding to NTS2. Thus, a high selectivity towards the NTS2 receiver is essential. However, the high selectivity of the NT(8-13) peptide towards the NTS1 receptor does not make this peptide a compound of choice for pain treatment. Thus, synthesizing peptide analogues capable of selectively interacting with NTS2, with the aim of improving their efficacy and pharmacological profile while minimizing side effects, represents a challenge of choice. In this context, this chapter describes the synthesis of compounds capable of binding to neurotensinergic receptors while maximizing selectivity towards NTS2. For this, peptide synthesis of JMV 7323, JMV 7324, JMV 7325 and JMV 7326 on solid support was performed. In addition, the resulting peptides must be able to cross the blood-brain barrier. For this, the angiopep-2 peptide was coupled to the JMV 7324 peptide to be used as a shuttle to reach the blood-brain barrier. The compounds were tested in vivo in models of formalin-induced pain showing promising results and side effects were studied
Baralle, Alexandre. "Procédés redox et photoredox impliquant des complexes de cuivre(I) et de cuivre(II)." Paris 6, 2013. http://www.theses.fr/2013PA066785.
Повний текст джерелаThe work described in this Ph. D. Thesis is devoted to the development of new methodologies allowing radicals formation using redox process. We started with potassium trifluoroborates oxidation using copper(II), leading to the formation of alkyls radicals. These radicals can react in an intermolecular way to form carbon-carbon bonds. Moreover, it has been proved that the reaction conditions are compatible with usual organic functions showing the usefulness of this reactivity in organic synthesis. Aware of the importance of arylation in organic synthesis we then developed methodology to frorm aryl radical by iodonium salts reduction using copper(I) polypyridine photoactivable complex. This second study had a part in the rise of first line metals photoredox chemistry. Allowing the replacement of ruthenium(II) and iridium(III) complexes. A mechanistic insight allowed us to plan a further development of new photoactivable copper catalysts and their use in organic synthesis
Chenneberg, Ludwig. "Nouvelles avancées en catalyse photoredox : applications en chimie radicalaire de synthèse et en catalyse duale." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066305/document.
Повний текст джерелаVisible-light photoredox catalysis has emerged as a very powerful strategy to generate radical species replacing more and more tin-mediated or stoichiometric redox methodologies. The main objective of the research described in this Ph. D. thesis is to develop new synthetic methodologies in radical and organometallic chemistry, and merge them in a dual catalysis process for the preparation of elaborated molecular building blocks. In a first study, we report a photocatalytic alternative of Barton-McCombie deoxygenation based on a visible-light photoreduction of O-thiocarbamates derived from secondary and tertiary alcohols. A mechanistic investigation is presented based on fluorescence quenching and cyclic voltammetry experiments. In a second study, a challenging method of generation of unstabilized alkyl radicals by photooxidation of borate salts or hypervalent silicon species is reported. These radicals are trapped by free radical scavengers or engaged in a photoredox/nickel dual catalysis
Barthelemy, Anne-Laure. "Synthèse de sulfoximines perfluorées hautement fonctionnalisées et de sulfilimino iminiums. : Etude de leur application dans des réactions de perfluoroalkylation par catalyse photoredox." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV080/document.
Повний текст джерелаFluorine atom is essential in our everyday life. It is necessary for the development of battery, refrigeration (Fréon), liquid crystals which constitute the screens of phones, or materials (Téflon®). But its main role is in life sciences. The introduction of a fluorine atom modifies the physical and chemical properties of organic molecules, allowing to modulate and to enhance their biological activities. Its introduction in organic molecules constitutes a key challenge for chemists, which necessitates continually the development of new reagents for fluoration or perfluoroalkylation reactions. Among these, perfluorinated sulfoximines are electrophilic, nucleophilic or radical perfluoroalkylating reagents. Moreover, perfluorinated sulfoximines have peculiar properties with uses in material or life sciences.My PhD work falls within the project of our laboratory to develop a new general acces to perfluorinated sulfoximines and the synthesis of highly functionalized sulfoximines. My PhD work also deals with the synthesis of sulfilimino iminiums, derived from sulfoximines, which are efficient and versatile reagents for visible light-induced perfluoroalkylation reactions
Daniel, Marion. "Nouveaux développements de la catalyse photoredox : oxydation de composés β-dicarbonylés et d’amides". Paris 6, 2013. http://www.theses.fr/2013PA066474.
Повний текст джерелаThe aim of this Ph. D. Work was to develop the photoredox catalysis for oxidative reactions. We were first interested in the oxidation of secondary amides. Thus, the synthesis of γ - lactams and δ - lactams were possible with manganese complexes in one step. Tandem reactions have also been successfully completed. Then, we realized the oxidation of β-dicarbonyl compounds by photoredox catalysis. The use of the tritylium tetrafluoroborate, as a new oxidative quench, allowed us to achieve the dimerization of ethyl benzoylacetate in a quantitative yield. The scopes of the dimerization and the oxyamination were presented. Intermolecular reactions have also been possible with allylsulfones and allylstannanes. Finally, cascade reactions were performed, in which two carbon-carbon bonds were created, in one step, and by a photocatalytic pathway
Lebée, Clément. "Nouvelles méthodes catalytiques d’accès aux amines α,β-fonctionnalisées". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS169.
Повний текст джерелаDevelopment of methods α,β-functionalization of amines andformation of optically active heterocycles via the use of the organocatalysis and thephotoredox catalysis
Fidaly, Kassim. "α-Alkylation énantiosélective d’aldéhydes par photosensibilisation redox organocatalysée dans le visible". Paris 6, 2012. http://www.theses.fr/2012PA066019.
Повний текст джерелаThe concept of SOMO activation was introduced recently in organocatalysis by D. W. C. MacMillan, enabling a large panel of new enantioselective α-fonctionnalisations of aldehydes. This new generic activation mode implies the essential need of an oxidant in stœchiometric amount to get in situ the key species of a highly reactive enaminum radical cation from the enamine. This work has been determined to correspond with a new challenge of merging two great areas of organic chemistry, photochemistry with organocatalysis. First investigations were established using catalytic amount of Ru(bpy)32+ as the electron transfer agent. Herein, we propose a new approach of photoredox catalysis, fully into line with the concept of organocatalysis, avoiding the use of any metal. Such a perspective associates a fully organic photosensitizer like xanthene derivatives as SET agent with a chiral auxiliary, within two catalytic cycles. First, the feasibility of the electron transfer was investigated on enamines. This study was then transposed to the enantioselective α-alkylation of aldehydes and was optimized taking into account notably salt and solvent effects associated with the light source providing an efficient photosensitized SOMO activation with good yields and enantioselectivities
Languet, Morgan. "Fonctionnalisation d'hétérocycles par catalyse organométallique et photorédox." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066497/document.
Повний текст джерелаThe work presented in this manuscript concerns two methods of functionalization of heterocycles by using organometallic catalysis. Firstly, the introduction of an olefinic moiety at the C3 position of 5-membered heterocycles was achieved by a catalytic system based on the use of a rhodium(III) salt and a silver salt. Despite some limitations in the scope, this method was found to be particularly effective for the introduction of an acrylate group at the C3 position of these heterocycles. Furthermore, the use of carbamate as a directing group, has allowed a large number of post-functionalization reactions such as cross-couplings catalyzed by nickel and iron salts. The second part of our work was devoted to the arylation of 2-quinolone at the C3 position by photoredox catalysis. More particularly, under mild conditions (ambient temperature, without additives), the arylation of these 2-quinolones was carried out using aryldiazonium tetrafluoroborate salts as a precursor of aryl radicals. Control experiments, measurements of UV-visible absorption spectra and an ON/OFF experiment were also performed to elucidate the mechanism of this photocatalysed arylation
Adouama, Cherif. "Développement de méthodologies de SRN1 et de catalyse photoredox pour la synthèse d’indoles tétracycliques." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1223/document.
Повний текст джерелаThe development of new, soft and ecofriendly synthetic methodologies is today a real need. In this context, radical Chemistry allows to make a wide diversity of reactions thanks to soft initation steps (electrochemical or photochemical). Tetracyclic indoles and gem-difluoroacyles molecules, present in a lot of therapeutic compounds, appeared as relevant targets. 3,4-fused tetracyclic indoles, had been synthesized by Unimolecular Nucleophilic Radical Substitution (SRN1). Since the 1960s, SRN1 reaction allows coupling reactions between a nucleophilic species and a radical acceptor to be performed. On the other hand, gem-difluoroacyles tetracyclic indoles had been synthesized by tandem radical cyclisation initiated by electrochemical and photoredox catalysis. Since its rediscovery by the end of the 2000s, photoredox catalysis, similar to electrocatalysis, had seen an increasing interest. Photoredox catalysis is based on the use of a photocatalyst that become an oxidant or a reductant under visible irradiation
Bouquin, Maxime. "Formation de liaisons C-C et C-hétéroatome catalysée par des métaux plus respectueux de l'environnement ou en leur absence." Electronic Thesis or Diss., Montpellier, Ecole nationale supérieure de chimie, 2022. https://theses.enscm.fr/ENSCM_2022_BOUQUIN.pdf.
Повний текст джерелаThe proposed research program is within the general framework of green syntheses for sustainable chemistry through the development of new catalytic systems performing challenging reactions. More specifically, the objectives of our project lie within the framework of transition metal catalyzed or transition metal free mediated/catalyzed arylation of nucleophiles (coupling of N-, O-, S-, P-, C-nucleophiles with aromatic halides). This type of reaction, which allows the formation of C-N, C-O, C-C, C-S or C-P bonds, is without any doubt one of the most important transformation in organic synthesis. Numerous types of catalytic systems have been described in this field, mainly based on nickel, palladium and more recently copper. The families of aromatic molecules obtained (Ar-Nu) by these reactions are very interesting building blocks since they constitute the main part (about 70%) of active molecules in life sciences (pharmaceuticals, agrochemicals) and of many material precursors. This reaction is thus of major importance for industry. The proposed research program, which focuses on the discovery of novel competitive and environmentally friendly catalytic systems for this type of reactions, belongs to the field of sustainable development (non-toxic, non-polluting, low cost catalytic systems – REACH regulation). The project will be implemented following 2 synthetic objectives (Transition metal free mediated C-C and C-heteroatom bond formations and New concept for the Cu-catalyzed arylation of nucleophiles from ArCl), complemented by a transversal one (Mechanistic study)
Lévêque, Christophe. "Photooxydation de silicates hypercoordinés pour la génération de radicaux carbonés : processus radicalaires et catalyse duale." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066209.
Повний текст джерелаPhotoredox catalysis in visible light has succeeded in establishing itself as a gentle and eco-compatible method of formation of radical species, and more particularly of carbon radicals. Although this catalysis has proved to be efficient for the formation of carbon-carbon/heteroatom bonds, the generated carbon centered radicals are oftenverystabilized.Conversely, bis-catecholato silicates have shown to be capable of generating alkyl radicals that are not stabilized by photooxidation using polypyridine complexes of transition metals (Ru, Ir) that are photoactive in visible light but also organic photocatalysts. The radicals formed can thus be trapped by various radical acceptors. In addition, the bis-catecholato silicates can be employed in cross-coupling reactions with alkene halides and (hetero)aromatic halides under photoredox/nickel dual catalysis conditions for the formation of C(sp2) – C(sp3) bonds. The methodology can also be extended to C(sp3) – C (sp3) with some limitations. On the other hand, a study comparing the silicates and the "ate-complex" of boron for the formation of radicals by oxidation process is presented. Finally, promising works on the oxidation of silicates by copper complexes bearing non-innocent ligands have been initiated
Blieck, Rémi. "Hydrofonctionnalisations intermoléculaires d'allènes catalysées au cuivre." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2017. http://www.theses.fr/2017ENCM0017/document.
Повний текст джерелаAllenes were perceived as scientific oddity for a long time, due to their particular reactivity. But they are currently attracting a growing interets of chemists since the discovery of efficient synthesis for these compounds in the past few decades. During this thesis, we focused on intermolecular hydrofunctionalization of these substrates. Hydrofunctionalization process generally avoid the production of any wastes, and give an efficient access to a large scope of valuables compounds. Until now, allenes hydrofunctionalizations required the use of catalytic systems using precious metals combined with complex ligands. Our goal was to perform this sort of reaction with a simplest possible system using a cheap metal with low-toxicity : copper. We started studying hydroaminations process, which were realized on a large scope of allenes. Subsequently, we wanted to demonstrate the potential of our new catalytic system and so applied it for the creation of C-C and C-O bonds
Sauvageot, Elodie. "Nouveaux complexes d’Ir(III) à ligands azotés : catalyse photoredox (enantiosélective) et inhibition du TNF-alpha." Caen, 2015. http://www.theses.fr/2015CAEN2061.
Повний текст джерелаIn the context of green and sustainable chemistry, visible light-mediated photoredox catalysis has become a rapidly growing field in the last few years. This new tool allowed to achieve numerous and diverse chemical transformations in mild conditions. However, stereoselective reactions are still rare and require the presence of polarized bonds on the substrates. The aim of this thesis was to develop new chiral catalysts, especially artificial metalloenzymes, for stereoselective applications on a broad range of substrates. This work was completed in two steps: (i) synthesis and catalytic evaluation of iridium(III) and ruthenium(II) complexes bearing adjustable dipyridylamine ligands; (ii) incorporation of the complexes exhibiting the best photocatalytic activity within protein, such as glucosidases and streptavidin. The activity of the new biohybrids catalysts was then assessed in photoredox catalysis. Anti-inflammatory properties of iridium(III) complexes were also evaluated in vitro as potent inhibitors of TNF-/TNFR-1 interaction. The results obtained during this work pave the way toward a new class of photoredox catalysts and TNF-inhibitors
Fortier, Lucas. "Réactivité de la fonction acide carboxylique en catalyse photoredox : applications à la valorisation d'acides gras biosourcés." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILR068.
Повний текст джерелаThis thesis contributes to the development of more environmentally friendly chemical processes, addressing current environmental challenges. It explores the use of bio-based molecules and eco-responsible syntheses, focusing on photocatalysis, rapidly expanding approaches. The research centers on the potential of carboxylic acids in photoredox catalysis for synthesizing valuable organic compounds, offering alternatives to conventional methods that are often energy-intensive and less environmentally friendly. The thesis is structured into three main chapters. The first provides a theoretical introduction to photocatalysis, covering its principles and recent advances. The second chapter develops two novel decarboxylative C-C coupling methods between fatty acids and radical acceptors, aimed at producing monomers for biobased polymers and surfactants. This process leverages bio-based fatty acids as an alternative to petroleum-derived precursors, adhering to green chemistry principles and aiming for sustainable production of functional molecules. The third chapter explores the synthesis of phthalides, compounds with significant biological and pharmacological properties, using mild photocatalytic conditions. This approach avoids more energy-intensive methods and relies on organic catalysts to optimize reaction efficiency and selectivity. This work represents an advancement in organic and materials chemistry, with applications for bio-based polymer production and the creation of new chemicals. It also opens avenues for further improvement, particularly by exploring the use of infrared light to activate reactions under even milder conditions
Narbonne, Vanessa. "Catalyse par les métaux de transition : catalyse duale palladium-norbornène pour la synthèse diastéréosélective de dibenzoazépines et construction de biaryles via catalyse photorédox médiée par un complexe de ruthénium." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS115/document.
Повний текст джерелаCatalysis by transition metal has considerably grown these decades and has become a powerful tool in organometallic chemistry. The CH ortho fonctionnalisation reaction, involving a duale palladium/norbornene catalysis, discovered at the end of the 90’s, allowed a breakthrough in the field of multi-component reactions. It provides access to polycyclic structures through an original mechanism, involving a palladacycle formation. It is the first catalytic reaction including three oxidation states of palladium (0, II and IV). In a context where the chemistry is going to be more ecocompatible, we wished taking advantage of this reaction to synthetize dibenzoazepines. They represent interesting scaffold both as organocatalysts and as bioactive compounds, however the existing synthesis don’t allow diversifying the structure of these molecules and often requiring multi-step sequences or toxic reagents. Dibenzoazepines synthesis has been realised according a three components approach from readily available reagents, a bromobenzylamine, an ortho substituted aromatic iodide and an electrowithdrawing olefin via a CH ortho fonctionnlisation/Heck/aza-Michael sequence. Remarquably, this last step presents a total diastereoselectivity. Using racemic substituted bromobenzylamine shows the same selectivity thanks to a parallel kinetic resolution-like mechanism. The access to a wide range of molecules, and the corresponding imine via a retro-Mannich mechanism using an enolisable olefin demonstrates the robustness of the ortho CH fonctionnalisation reaction. Carbon-carbon bond formation by transition metal has been largely developped since decades. However, it often generate waste and use toxic reagent at high temperature. Photoredox catalysis is a great success recently and have the advantage to use light as energy source and small amounts of metal and organocatalyst. We have developed a method of biarylic coupling via a photoredox catalysis mediated by a ruthenium complex. Arene diazonium, the precursor coupled, have the advantage to generate diazote as waste, and realise an homolytic aromatic substitution on aromatic and heteroaromatic acceptors. Moreover, it takes place at room temperature without base. It is an alternative for the biarylic coupling and an green chemistry
Bernoud, Elise. "Les Alcynylphosphines borane : synthèse et modification fonctionnelle par catalyse au cuivre." Caen, 2012. http://www.theses.fr/2012CAEN2001.
Повний текст джерелаThis thesis was devoted to alkynylphosphine boranes: their synthesis and their functional modification involving copper-catalysis. A new, simple and effective synthetic method was developed based on the copper-catalyzed alkynylation reaction of various secondary phosphine boranes (diaryl, dialkyl and alkylaryl) with differently functionalized bromoalkynes (alkyl, aryl and silyl) under mild conditions (weak base: K2CO3 or K3PO4, low temperature: 40-60 Celsius degres). This method provides a straightforward access to alkynylphosphine boranes with different steric and electronic properties in average to good yields. Preliminary mechanistic studies are consistent with the involvement of a copper-phosphido-borane complex as an intermediate. Unprecedented copper-phosphido-borane complexes were isolated and fully characterized. The synthesized alkynylphosphine boranes served as building blocks for the synthesis of triazole-phosphine boranes via a copper-catalyzed one-pot tandem reaction « desilylation/ click-chemistry », involving variously functionalized azides (benzyl, aryl and sterically hindered groups). Mild reaction conditions (room or low temperature: 50 Celsius degres, biphasic medium: H2O/tertBuOH) were developed. This procedure allows the preparation of various triazole-phosphine boranes in average to excellent yields
Salvadeo, Elena. "Nouveaux complexes polynucléaires de cuivre actifs en oxydation." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAV068/document.
Повний текст джерелаThis manuscript presents the development of new copper complexes for catalytic purposes. The design of the complexes takes inspiration from the active sites of multicopper oxidases. Three binuclear copper complexes have been synthesized and characterized, with a focus on their electrochemical behaviour and their potential use as catalysts for oxygen reduction. Spectroscopic and electrochemical studies revealed the importance of the coordination environment on the stability of the complexes. Cu(II) centers coordinated by not strong enough ligands are spontaneously reduced in solution, giving rise to mixtures of different complexes. At the same time more rigid structures capable of stabilising the two copper centers give rise to slow electron transfers, an undesirable characteristic in electrocatalysts. For these reasons more complex ligands have been synthesized, with the aim of obtaining trinuclear copper complexes with good properties as catalysts for dioxygen reduction. One of the binuclear complexes have been tested as oxidation catalyst in nitrene transfer reactions. The complex shows good performance in aziridination catalysis, both in its bis-Cu(II) and bis-Cu(I) forms. The catalytic activity have been analysed also from the mechanistic point of view. Preliminary results suggest different mechanisms of interaction of the reduced and oxidized forms of the complex with the nitrene donors
Pagès, Lucas. "Hydrofonctionnalisation d'allénamides terminaux par catalyse au cuivre : formation de liaisons C-C, C-S, C-P et C-O." Electronic Thesis or Diss., Montpellier, Ecole nationale supérieure de chimie, 2022. http://www.theses.fr/2022ENCM0017.
Повний текст джерелаOne of the main objective of the thesis is to discover new economic, non-toxic and non-polluting processes for the synthesis of targets with high added value (in the field of pharmacy and materials), starting from simple starting molecules (possibly issues from the plant world). These new processes will mainly use homogeneous catalysis and inexpensive and low-cost metal catalysts based for example on copper (the methods that these new processes are intended to replace generally make use of very expensive and highly toxic palladium based catalysts and sophisticated ligands). The research will be based on the expertise of the host team in the field of hydrofunctionalization (ref 1) of unsaturated bonds (including hydroamination) as well as in the arylation of carbon, oxygenated or nitrogenous nucleophiles (ref 2) by copper catalysis (formation of C-C and C-heteroatom bonds). The project will include a synthesis methodology part as well as a very advanced mechanistic study of the discovered catalytic systems (NMR, kinetic studies, isolation of intermediate metal complexes, DFT calculations). Application and transfer to industry, where the team has a great deal of experience, will then be considered and implemented if necessary. 1. a) Chem. Comm, 2015, 51, 11210. b) Org. Lett. 2015, 17, 1224. c) Org. Lett. 2016, 18, 1482. d) Adv. Sytnh. Cat., 2017, 349, 4388. e) ACS. Catal. 2017, 7, 425. f) Org. Lett. 2018, 20, 223. g) Synthesis, 2019, 51, 1225. 2. a) Angewandte Chemie, 2007, 46(6), 934. b) Angew. Chem. Int. Ed. 2009, 48, 337. c) Angew. Chem. Int. Ed. 2009, 48, 6954. d) Angew. Chem. Int. Ed. 2009, 48, 8725. d) Angew. Chem. Int. Ed. 2012, 51, 12815. e) Chem. Comm, 2013, 49, 7412. f) Angewandte Chemie, 2015, 54, 1058. g) Angewandte Chemie, 2016, 55, 3785
Levitre, Guillaume. "Photocatalyse et organocatalyse comme outils innovants pour la synthèse de molécules complexes." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS380.
Повний текст джерелаIn front of current environmental challenges, catalysis has become a major tool for the synthesis of complex and therapeutic molecules. In this context, we have focused on the development of new synthesis methods that are innovative, efficient, metal-free or activated by visible light. Thus, my thesis work has involved two themes that have been widely studied in our team: photoredox catalysis and organocatalysis. In this manuscript, the first part focused on the conception of photocatalyzed multicomponent reactions for the synthesis of trifluoromethylated structures with good yields. The following section devoted to the design and evaluation of new supported, robust and recyclable photocatalysts. The third part presented the formulation of formal (4+3) and (4+2) cyloaddition reactions, catalyzed with chiral phosphoric acids for an effective, enantio- and diastereo-selective synthesis of cyclohepta[b]indoles and spiroindolines. In the fourth part, a strategy combining asymmetric organocatalysis and photocatalysis for the synthesis of potentially biologically active α-substituted β-amino tryptamines was described. Finally, the elaboration of new chiral hypervalent iodine compounds and their evaluation as organocatalysts was reported in the last part of this thesis manuscript
Banoun, Camille. "Nouvelles méthodes de synthèse pour la fonctionnalisation sélective d'aldéhydes alpha,beta-insaturés." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASF008.
Повний текст джерелаThe aim of this thesis is to develop a new methodology for the selective functionalization of conjugated aldehydes. The chosen approach in our case is to use photoredox catalysis to generate radicals, which would then be able to add regioselectively onto enals. Photoredox catalysis has indeed emerged during the last twenty years as a mild method for the generation of radicals in situ, using visible light as unique energy source.The primary objective of this thesis was to use photoredox catalysis to introduce different groups on the gamma position of enals. Indeed, when they are under the form of dienol ethers, this distal gamma position becomes accessible. Thus, different radicals centered on carbon, oxygen or nitrogen could be introduced, with a perfect regioselectivity. Another non-radical approach has even been used for the incorporation of sulfur groups
Tlili, Anis. "Arylation de nucléophiles catalysés par des complexes de cuivre." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2011. http://www.theses.fr/2011ENCM0010.
Повний текст джерелаIn this thesis, several new methods of nucleophilic arylation (oxygen, nitrogen and carbon) were developed and a mechanistic study. As part of the ANR project, we have carried out work in this field in the laboratory of Dr. Anny Jutand at ENS Paris. From a general point of view we can say that our methods are well in line with the requirements of European regulations to reduce the impact of environmental chemicals (REACH) by the search for new synthetic routes less toxic and less polluting. Work in Progress and prospects : Compared to reactions involving palladium catalysts, those involving copper have been studied very little in terms of their mechanism. Early work on the mechanism of arylation of nucleophiles catalyzed copper began last few years and led to about a dozen publications. Despite some significant advances, much remains to be done
Boreux, Arnaud. "Development of new dual catalysis systems with gold and copper." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX053/document.
Повний текст джерелаDuring the last decades, transition metal catalysis has become an essential tool in organic synthesis. Each year, thousands of publications report the development of new reactions mediated by metal complexes. This manuscript depicts our contribution to this field. The first chapter presents a general comparison of the reactivity of coinage metals (Cu, Ag, Au) complexes in catalysis, with a special focus on their ability to perform electrophilic activation (Au) or nucleophilic transfer (Cu) reactions. Representative examples are given to illustrate these concepts. In the second part of the manuscript, the synthesis of trifluoromethylated allenes and enones by gold(I) catalysis is reported. A general method for the preparation of CF3-allenes has been developed based on a gold(I)-mediated 1,5-hydride shift. The scope and limitations of the method, as well as some subsequent transformations of the products are described. Using similar substrates, a gold(I)-catalyzed [3,3]-acetate rearrangement was applied to the preparation of CF3-enones. The employment of this method into a one-pot procedure involving a subsequent Diels-Alder reaction is also reported. The third part focuses on the copper(I)-catalyzed borofunctionalization of allenes. The recent reports from the literature are reviewed, and our contributions to this area of research are described through the study of a new copper(I)-catalyzed allene boroacylation method. Finally, preliminary results on the elaboration of a copper(I)/gold(I) catalytic one-pot process are presented
Gomes, Filipe. "Substitutions homolytiques aromatiques catalysées par photoredox. Synthèse totale de la Marmycine A." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS039/document.
Повний текст джерелаThe part of my research work is dedicated to biaryl couplings mediated by visible-light photoredox catalysis. We have shown that the arylation of unactivated (hetero)arenes were possible with aryldiazonium salts via homolytic aromatic substitution processes. We developed a simple and convenient method to assemble biaryls with remarkable efficiency, low catalyst loadings and broad functional group tolerance. In parallel, I worked on the total synthesis of marmycin A. Isolated in 2007 by Fenical, marmycin A belongs to the angucyclin family and possesses antiproliferative and antibiotic properties. The proposed mode of action was to kill cancer cells by targeting DNA. Limited natural resources of marmycin A prompted us to achieve the first total synthesis of this compound. With marmycin A in hands, we carried out biological studies and we have discovered that it does not target DNA but instead accumulates in lysosomes and promotes cancer cells death by means of apoptosis
Lonca, Geoffroy. "Development of new reactions of organic synthesis catalyzed by gold and copper." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX057/document.
Повний текст джерелаThis manuscript presents the development of gold- and copper-catalyzed methods for the synthesis of heterocyclic compounds and trifluoromethylated products.Firstly, a gold-catalyzed synthesis of trifluoromethyl allenes was developed, relying on a 1,5 hydride shift. This method allows to access, in a very efficient and selective way, a large range of perfluoroalkylated allenes, of which the synthetic potential was also demonstrated.Afterwards, the catalytic power of gold was then used in a synthesis of 2H-1,3-oxazines, relying on a 6-endo type cyclization of azide-yne substrates. This methods allows to access, in very mild condition, an unprecedently large range of polysubstituted oxazines in excellent yields.Finally, a method for the copper-catalyzed radical hydrofunctionalization of alkenols was developed. The strategy involved relies on a 1,5 hydrogen abstraction, in which a benzyloxy moiety plays the role of the hydrogen donor
Fall, Arona. "Donneurs d’électrons organiques : développement d’un nouveau système catalytique photoredox." Electronic Thesis or Diss., Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0607.
Повний текст джерелаDuring this last decade, the reactivity of enamine-based organic electron donor (OED) has been widely explored in electron transfer processes. With exceptionally negative redox potentials, OEDs spontaneously promote single (SET) or double electron transfer (DET) to an organic substrate, to form radical or anionic intermediates. However, the use of stoichiometric amount of OEDs limits their competitivity compared to their organometallic and organic catalysts. This thesis project consisted in developing a new catalytic system with OEDs. Different strategies were envisaged. In a first method a catalytic amount of OED would initiate the electron transfer to reduce the substrate. The oxidation of the generated radical intermediate would allow the regeneration of OED. Unfortunately, this strategy was unsuccessful. The second strategy would consist in regenerating the OED from its air-stable oxidized form OED2+ and a sacrificial electron donor (tertiary amine, sodium dithionite or Rongalite®) under photoactivation. Several optimizing steps allowed the development of a new efficient catalytic photoredox system with the oxidized form as photocatalyst and Rongalite® as sacrificial electron donor. This new photoredox catalytic system was applied to the reduction of various functionals groups (sulfone, aryl halide and triflate) by single electron transfer (SET) and double electron transfer (DET). The reactivity of the photocatalytic system was also explored in radical addition reactions
Bellanger, Corentin. "Formation et rupture de liaisons chimiques par action de la lumière visible : synthèse et études mécanistiques." Electronic Thesis or Diss., Toulouse 3, 2023. http://www.theses.fr/2023TOU30155.
Повний текст джерелаThis manuscript, entitled "Making and breaking bonds with visible light: Synthesis and mechanisms", covers the development of new synthetic procedures and their mechanistic investigations. It is divided into five chapters. The first chapter is a general introduction on the definition of visible-light and the history of photochemistry. Chapter II discloses the progress made in the challenging quaternarization of phosphiranes and the C-centered ring opening of phosphiranium salts. Extensive knowledge of the phosphorus-containing three-membered rings reactivity, namely phosphirane and phosphiranium salts, is lacking. We show that the formation of free electrophilic carbenes by visible-light irradiation of the corresponding aryldiazoacetates and their reactivity with 1-mesitylphosphirane allows the formation of phosphiranium ylides. The reactivity of the previously unknown phosphiranium ylides is explored in the presence of pronucleophiles bearing an acidic hydrogen to provide the selective carbon centered ring opening products by efficient ring strain release. Thiophenols and carboxylic acids were successfully used as reaction partners and afforded a wide scope with good yields and moderate diastereoselectivities. The experimental methodology was optimized to allow isolation and characterization of the products by oxidizing the phosphine resulting from the ring opening to a phosphine oxide. This study is finally complemented by DFT calculations to support a reasonable reaction mechanism. A pathway in good agreement with experimental observations was calculated and showed the importance of the ring strain release as the driving force of the reaction. Chapter III focuses on donor-acceptor cyanoarenes, which are widely used photocatalysts in photoredox catalysis. Examples from the literature showing the super-reducing abilities of cyanoarenes radical anions to reduce aryl chlorides are discussed in the literature. However, the use of amines as sacrificial electron donors is not chemically innocent and further investigations were required. One way to complement this study is by electrochemically reducing the cyanoarenes. In chapter III, we show that the electrochemical generation of donor-acceptor cyanoarenes' radical anion is a clean and efficient method. The study of their photophysical properties in the presence and absence of chlorobenzene provided different results compared to a previous literature report and add more data to the current debate on the ability of radical anions to act as super-reducing agents. Part of this chapter is devoted to the study of the interaction between the strong Lewis acid B(C6F5)3 and donor-acceptor cyanoarenes. The coordination induces important structural and photophysical modifications. An electrochemical study shows that the coordination of the reduced cyanoarene to the same Lewis acid is favored but that the resulting adduct is unstable and leads to the decomposition of the Lewis acid. Chapter IV addresses the challenging cleavage of the fluorine-carbon bond in aryl fluorides. If these molecules are successfully provided an extra electron by electron transfer, the carbon-fluorine bond is known to be able to dissociate to provide the fluoride anion as well as the corresponding aryl radical. This step requires strong reducing agents, and only few of them are reported in the literature. The visible light-mediated germanylation of aryl fluorides is reported with a particular focus on the super-reducing properties of the triphenylgermanyl anion's excited state. By simply combining readily available fluoro-arenes with germanes in the presence of a base and under blue irradiation, tetraarylgermanes were synthesized in reasonable to good yield. Experimental and theoretical investigations have been undertaken and a reasonable reaction mechanism is discussed. Finally, chapter V gives a general conclusion to the manuscript by summarizing the different results obtained and the outlooks for each chapter
Carboni, Aude. "Développement de nouvelles réactions de trifluorométhylation photocatalysées : difonctionnalisation vicinale d'alcènes." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS110/document.
Повний текст джерелаOver the past decade, organic fluorine chemistry has attracted wide interest due to the unique nature of this halogen which modifies the physicochemical properties of molecules. Numerous fluorinated compounds are nowadays used in medicine and crop science. These features have stimulated the development of new strategies for the efficient introduction of fluorine, especially the trifluoromethyl group into organic molecules. Among the contemporary methods, visible-light photoredox trifluoromethylation of alkenes is an efficient and attractive strategy. This first aim was to develop a methodology giving rise to original β-trifluoromethylamines. We could efficiently perform a photocatalyzed α-β-difunctionalization of enecarbamates through a three-component reaction between enecarbamates, Togni reagent, and a nucleophile: alcohol, cyanide or azide. Another approach uses styrenes, which are commercially available compounds or easily accessible. The nitrogen atom was introduced by concomitant addition of a CF₃ group and an azido or amino function. The second project of my PhD was to extend this methodology to aromatic or heteroaromatic nucleophiles leading to the formation of 1,1 diarylalkane derivatives, which are present in many biologically active products. Changing the nucleophilic partner to halogen (chlorine, bromine or iodine) is also very effective. Finally, the photoredox-mediated process has been applied to the synthesis of 1,3-dihydroisobenzofurans, commonly named phthalans and their nitrogen analogs: 1,3-isoindolines
Abi, Aad Edmond. "Préparations, caractérisations et aspects catalytiques d'oxydes ternaires à base de cuivre, aluminium et cérium." Lille 1, 1996. http://www.theses.fr/1996LIL10008.
Повний текст джерелаLa grande dispersion du cuivre sur l'alumine associée à la synergie cuivre-cérium semble être favorable à l'activité catalytique des systèmes. Ainsi, toute activité (hydrogénation et isomérisation) est liée à la présence de cuivre, elle est exaltée quand le cuivre est en interaction avec le cérium. Outre les effets liés au solide, activité et sélectivité sont fortement tributaires des encombrements stériques et des effets électroniques propres à la molécule de réactif. Ainsi, moins la double liaison de l'hydrocarbure est encombrée plus l'activité est importante. De même, plus le réactif est polaire plus la sélectivité en hydrogénation est favorisée. Le mécanisme de réaction proposé est une balance entre le passage par un intermédiaire -alkyl conduisant préférentiellement au produit d'hydrogénation et un mécanisme concerte dont le résultat est un produit d'isomérisation de position. L'équilibre de cette balance dépend essentiellement de la polarité du réactif utilisé
Xia, Ning. "Arylations de nucléophiles azotés et oxygénés catalysées par des complexes du fer ou du cuivre." Montpellier 2, 2008. http://www.theses.fr/2008MON20147.
Повний текст джерелаIn this thesis we have developed 4 original methods based on using catalyst of iron and / or copper. In particular, we discovered a co-catalyst systeme for the arylation of different nucleophiles (oxygen, carbon or nitrogen) from aromatic halides. We have also accheved the arylation of phenol in the presence of a catalytic amont of copper, with non-activated aromatic chlorides, or in the presence of an iron catalyst, with non-activated aromatic iodides. Finally we developed a very simple and efficient catalytic system allowing the synthesis of aniline and its derivatives from ammonia, using a simple copper catalyst
Labaki, Madona. "Étude de l'oxydation totale du propène sur des catalyseurs à base de zirconium modifiés par l'ajout du cuivre et/ou de l'yttrium." Littoral, 2002. http://www.theses.fr/2002DUNK0082.
Повний текст джерелаCopper was introduced into zirconia by coprecipitation and impregnation methods. These samples were tested towards total propene oxidation reaction. Copper promotes the catalytic activity and the selectivity of the reaction towards CO2 formation. The characterization of the catalysts after the catalytic test showed a decrease of the specific area due to a sintering. This sintering transforms, on the surface, the stabilized tetragonal phase of zirconia into a monoclinic one in the case of the samples coprecipitated and impregnated with copper over oxyhydroxide (EPR measurements). Yttrium was introduced into zirconia (1; 5 and 10% mol. Y) in order to stabilize its metastable tetragonal phase. The mixed oxides were more active than zirconia. The best activity of the sample with 5% yttrium compared to the other mixed oxides was correlated to its greater number of Zr3+ defects. Copper impregnated over these oxides leads to a synergy effect between the supports and the active phase (copper) because the sample Cu/ZrO2 doped with 5% yttrium is the most active. Thus, a redox mechanism was proposed to explain the difference of activity
Pruvost-Bonnaillie, Claire. "Etude de la combustion catalytique de particules carbonées sur des systèmes oxydes : CeO2, ZrO2, TiO2 et Al2O3, promus ou non par des ajouts d'ions Cu2+ et/ou K+." Littoral, 2001. http://www.theses.fr/2001DUNK0077.
Повний текст джерелаAssalit, Aurélie. "Nouveaux auxiliaires chiraux à motif sucre : application à la fluoration asymétrique électrophile." Lyon 1, 2008. http://www.theses.fr/2008LYO10168.
Повний текст джерелаDue to their unique properties, asymmetric fluorinated compounds have been found to be potent templates in both the agrochemical and pharmaceutical industries. A large variety of strategies have been thus developed in the last few years for enantioselective fluorination, using chiral fluorinating agents, catalysts. Carbohydrates as natural bio-ressources tend to be remarkable chiral auxiliaries and ligands offering readily available, naturally enriched templates. Therefore, their conversion into N-fluoro chiral agents has been attempted but led to instable compounds. New chiral 2,2’-bipyridines substituted by carbohydrate moieties were also synthesised and considered as ligands for Cu(II). The resultant complexes have been utilised with N-fluorobenzenesulfonimide as fluorinating agent to achieve encouraging results in the asymmetric fluorination of β-ketoesters
Toummini, Dounia. "Arylation de nucléophiles, par catalyse au cuivre ou au fer, ou en milieu superbasique en absence de métal de transition." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2014. http://www.theses.fr/2014ENCM0001.
Повний текст джерелаThis thesis is part of a very general search for new synthetic eco-friendly methods.In the first part, entitled "Arylation catalyzed by copper nitrate salts aryldiazonium heterocycles", we present our work describing the first example of a Sandmeyer reaction type allowing the formation of a carbon-nitrogen bond (C-N). Our systems can, indeed, arylate nitrogen nucleophiles, essentially pyrazole, from aryldiazoniums electrophiles. The patterns obtained, the arylpyrazoles, are extremely common in the field of life and also in materials. The experimental procedures we use are extremely mild, as they involve only catalytic amounts of copper and acetic acid. Furthermore, this system operates at room temperature without the presence of ligand, base or additive. As a side product of the reaction, nitrogen (N2) is released into the medium but without impacting on the inert atmosphere of the reaction. In the second part, entitled "Synthesis of symmetrical biaryls from aryllithiens in the presence of an iron catalyst", we describe a new iron catalytic system that allows the direct synthesis of symmetrical biaryl derivatives from arylithiens, generated in situ from aryl halides under very mild temperature conditions, using an iron catalyst system in the absence of ligands. The procedure which takes place via an in situ quantitatively generated aryl halide with alkyllithiums exchange, provides an excellent control of reactivity and selectivity.Finally, in the last section entitled "Direct Synthesis of biarylmethanes without a transition metal", we demonstrate a new method for the synthesis of unsymmetrical biarylmethanes in a super basic medium of benzyl ketones, with enolizable iodinated aromatic compounds. Under these conditions, the presence of a metal catalyst is not necessary. The molecules obtained have a strong interest in the pharmaceutical field and in materials
Vol, Stanislas. "Echange d'halogènes entre composés aromatiques en présence de catalyseurs cuivre-zéolithes." Poitiers, 1997. http://www.theses.fr/1997POIT2373.
Повний текст джерелаCourtois, Xavier. "Préparation, caractérisation et activité en catalyse trois-voies automobile de catalyseurs cuivre-rhodium supportés." Lyon 1, 2000. http://www.theses.fr/2000LYO10258.
Повний текст джерелаIssenhuth, Jean-Thomas. "Catalyse énantiosélective et polymérisation : Etude de la réactivité de complexes de cuivre et d'aluminium." Université Louis Pasteur (Strasbourg) (1971-2008), 2008. https://publication-theses.unistra.fr/public/theses_doctorat/2008/ISSENHUTH_Jean-Thomas_2008.pdf.
Повний текст джерелаToumi, Mathieu. "Utilisation de la catalyse au cuivre (I) en synthèse totale : synthèse d’alcaloïdes cyclopeptidiques et la chaetominine." Versailles-St Quentin en Yvelines, 2008. http://www.theses.fr/2008VERS0054.
Повний текст джерелаThis thesis focuses on copper-catalysed reactions that have been used in the preparation of several natural products : the paliurines E and F, ziziphines N and Q, abyssenine A, mucronine E and chaetominine. During the synthesis of various cyclopeptide alkaloids, this type of reaction was used in the arylation of a functionalized alcohol and in the intramolecular vinylation reaction of an amide. This efficient strategy allowed us to prepare thirteen- and fifteen-membered ring macrocycles. In a similar way, the copper catalysed intramolecular amidation of an iodinated derivative of tryptophan led to a pyrido-indole type tricyclic structure which was used in the synthesis of (-)-chaetominine. In addition, a reaction pathway to enantiopure 3-hydroxy-pyrrolidines, piperidines or azepanes in four or five steps was developed, using commercially available amino acids as the chiral source, and this method was applied to the synthesis of (-)-bulgecinine
Branco, Joaquim Miguel Badalo. "Contribution à la valorisation de composés intermétalliques nickel- et cuivre-terres rares en catalyse d'hydrogénation." Toulouse 3, 1994. http://www.theses.fr/1994TOU30094.
Повний текст джерелаLefèvre, Guillaume. "Etude mécanistique de réactions de couplage catalysées par des complexes du cuivre et du fer." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00833319.
Повний текст джерелаValange, Sabine. "Préparation et caractérisation de solides micro- et mésoporeux à base de cuivre et de zinc et leur valorisation en catalyse hétérogène." Mulhouse, 2000. http://www.theses.fr/2000MULH0602.
Повний текст джерелаNitelet, Antoine. "Développement de nouveaux procédés cupro-catalysés à partir d'alcènes halogénés: réaction de Finkelstein et alcénylation de cyanamides." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/262142.
Повний текст джерелаDoctorat en Sciences
info:eu-repo/semantics/nonPublished
Tachon, Denis. "Catalyseurs et mécanismes d'élimination des oxydes d'azote en milieu oxydant." Montpellier 2, 1994. http://www.theses.fr/1994MON20162.
Повний текст джерелаBechara, Rafeh. "L'ion Cu+ dans différentes matrices : aspects physico-chimiques et catalytiques." Lille 1, 1986. http://www.theses.fr/1986LIL10037.
Повний текст джерелаRix, Diane. "Développement de pré-catalyseurs de type hoveyda-grubbs activés et recyclables pour la métathèse d’oléfines : synthèse de carbènes N-Hétérocylciques chiraux et utilisation en catalyse asymétrique." Rennes 1, 2008. http://www.theses.fr/2008REN1S068.
Повний текст джерелаThis work deals with the development of new catalytic systems. In a first part, new ruthenium-based precatalysts have been developped for olefin metathesis. Depending on the nature of the spacer allowing the immobilization on a support, catalytic activity and recyclability can be controled while generating low contamination in the products. In a second part, new N-heterocyclic carbenes have been studied for copper-catalysed asymetric conjugate addition. A study of the differents groups of these ligands was done to determine their importance for reactivity and selectivity of this reaction
Didier, Dorian. "Recyclage de complexes bis(oxazolines)- cuivre chiraux pour la catalyse asymétrique : hétérogénéisation par interactions non-covalentes." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00856579.
Повний текст джерелаCHEMIN, DENIS. "Reactivite de chloroalcenes par catalyse multi-etapes palladium, cuivre. Nouvelles syntheses de metabolites de l'acide arachidonique." Paris 11, 1991. http://www.theses.fr/1991PA112130.
Повний текст джерелаFrançais, Antoine. "Protection régiosélective de monosaccharides par catalyse tandem : vers la synthèse de béta-1,2-glucanes." Paris 11, 2007. http://www.theses.fr/2007PA112216.
Повний текст джерелаIn the chemical synthesis of oligosaccharides, the stereoselective formation of glycosidic bonds often represents the major challenge. The monomeric building blocks need however to be synthesized first, frequently requiring a long and multistep sequence. To avoid this multistep approach, we have developed a new methodology for the regioselective one-pot preparation of various derivatives of 3-O-benzyl-D-glucopyranosides. These compounds have been synthesized via a reductive etherification catalyzed by copper (II) triflate from the persilylated derivatives in good yields. This tandem process has been extended to acylation reactions to provide fully orthogonally protected carbohydrates. The regioselective ring opening of the 4,6-benzylidene motif has also been examined in a multicatalytic process. This methodology allows a fast one-pot synthesis of compounds, which can be used in oligosaccharide synthesis. The glycosylation reactions following Crich’s procedure were efficient with the synthesis of a pentasaccharide in good yield. This procedure was then been to the synthesis of linear beta-1,2-glucans. The convergent route led unexpectedly and exclusively to the stereoselective synthesis of alpha-linked trisaccharides. A linear approach, in which monomeric building blocks were obtained in good yields and in a few steps using our methodology, was rather applied and the first coupling reactions are reported in this work
Jarrige, Lucie. "Nouvelles méthodes de synthèse et de fonctionnalisation d'hétérocycles par catalyse photorédox et organocatalyse." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS215.
Повний текст джерелаHeterocycles are one of the most important classes of chemical compounds. These structural scaffolds are the key elements of a wide range of natural products with biological or therapeutic activities. As a result, a great deal of research carried out in chemistry is devoted to development of new heterocycle synthesis methods. With a desire to further reduce the environmental footprint of our research, our laboratory aims to develop new methodologies for effective synthesis, more green and environmentally friendly. Thus, my thesis works lie on two themes widely studied in our laboratory that are photoredox catalysis and organocatalysis. In the first part, the use of photoredox catalysis as an efficient tool for the synthesis and functionalization of heterocycles is detailed. Original heterocyclic units have thus been prepared in good yields and under mild reaction conditions. The second part is devoted to the synthesis of enantioenriched nitrogen-containing heterocycles through organocatalyzed enantioselective inverse electron-demand aza-Diels-Alder reactions. Indeed, the increasing demand of optically pure compounds by the chemical and pharmaceutical industry explains the strong craze for the development of asymmetric synthesis methods. Thus, the developed processes provide new access routes to complex chiral heterocyclic structures with excellent results in terms of efficiency as well as stereoselectivity
Maunoury, Thibault. "Nouveaux ligands issus de dianhydrohexitols : évaluation en catalyse organométallique pour le couplage biarylique atroposélectif." Thesis, Le Mans, 2013. http://www.theses.fr/2013LEMA1026/document.
Повний текст джерелаChiral biarylic paterns are present in severalnatural products or in compounds present biologicalproperties. This type of compounds was also used inasymmetric catalysis.This work is based on the developpement ofnew ligands from biomass mainly from twodianhydrohexitols, isomannide and isoidide, and theirevaluation in atroposelective coupling of birayliccompounds.Two families of diamine ligands were formed.They belong to isoidide series or isomannide series,where the two substituants are respectively in exocyclicand in endocylic position.These compounds were used as copper (I)ligands for oxidative coupling of biarylic compounds(coupling of 2-naphtol and methyl 2-hydroxy-3-naphtoate).During BINOL formation, a maximumenantiomeric excess of 15% was observed in thepresence of copper iodide. With methyl 2-hydroxy-3-naphtoate in the presence of copper chloride, 69% ofenantiomeric excess and 76% of yield were observed.With ligands from isoidide series, yields are weak andthe excess does not exceed 15% for the last substrate.This behavior could be explained by the formation of acopper complex with a bidentate ligand. This complexcan be formed only in isomannide series; the distancebetween the two primary amines, calculated withSPARTAN software, was found around 4.9 Å forisomannide series and 5.9 Å for isoidide series. Thebest conditions were involved in the study ofhomocoupling of naphtoic 2-hydroxyesters and crosscoupling.In addition to this work, a preliminary study ofthe Suzuki coupling involving phosphorous ligandspresenting a single tetrahydrofuranic ring or keepingbicycle of dianhydrohexitol structures along withdinitrogen ligands were evluated