Dissertations / Theses on the topic 'Chimie des composés hétérocycliques'
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Dittoo, Aurélia. "Synthèse de composés hétérocycliques oxygénés et aminés." Paris 6, 2010. http://www.theses.fr/2010PA066747.
Full textNyffenegger, Coralie. "Synthèse de tricycles énergétiques : nouvelles structures azahétérocycliques condensées." Orléans, 2008. http://www.theses.fr/2008ORLE2033.
Full textCren-Olivé, Cécile. "Synthèse, physico-chimie et analyse de flavan-3-ols." Lille 1, 2001. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2001/50376-2001-67.pdf.
Full textBeauchard, Anne. "Synthèse de composés hétérocycliques à visée anti-cancéreuse." La Rochelle, 2006. http://www.theses.fr/2006LAROS175.
Full textIn an effort to develope new inhibitors of kinases as anticancer agents, we synthetized original indirubins and azaindirubins substituted in position 5, 5’, 6 and 7. Because of the poor water solubility and low bioavailability, monoxime analogs were also prepared. The effect on cyclin dependant kinase, glycogene synthase kinase-3 and on the survival of human neuroblastoma SH-SY5Y cells were estimated. On the other hand, we synthetized thiazoloindolo[3,2-c]quinolin which are closed to natural alcaloid. We reinvestigated the Graebe-Ullmann condensation under micro-wave. A new scaffold 7H-4,5-diaza-benzo[de]anthracen which is structurally closed to dercitin, a marine alkaloid, was identified. The effect on breast cancers cells, potential DNA intercalating and topoisomerase inhibition were also discussed
Fante, Bamba. "Nouvelles synthèses hétérocycliques en milieu superacide." Poitiers, 2007. http://www.theses.fr/2007POIT2269.
Full textWhen dissolved in trifluoromethanesulfonic acid, nitroenamines led to conjugated hydroxynitrilium ions after multiple protonation/deshydratation. Such intermediates reacted as soon as they were formed by mean of an electrophilic aromatic substitution to afford oximes derivatives. Furthermore, hydroxynitrilium ions could also be deprotonated to give nitriles oxides which led subsequently to the formation of isoxazolines derivatives via an intramolecular cycloaddition. This reactivity of nitroenamines in triflic acid as been extended to 2-nitroacetamides derivatives. In summary, this study demonstrated a new method to synthesis divers heterocycles which haven’t been described yet and may open a new door for biological investigations of such derivatives
Horeau, Maxime. "Synthèse de dérivés poly-aza-hétérocycliques pour une application en chimie supramoléculaire." Nantes, 2015. http://archive.bu.univ-nantes.fr/pollux/show.action?id=6b0d83b1-eafe-434b-8763-58a9aa87721f.
Full textAza-aromatic oligoamide foldamers self-organise in helical structures and can find an application in the field of molecular recognition. Single-stranded helices with a wide diameter at their centre and a shortened diameter at their extremities define a central cavity isolated from external medium and covered with hydrogen bonding acceptors and donors, which allow guest molecules to be encapsulated. This thesis aim at the elaboration of original foldamers whose helical structure, required for molecular recognition, will be induced through metal coordination. This conformational change is based on the presence of a carefully designed central linker that acts as a molecular hinge. The key linker studied in this work is a pyridazinepyridine-pyridazine compound introduced in two oligoamide sequences in order to generate two model foldamers. After the description of the synthesis of these targets, their complexation to several metals has been studied. The concept of molecular hinge, allowing to induce the helical structure in a totally controlled manner, has been validated. In order to conclude this work, an encapsulation study of several guest molecules has been conducted on this new generation of foldamer. Another aspect addressed in this thesis is the design and the synthesis of a high molecular weight foldamer, spontaneously helically folded, and possessing an enlarged cavity to anticipate the encapsulation of large substrates
Salomon, Pierre. "Application de la chimie radicalaire des xanthates pour la synthèse de molécules organo-fluorées." Palaiseau, Ecole polytechnique, 2014. https://tel.archives-ouvertes.fr/tel-01076540/document.
Full textThis PHD thesis is divided in four chapters. The first bibliographic chapter presents the general principles of radical chemistry, the possibility offered by the xanthate radical chemistry and some general aspects of fluorine chemistry, main focus of this work. The second chapter is dedicated to the synthesis of highly functionnalized gem difluoro olefins. The method, involving three different steps, allow the transformation of a terminal alkene into a gem difluoro terminal alkene, with two new carbon atoms on the chain. The third chapter presents an original synthesis of a new family of organofluorine compounds : difluorothiochromans. This method relies on the use of a new fluorinated xanthate, whose synthesis is also presented. The latter may also be used for the preparation of gem difluoro olefins. Finally, the last chapter describes the synthesis and the use of a new precursor of chlorodifluoromethyl radicals. The synthesis of gem difluoro olefins, gem difluoro dienes and fluorinated heterocycles using this new precursor are discussed
Henry, Laurence. "Synthèse et activité pharmacologique d'indoloquinolizinones." Montpellier 1, 1997. http://www.theses.fr/1997MON13515.
Full textBillet, Manuella. "Préparation d'amines homoallyliques par une réaction à trois composés : application à la synthèse d'hétérocycles azotés." Université Louis Pasteur (Strasbourg) (1971-2008), 2001. http://www.theses.fr/2001STR13074.
Full textHervé, Grégoire. "Progrès récents dans la chimie des molécules énergétiques : accès à de nouveaux hétérocycles azotés aromatiques très performants." Aix-Marseille 3, 2009. http://www.theses.fr/2009AIX30031.
Full textThe purpose of this thesis work was to design and to prepare new stable, highly-energetic and insensitive (or low-sensitive at least) explosives by the means of economical and industrial synthetic pathways. The synthesis of certain aromatic energetic compounds prepared in this framework affords significant enhancement in terms of energetic and physical properties ensuring ease of utilization and handling of such new materials in respect with high energetic performance. Several explosives exhibit unprecedented properties and offer a remarkable performance/sensitivity balance. A novel fully C-nitrated aromatic explosive is presented here and has, by far, the most important thermal and chemical stability in these series versus all the known nitrocarbons (i. E. Hexanitrobenzene) and nitroazoles
Reix, Thierry. "Chimie du diméthyldioxirane : oxydation cyclisante d'amines alléniques et oxydation d'amines primaires." Lyon 1, 1993. http://www.theses.fr/1993LYO10105.
Full textOrtega, Esteban. "Synthèse, comportement dynamique et réactivité de nouveaux thiazirconacycles." Dijon, 2003. http://www.theses.fr/2003DIJOS050.
Full textGeffroy, Guillaume. "Synthèse d'analogues de produits naturels par réactions de Diels-Adler hétéroatomiques." Mulhouse, 1987. http://www.theses.fr/1987MULH0060.
Full textMorvan, Didier. "Synthèses de sels d'imidazolium fonctionnalisés précurseurs de carbènes N-hétérocycliques et applications en chimie organométallique." Brest, 2007. http://www.theses.fr/2007BRES2020.
Full textImidazolium salts have singular chemical properties and are widely used in organic or organometallic chemistry. This organic salt which has been employed as an excellent Nheterocyclic carbene (NHC) precursor. N-Heterocyclic carbene ligands are widely used in organometallic chemistry for its well-known σ-donor properties and interestingly the incorporation of functionality is possible on the nitrogen atoms. In the first part of my PhD thesis, we developed, following a methodologic approach, the synthesis of functionalised imidazolium salts. New methods or simplified methods have been identified to produce imidazolium salts with a wide range of fonctions. The second aspect of this PhD thesis, has concern the exploration of the coordination properties of the new functionalised imidazolium salt, to design models of hydrogenase (hydrogenases are metalloenzymes that catalyze the reduction of protons to dihydrogen at very high rates) and to study the hemilability of these new ligands on rhodium complexes
Loidreau, Yvonnick. "Synthèse de composés hétérocycliques [6,5,6] polyhétéroatomiques, inhibiteurs potentiels de kinases." Rouen, 2013. http://www.theses.fr/2013ROUES001.
Full textIn this manuscript, we describe the design, synthesis and potential applications of a combinatorial library based on polyheteroatomic [6,5,6] planar tricyclic structure. Initially, a study of different synthetic ways to bicyclic [6,5] precursors was carried out. Upon completion of these scaffolds, the third heterocycle was generated by using decomposition of formamide or from the Dimroth rearrangement. More than one hundred molecules were obtained following this work. The products of this library were screened on seven families of kinases (CDK-5, GSK-3, CK-1, DYRK-1A, CK-1, EGF-R and VEGF-R) in order to determine a lead compound 87 (0. 031 nM on CK-1 and 0. 68 microM on CLK-1). A last study consisted in modulating this compound by Suzuki cross-coupling. Finally, more than two hundred molecules were synthetized and this project opens various pharmacological perspectives
Pigeon, Pascal. "Phtalimidométhylthiophènes comme précurseurs de composés polycycliques comportant les motifs isoindole et thiophène." Le Havre, 1996. http://www.theses.fr/1996LEHA0004.
Full textLepifre, Franck. "Elaboration et évaluation des propriétés biologiques de différents systèmes hétérocycliques oxygénés et azotés." Orléans, 2002. http://www.theses.fr/2002ORLE2038.
Full textFayn, Joël. "Synthèse d'hétérocycles f-alkyles par cyclo addition dipolaire-1,3." Nice, 1986. http://www.theses.fr/1986NICE4042.
Full textBlanchard, Stéphanie. "Synthèse d'hétérocycles via les hétarynes : fonctionnalisation et pharmacomodulation des dihydrodipyridopyrazines." Orléans, 2001. http://www.theses.fr/2001ORLE2008.
Full textBourg, Jean-Baptiste. "Etude des diradicaux hétérocycliques." Toulouse 3, 2007. http://www.theses.fr/2007TOU30049.
Full textDiradicals are known to be highly unstable molecules. For example, triplet 1,3-cyclobutanediyls can only be observed in matrices at very low temperature, whilst the corresponding singlet diradicals, formally resulting from the homolytic cleavage of the bridging s-bond, are predicted only as transition states for the inversion of the corresponding bicylo[1. 0. 0]butanes. The first part of this manuscript is devoted to the study of diradicals based on main group elements. The first chapter is a literature survey, which underlines the role of heteroelements in the isolation of the first stable localized singlet diradical. The framework of the latter is formed only of boron and phosphorus atoms. The second chapter focuses on the different isomers of this diradical, and especially its valence isomers. After an introduction to the theoretical concepts, the factors allowing the stabilization of the already known isomers are discussed, and the isolation of new isomers is described. .
Cochet, Thomas. "Valorisation de la saccharine et synthèses d'hétérocycles." Paris 6, 2012. http://www.theses.fr/2012PA066697.
Full textThe original subject of this thesis was the use of saccharin, a cheap artificial sweetener, as a substrate for organic synthesis and as peptide synthesis agent. We have developed the following sequence: N acylation of saccharin by an aminoacid/ring-enlargement/N-alkylation of the formed ring to achieve the synthesis of 9-membered cycles. In this study, the weakness of the exocyclic N-CO bond of N-acylated saccharins was a major problem. Therefore we decided to take advantage of this observation and we realized the chemoselective transfer of the formyl group of the N formylsaccharine to primary amines, secondary amines and to the nitrogen atom of amino alcohols by a simple, fast and smooth reaction. Parallel to this work we were interested in the synthesis of oxygen and nitrogen heterocycles by two different methods catalyzed by transition metals. The first method involves a tandem cross-metathesis/1,4 addition process between an γ,δ unsaturated β ketophosphonate and an ω unsaturated alcohol or an ω-unsaturated amine to obtain functionnalized tetrahydrofurans, tetrahydropyrans and pyrrolidines that could be easily further fonctionnalized by a consecutive HWE reaction. The second method developed is an intramolecular amination of allylic C-H bonds catalyzed by a rhodium(III) complex giving access to 2 vinylpyrrolidines and 2-vinylpiperidines. This reaction represents one of the rare examples of allylic C-H bond amination by monoactivated ω-unsaturated amines
Charton, Isabelle. "Hétérocycles oxygénés et analogues soufres : synthèse et activité biologique en tant que ligands mélatoninergiques." Orléans, 2000. http://www.theses.fr/2000ORLE2035.
Full textCornet, Hélène. "Nouveau principe d'élaboration de charpentes hétérobicycliques : applications et développements." Lille 1, 1992. http://www.theses.fr/1992LIL10125.
Full textFuks, Gad. "Etude des diradicaux singulets hétérocycliques." Toulouse 3, 2007. http://thesesups.ups-tlse.fr/71/.
Full textDiradicals are reputed to be very unstable. For instance, the cyclobutanediyl which is an archetypal organic diradical has been stabilized only in matrixes at low temperature. This study is concerned with the design of singlet diradicals based on phosphorus and boron. In the first chapter, we will show in a bibliographic introduction how the use of heteroelements allowed the isolation of the first localized singlet diradical indefinitely stable at room temperature with a skeleton based on boron and phosphorus. In a second chapter, we will study the influence of the substituents beared by the atoms of boron and phosphorus. After a study of different models already known, we will describe the synthesis of an unsymmetrical model on boron. We will see that this model displayed an unexpected behaviour. In a third chapter, we will study the catenation of diradicals. We will examine different models already synthesized in our group and we will see how the study on the influence of the substituents helped us to understand the phenomena observed with tetraradicals. We will also see the synthesis of new models of tetraradicals. Finally, in the fourth chapter, we will focus on the reactivity of diradicals. We will see that diradicals feature a radical-type reactivity especially when it comes to initiating polymerizations. Then, we will study the electrophilic 1,3 additions of Brönsted acids on diradicals. This last study was carried out by a combination of experimental and computational methods in collaboration with Dr. Laurent Maron of the “Laboratoire de physique quantique”
Paugam, Mikaël. "Synthèse de récepteurs de molécules aromatiques π-déficitaires. Etude des systèmes hôte-invité par interactions aromatiques : application au renforcement de la chimioséléctivité de la réaction par métallation". Rouen, INSA, 2001. http://www.theses.fr/2001ISAM0002.
Full textArfan, Atef. "Synthèse et réactivité de liquides ioniques en synthèse organique : applications en catalyse et en chimie hétérocyclique." Rennes 1, 2006. http://www.theses.fr/2006REN1S028.
Full textPiacenza, Guy. "Nouveaux matériaux énergétiques, modélisation et préparation de polyamines hétérocycliques." Aix-Marseille 3, 1997. http://www.theses.fr/1997AIX30081.
Full textRigal, Luc. "Matière végétale et chimie fine : synthèse de l'hydroxyméthyl-5 furanne carboxaldéhyde-2." Toulouse, INPT, 1987. http://www.theses.fr/1987INPT038G.
Full textBusch, Alexandrine. "Synthèse de dérivés de benzo- et pyridodiazines à propriétés optiques non linéaires potentielles." Rouen, INSA, 2005. http://www.theses.fr/2005ISAM0004.
Full textKizilian, Elyane. "Complexation et transferts protoniques au sein de motifs superélectrophiles aromatiques et hétéroaromatiques." Versailles-St Quentin en Yvelines, 2000. http://www.theses.fr/2000VERS0021.
Full textHernandez, Torres Carmen. "Tetrahidrofuranos y cromanos a partir de sulfoxidos : Aplicacion a la sintesis total del (+)-(2R,3S,4S,5S)-goniotalesdiol y del (+)-(S,R,R,R)-nebivolol." Strasbourg 1, 2008. http://www.theses.fr/2008STR13068.
Full textWe extend the scope of the methodology already described in our group, based on the asymmetric approach to different sized cis-disubstituted cyclic ethers mediated by sulfoxides, to the efficient construction of a natural product, the (+)-goniothalesdiol, bearing a tetrasubstituted tetrahydrofuran structure and four stereogenic centers. The stereoselective total synthesis of natural (+)-goniothalesdiol that we are reporting proceeds in a 9-step reaction sequence from commercially available (-)-dimethyl D-tartrate and 5% overall yield. It exploits the diastereoselective reduction of a -ketosulfoxide and a cis-stereoselective Et3SiH/TMSOTf-promoted reductive cyclization/deoxygenation to generate, respectively, the stereogenic centers at C-5 and C-2 of the tetrahydrofuran ring. In the second part of this work, we describe a novel enantioselective access to the hydrobenzopyran moiety (chromans), a structural component of several natural products and pharmaceuticals, based on the direct transformation of enantiopure 4-(2-hydroxyphenyl)-1-(p-tolylsulfinyl)-2-butanone into sulfinyl 2 or 2,2-substituted chromans, with a defined stereochemistry at the C-2 tertiary or quaternary stereogenic center in which the homochiral sulfoxide would be solely responsible for the diastereoselectivity of the reaction. This new methodology was applied in a short and convergent enantioselective synthesis of the (S,R,R,R)-nebivolol, a known antihypertensive drug currently in clinical use. Thus, the (+)-nebivolol was prepared in 9 steps for the longest linear sequence, with 11. 5% overall yield starting from the known 6-fluorochroman-2-one. This is the shortest and the most efficient synthesis described in the literature
Becker, Sandrine. "Activation agrégative : application des réducteurs complexes au nickel dans les réactions de désulfuration." Nancy 1, 1991. http://docnum.univ-lorraine.fr/public/SCD_T_1991_0150_BECKER.pdf.
Full textPierre, Francis. "Recherches dans le domaine de la synthèse du méthoxy-5 oxo-9 dihydro-7, 8 pyranno [2,3-g] indole et d'analogues." Mulhouse, 1986. http://www.theses.fr/1986MULH0001.
Full textChabane, Hadjila. "Synthèse et évaluation du potentiel anticancéreux d'hétérocycles apparentés aux thiazolocarbazoles." Orléans, 2001. http://www.theses.fr/2001ORLE2065.
Full textDumez, Estelle. "Fonctionnalisation sélective d'oléfines en hétérocycles insaturés." Aix-Marseille 3, 1998. http://www.theses.fr/1998AIX30070.
Full textVarin, Pierre. "Cycloaddition de nitrilimines sur l'acétyl-2 méthyl-5 diazaphosphole-1, 2, 3Suivi de Etude stéréochimique de la réaction de deux mercaptoacétates d'alkyle sur deux chalcones -substitués." Besançon, 1986. http://www.theses.fr/1986BESA2011.
Full textAhari, M'hamed. "Nouvelles synthèses diastéréosélectives d’hétérocycles azotés via la chimie du zirconium." Reims, 2008. http://theses.univ-reims.fr/exl-doc/GED00000977.pdf.
Full textThis thesis deals with a new approach to optically pure nitrogen-containing heterocycles starting from unsaturated amines. This strategy relies upon the generation of an electrophilic site, through a hydrozirconation / iodination sequence performed in the presence of unprotected or latent nucleophilic fragments. In the first part, this approach is applied to secondary homoallylic amines. The electrophilic center is generated in the presence of a reactive amine, thus allowing the spontaneous cyclisation affording optically pure 2-substituted pyrrolidines. The method has been extended to the synthesis of new pyrrolidine-phosphine ligands. These ligands were tested in palladium catalyzed asymmetric allylic alkylation and led to encouraging selectivities. The second part of this work is devoted to the synthesis of 2,3-disubstituted piperidines via the sequential generation of sites of complementary polarity. The electrophilic site is created by chemoselective hydrozirconation / iodination of alkenes in the presence of an ester, followed by the enolate generation to promote the cyclisation. This method is highly diastereoselective and was illustrated by the synthesis of (+)-Epilupinine (a natural alkaloid) and the preparation of an epi-CP-99 994 analogous, a potent substance P inhibitor
Bouda, Hamilton. "Réactions en milieu hétérogène solide-liquide faiblement hydraté : généralisation de la synthèse d'époxydes : synthèse du furyl-2 thiirane et de ses homologues." Toulouse, INPT, 1987. http://www.theses.fr/1987INPT005G.
Full textLutun, Stéphane. "Synthèses d'hétérocycles à l'aide de métaux de transition : préparation d'oxadiazoles : synthèse et utilisation d'un catalyseur supporté." Lille 1, 1997. http://www.theses.fr/1997LIL10072.
Full textMourer, Maxime. "Calixarènes hydrosolubles à propriétés antivirales et antibactériennes." Nancy 1, 2006. http://www.theses.fr/2006NAN10168.
Full textThe present work is integrated in a research dedicated to the role that calixarene macrocycles can play in the medicinal field particulary infectiology, throught their spatial organizing properties for various ionic groups. We have notably targetted the very sensitive virology and bacteriology domains, for which the research and the discovery of new therapeutical approaches and of new lead compounds become crucial. Once designed, according to the inhibition of virus/cell adhesion process or the denaturation of bacterial membrane, we estimate the impact of our compounds, all hydrosoluble, on the main bacterial strains involved in infections, notably the nosocomial ones, and enveloped viruses such as Herpes and virus associated to AIDS, HIV. These water soluble compounds bearing or not heterocyclic groups being always rare, led us to establish a state-of-the-art on the hydrosolubilisation of calixarenes, introduction of nitrogenous heterocycles, as well as their therapeutical implications. In a second part, we present and discuss the synthetic strategies and results obtained with three new anionic or cationic calixarene families. The third part presents the antiviral and antibacterial properties of the above-mentioned compounds. We present the antiviral activities on HSV obtained with previously developed compounds, then their anti-HIV activities and those of compounds prepared during the present work. Finally, we present and discuss the results concerning their antibacterial activities obtained on various Gram+ and Gram- bacterial strains
Voisin-Chiret, Anne-Sophie. "Synthèse de nouveaux dérivés pyridiniques à visée cholinergique nicotinique." Caen, 2005. http://www.theses.fr/2005CAEN4066.
Full textThe present study describes, on the one hand, the synthesis, the physicochemical study and the biological evaluation of novel pyridylethers as potential nicotinic cholinergic receptor ligands. On the other hand, the Petasis reaction, a multicomponent reaction, is used in the pyridine series to synthesize novel complexes. In the first part, after a general review about nicotinic cholinergic receptors, their localization, their structure and their function as well as a description of different technologies used in parallel chemistry, the chemical study is developed. Various synthetic approaches to prepare pyridylethers were used, along with studies on stability and reactivity. A small but diverse chemical library was accomplished. The first biological results are reported. Further tests are currently under investigation. In the second part, after a general review about multicomponent reactions, the Petasis reaction was studied with an emphasis parallelization. The implementation of this reaction allowed us to obtain original compounds whose structure was investigated and determined as complex (1:1) of dioxaborolanone and an amine. The experimental part of this document describes the procedures and the physicochemical characteristics of the compounds presented. Finally, more than 270 bibliographical references replace this study in its chemical and biological context
El, Kazzouli Saïd. "Synthèse de divers hétérocycles sur support polymère à partir d'un synthon commun : élaboration et évaluation pharmacologique de ligands mélatoninergiques à structure imidazo[1,2-a]pyridinique." Orléans, 2004. http://www.theses.fr/2004ORLE2025.
Full textSzabo, Rémi. "Syntèse de nouveaux azahétérocycles par stratégie Srn1 et réaction de couplage de Suzuki." Aix-Marseille 2, 2008. http://www.theses.fr/2008AIX22954.
Full textBoulven, Manon. "Conception, synthèse et évaluation biologique de nouveaux composés hétérocycliques anticoagulants à usage rodonticide." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI106.
Full textTo date, commercial anticoagulants suffer from two major inconveniences: their persistence causing secondary poisoning of rodent predators and the development of many genetic mutations caused by the intensive use of these compounds. As a result, the European Union plans to prohibit the use of such compounds. Consequently, the priority task is to find an anticoagulant that can control the rodent populations without affecting their predators. The research of Dr. Adrien Montagut (PhD, 2011-2014) have led to the structure type of an anticoagulant derived from 4-hydroxycoumarin. Currently, AMR361 was tested in vitro on all VKORC1 mutations and in vivo on wild rats. It is the first AVK developed that responds to all the characteristics of the initial specification. The first part of my PhD was to complete the biological study on 4-hydroxycoumarin core by bringing functional diversity on the para position of the aromatic ring. From a biological point of view, the lengthening of the spacer arm on the side chain by use of various functions or the introduction of a dimethyl group on the methylene bridge were studied in order to analyze the effectiveness and persistence parameters. However, most of the synthesized compounds belonging to the family of 4-hydroxycoumarins are already described in a patent filed by Liphatech company in 1999. The study of new cores which are similar to the 4-hydroxycoumarin or the functionalization of the aromatic part of the 4-hydroxycoumarin has provided access to more diverse structures. These original possibilities for innovation have been introduced to circumvent existing patents
Marrot, Sébastien. "Carbènes N-Hétérocycliques : Des catalyseurs en chimie des silicones. Carbodiphosphoranes cycliques : Synthèse, coordination et réactivité." Phd thesis, Toulouse 3, 2007. http://www.theses.fr/2007TOU30037.
Full textIn a first chapter, we are interested in the use of N-Heterocyclic Carbenes like nucleophilic organic catalysts for ring opening polymerization of octamethylcyclosiloxane and for reactions of polycondensation. In a second chapter, we carry out a bibliographical review on compounds presenting two cumulated ylides functions : carbodiphosphoranes. In a third chapter, we present the synthesis and the coordination of new cyclic carbodiphosphoranes. They are recognized to be strong s-donor ligands for transition metals. In a fourth chapter, we study the thermolysis of one of these compounds which leads by rearrangement to the formation of a 1,2l5-azaphosphète. A theoretical study highlights an inter-conversion between carbodiphosphoranes and disphosphinocarbenes
Zill, Nicolas. "Synthèse d’aza-hétérocycles par hydroformylation." Strasbourg, 2011. http://www.theses.fr/2011STRA6202.
Full textIn response to environmental problems due to chemistry, different concepts rised up like atom and step economy and the domino reaction. The objective of this thesis was the development of new synthetic routes towards natural or synthetic products of therapeutic interest respecting at the same time the previous notions. Hydroformylation, one of the most important reactions of homogeneous catalysis, matches the atom economy criterion but it especially allows the realization of chemical constructions initiated by a domino reaction which is a natural way to decrease the number of steps of a reactive pathway. This reaction is a conversion of an olefin into an aldehyde in the presence of a transition metal under a pressure of carbon monoxide and hydrogen. Firstly, hydroformylation allowed the synthesis of oxazolo-pyrrolidine, -piperidine and –azepine patterns by a domino reaction involving amino-alcohols and halogeno-alkenes. These nitrogen bicycles are precious for the preparation of chiral heterocycles after simple chemical transformations onto an aminal function. Another method to prepare in a stereoselective manner these compounds was to use functionalized homoallylamine derivatives using a metallic allylation on oxazolidines followed by a hydroformylation. To prove the efficiency of our strategy, natural products like coniine and solenopsine were synthesized. Finally, hydroformylation of 1,2-disubstituted olefins was under investigation in order to open a route to highly stereoselective C-3 pyrrolidines and piperidines which are excellent drug precursors. The elaboration of functionalized nitrogen heterocycles by domino reaction initiated by hydroformylation seems to be a promising and quick method to synthesize chemical entities of biological interest
Dion, Dorothée. "Etude du mécanisme de la réduction électrochimique de l'isonicotinamide et de ses derivés." Dijon, 1997. http://www.theses.fr/1997DIJOS040.
Full textLegeay, Jean-Christophe. "Synthèses multicomposantes et multiétapes supportées sur phases liquides ioniques : application aux réactions de Hantzsch et de Biginelli." Rennes 1, 2006. http://www.theses.fr/2006REN1S055.
Full textHinsinger, Karen. "Synthèse de glyco-ynithols et d’alpha-hydroxyallènes : étude de leurs cyclisations intramoléculaires pour l’accès à des structures polyfonctionnalisées." Amiens, 2010. http://www.theses.fr/2010AMIE0115.
Full textThe aim of this project was the synthesis of polyhydroxylated bicyclic heterocycles by intramolecular cyclisation of chiral acyclic alkynes, named glyco-ynitols. After having prepared these intermediates via regioselective transformation of monosaccharides, we firstly studied 1,3-dipolar cycloadditions in order to obtain pyrrolidine, pyrazoline and pyrazole compounds. Then, a hetero-Pauson-Khand reaction yielded butenolides. We also looked into the synthesis of exocyclic alpha-hydroxyallenes. Consequently we tested different cyclisation conditions of glyco-ynitols with Bronsted and Lewis acids. Afterwards, gold(III)-catalyzed cycloisomerisation of the obtained allenes was realized to yield 2,5-dihydrofuran bicycles
Boeglin, Joel. "Diversification du châssis 1,3,5-triazépane-2,6-dione par synthèse combinatoire : Application à la recherche d’inhibiteurs de phospholipases A2 sécrétées." Strasbourg, 2010. http://www.theses.fr/2010STRA6094.
Full textThe new high throughput screening methods operated by the pharmaceutical industry has increased the demand for new substances to be tested, resulting in a rise of synthetic methods aimed at generating diversity-oriented combinatorial libraries. In this context, dipeptide-derived heterocycles are of particular interest because they take advantage of both the chemical diversity of aminoacids and the conformational rigidity of heterocyclic scaffolds to distribute pharmacophores in the 3D space. The 1,3,5-triazepane-2,6-diones developed in the laboratory are heterocycles obtained in 4 steps by cyclization of an activated dipeptide derivative carbamate precursor. These 7-membered cycles with an amide and a urea function that can be readily modified post-cyclization by alkylation or acylation of urea moiety nitrogen or by thionation of carbonyl groups around the ring. These methods have allowed the introduction of additional side chains bearing reactive functions that have been transformed to prepare biologically active compounds. To increase the diversity of the chemical library of triazepanediones, we developed 2 methods of scaffold synthesis on solid phase applicable in parallel synthesis. In vitro tests on HGV- and HGX-sPLA2s have allowed the identification of new inhibitors in the µM range. Results of co-crystallization with one inhibitor and hGX-sPLA2 suggest for the first time that it may be possible to use a structure-based design approach to further optimize these first hits