Thèses sur le sujet « Synthèse peptique »
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Fruchart-Gaillard, Carole. « Caractérisation pharmacologique et structurale de l'interaction de neurotoxines sur des récepteurs cholinergiques ». Paris 6, 2003. http://www.theses.fr/2003PA066124.
Texte intégralTroalen, Frédéric. « Utilisation de la synthèse peptidique en immunochimie : application à l'étude de protéines présentant différents niveaux d'organisation structurale ». Paris 5, 1989. http://www.theses.fr/1989PA05P618.
Texte intégralPetit, Sylvain. « Réduction de pyridines pour la synthèse de Building-Blocks chiraux : peptidomimétiques de type imidazolique : synthèse et application à la synthèse d'analogues d'intérêt ». Phd thesis, INSA de Rouen, 2010. http://tel.archives-ouvertes.fr/tel-00581586.
Texte intégralZerkout, Saïd. « Synthèse d'hydrazino peptides ». Vandoeuvre-les-Nancy, INPL, 1994. http://www.theses.fr/1994INPL052N.
Texte intégralAbbas-Quinternet, Cécile. « Synthèse et études structurales de nouveaux 2 : 1-[[alpha]/aza]-oligomères, vers de nouveaux foldamères ». Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL055N/document.
Texte intégralFoldamers are described as any oligomers with a strong tendency to adopt a specific compact conformation in solution through non covalent interactions. These compounds can make duplexes with RNA and DNA and are more resistant to peptidases. Thus foldamers can have a biological activity. Among azapseudopeptide oligomers, substitution of a nitrogen for the CHa group is a way to preserve the side chains of analogous peptides. This substitution entails the lost of chiral center and the overall conformational and local electronic states might be affected. We have synthesized 2:1-[a/aza]-oligomers on liquid phase. We have developed a new general protocol for obtaining various Boc-azaAA-AA-OMe. Then, 2:1-[a/aza]-trimers, obtained from the precursors, were used in oligomerization reaction by peptidic coupling. By this way, we obtained the first 2:1-[a/aza]-oligomers in very good yields. The structure of the obtained oligomers was analysed by NMR and IR spectroscopies, X-ray diffraction and molecular modelling. The 2:1-[a/aza]-trimers show a ßII-turn and the 2:1-[a/aza]-hexamers structure themselves. On the whole, by NMR and IR spectroscopies, we can strongly consider that our 2:1-[a/aza]-oligomers structure themselves in solution to form foldamers
Pavlov, Nikola. « Synthèse asymétrique d’analogues de β2-tryptophane et application en synthèse peptidique ». Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20186/document.
Texte intégralTryptophan, an essential amino acid, both functions as a building block in protein biosynthesis and as a biochemical precursor. It is abundantly found in most biologically active peptides that exhibit various physiological properties in particular hormonal and antimicrobial activities. Some of its natural derivatives like serotonin, tryptamine, and also unnatural derivatives such as sumatriptan, have neurophysiologic effects. Tryptophan analogues are also important building blocks for the synthesis of peptidomimetics, natural products and biologically active compounds. Another important property of tryptophan and tryptophan analogues is related to the fluorescence of the indole ring that can be used to study conformational changes in protein and in protein-membrane interactions. The asymmetric Friedel-Crafts alkylation of various indoles with a chiral nitroacrylate provides optically active beta-tryptophan analogues after reduction of the nitro group and removal of the chiral auxiliary. This reaction generally occurs in good yield and high diastereoselectivity (up to 90:10). We have established a new route to prepare enantiopure beta-tryptophan analogues ((S)-2-indolyl-beta-alanines). We showed that beta-nitroacrylate (R)-2 is a good chiral auxiliary for asymmetric Friedel-Crafts alkylation of indoles. (R)-2-indolyl--alanines were obtained by the same synthetic route by using the chiral compound (S)-2. beta-tryptophan analogues are delivered in their N-Fmoc-protected form, ready to use for instance in solid phase peptide synthesis, which is one of the most popular method for peptide synthesis. This study provides a new example of asymmetric beta-tryptophan analogues preparation and further studies concerning their applications in medicinal chemistry and in organic synthesis are now in progress
Attal, Sandra. « Utilisation des enzymes en chimie organique : application à la synthèse d'esters de dipeptides par la papai͏̈ne et de galactosyl-sérines par les α-et β-galactosidases ». Paris 5, 1992. http://www.theses.fr/1992PA05P614.
Texte intégralFritz, Loïc. « Etude de l'activité peptidyl synthétase de la carboxypeptidase Y : influence de la structure primaire du fragment C-terminal du substrat et application au radiomarquage 3H de 3 hormones neurohypophysaires ». Paris 5, 1989. http://www.theses.fr/1989PA05P617.
Texte intégralSimon, Julien. « Etude méthodologique du couplage d’acides aminés trifluorométhylés et application à la synthèse d’analogues du GPE, un tripeptide à visée thérapeutique ». Thesis, Cergy-Pontoise, 2012. http://www.theses.fr/2012CERG0596/document.
Texte intégralGPE is a tripeptide with neuroprotecting activity both in-vitro and in-vivo for various neuronal dammage. The goal of this thesis was to work out peptide coupling methods for trifluoromethylated amino acids and the synthesis of trifluoromethylated analogs of GPE.During this thesis, the synthesis of enantiopure cyclic trifluoromethylated amino acids (proline and pseudoprolines) was performed successfully on grams scale.Then, methodological study of their incorporation in peptide was performed.NMR experiments were made to investigate the cis/trans conformation of the amide bound of trifluoromethylated peptide. At last, analogs of the tripeptide GPE were made with trifluoromethylated proline and pseudoprolines instead of the proline. Biological tests are currently under progress to evaluate their activity on various neuronal disorders
Scornet, Noémie. « Etude de l'allergie aux antibiotiques : synthèse de peptides antigéniques ». Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS032/document.
Texte intégralMany drugs are responsible of allergic reactions, in particular penicillins and sulfonamides. As these antibiotics respond to the hapten theory, they cannot induce the immune system by themselves, but have to bind a protein. These haptenized proteins are detected then digested by antigen presenting cells into peptides which are presented to T cells. These haptenized peptides are responsible of the activation of the immune system in allergic patient. The aim of this study is to select and synthesize immunogenic peptides, modified by selected antibiotics. The human serum albumin (HSA) was chosen as a model protein. It haptenization was studied for three drugs with high allergic prevalence: benzylpenicillin, amoxicillin and sulfamethoxazole. Mass analysis of the resulting bioconjugates HSA-antibiotic allowed identification of haptenized amino-acid which were used to design and select through in silico methods potentially immunogenic 15-mers peptides. The synthesis of these peptides implies the preparation of stable amino-acid-hapten monomers for an oriented synthesis of diversified peptidic sequences. For penicillins, this synthesis was based on a key step: the opening of the penicillins β-lactam ring by a lysine. Regarding the sulfonamide sulfamethoxazole, the synthesis of a stable cysteine-sulfamethoxazole monomer was centered on a coupling key step between the sulfamethoxazole and a cysteic acid. From lysine-benzylpenicillin monomer, peptides have already been synthesized and tested over T cells. Their immunogenic effect and development as tools for diagnosis are being evaluated
Ieronymaki, Matthaia. « Immunological and Conformational characterization of synthetic peptide probes for autoimmune diseases ». Thesis, Cergy-Pontoise, 2016. http://www.theses.fr/2016CERG0831/document.
Texte intégralAutoimmune diseases (ADs) refer to chronic and heterogeneous diseases with acquired immune system’s reactions against the body’s own healthy tissues. ADs affect more than 5% of the population worldwide and especially young adults. The complexity of their spectrum is enormous and even if their etiology is still unclear, it was demonstrated that both genetic and environmental factors are involved in triggering the pathological mechanism. Hence, a reliable diagnostic and/or prognostic tool for an early diagnosis of ADs before irreversible cellular damage occurs and for monitoring their progression is demanded.Numerous studies have revealed the presence of different autoantibodies (auto-Abs) in sera of patients suffering from ADs. Autoantibodies that are specific for a disease can be used as biomarkers (BMs) for its diagnosis while autoantibodies that differ depending on the disease state can be used in the follow up of the patients. Actually, in the case of autoimmunity, an easily detectable and reliable BM may be represented by the titer of a specific auto-Ab.In this context, we aimed to identify target(s) of the response for two different ADs, multiple sclerosis (MS) and monoclonal gammopathy, using the chemical reverse approach, which involves the screening of focused antigen (Ag) libraries with patients’ serum.In particular, the significance of anti-myelin antibodies, and especially, anti- Myelin Oligodendrocyte Glycoprotein (anti-MOG) antibodies is still matter of debate, underscoring the highly controversial issue of a putative pathogenetic role of anti-MOG antibodies in MS. In this thesis we investigated the role of MOG as putative auto-Ag in MS using the experimental autoimmune encephalomyelitis (EAE) model. Moreover, in order to assess the presence of a B-cell epitope spreading mechanism, i.e. the occurrence of a response directed toward epitopes distinct from the disease-inducing agent, we synthesized and tested as antigenic probes also five synthetic peptides covering the 1-117 sequence of MOG.The second issue focused on the selection of a peptide mimicking the minimal epitope recognized by the commercial available monoclonal antibody anti-human natural killer cell-1 (anti-HNK-1) using Surface Plasmon Resonance (SPR) technique. HNK-1 epitope, is considered as the antigenic determinant of myelin-associated glycoprotein (MAG), a quantitatively minor component of myelin sheaths. It is observed that patients affected by autoimmune neurological disorders, such as IgM monoclonal gammopathy and demyelinating polyneuropathy, often develop anti-MAG antibodies specifically targeting the HNK-1 epitope. Accordingly, identification and characterisation of these antibodies is relevant. The selected peptide could be subsequently used in earlier stage patients for the development of a novel and reliable diagnostic tool for anti-HNK-1 antibody identification in sera of patients affected by autoimmune neurological disorders monitoring disease activity
Strauss, Jörg. « Optisch aktive chromophorfunktionalisierte Cyclo- und Hairpinpeptide Synthese, Elektrochemie, Spektroskopie / ». [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964806177.
Texte intégralNguyen, Van Nhien Albert. « Synthèse stéréosélective de glyco-a-aminonitriles et applications en synthèse peptidique et hérérocyclique ». Amiens, 2001. http://www.theses.fr/2001AMIE0004.
Texte intégralHalie, Delphine. « Synthèse diastéréosélective de mimes du peptide RGD ». Paris 5, 2006. http://www.theses.fr/2006PA05P639.
Texte intégralClavé, Guillaume. « Synthèse de nouveaux réactifs hétérotrifonctionnels : application au SPIT-FRI ; synthèse d'analogues des microcystines ». Rouen, 2009. http://www.theses.fr/2009ROUES046.
Texte intégralFranceschini, Nicolas. « Synthèse énantiosélective de motifs rigidificateurs du squelette peptidique ». Amiens, 2004. http://www.theses.fr/2004AMIED003.
Texte intégralIn this manuscript, the enantioselective synthesis of constrained dipeptide analogues to be incorporated in a segetalin is described. We have chosen, as a constraint, a 3-substituted-2-oxopiperazine unit. Insertion of this residue could reinforce the segetalin's anti-angiogenic character. The synthesis of the constrained dipeptide, involved a diastereoselective alkylation of a key-intermediate, prepared from L-serine in 7 steps in 44% yield. In parallel, we worked out a new strategy to access to the thiomorpholin-3-one skeleton. Thus, we prepared some analogues containing this cycle and presenting the necessary functionalities to be aromatase inhibitors. Finally, an efficient asymmetric synthesis of 2-substitued-thiomorpholin-3-ones by stereocontrolled alkylation at the 2-position has been proposed
Beuzelin, Isabelle. « Synthèse peptidique prébiotique à partir de N-carbamoylaminoacides ». Montpellier 2, 1998. http://www.theses.fr/1998MON20206.
Texte intégralCollet, Magalie. « Peptidonucléoside polyoxine J, inhibiteur de la chitine synthase : approches vers la synthèse du nucléoside C2' - désoxy -C2' fluoré, et synthèse de l'acide 5-O-carbamoyle polyoxamique ». Toulouse 3, 2004. http://www.theses.fr/2004TOU30198.
Texte intégralPolyoxins, which form an important class of peptidyl nucleosidic antibiotics that selectively and competitively inhibit chitin synthase, are very active components in vitro, but weakly bioavailable in vivo. The subject of this thesis has been to found new synthetic methods to access to C2'-fluoro-C2'-deoxy analogues of thymine polyoxine C, nucleosidic part of polyoxine J (the more active one), and to obtain, by an original way, the non natural peptidic moiety of polyoxine J, which is the 5-O-carbamoyl polyoxamic acid. After a presentation of the biological target and the interest of the introduction of a fluorine atom, this work is divided into two parts. Fisrt, two approaches of the fluorinated nucleosodic part using 2-deoxy-2-fluorobutyrolactones as intermediates, and then, an optimization of the synthesis of the peptidic part using the formation of an oxazolidonone intermediate
Liu, Yong-Peng. « Total Synthesis of Microsclerodermin D ». Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASF024.
Texte intégralMicrosclerodermin D is a macrocyclic peptide of marine origin which contains six amino acids, of which two are commercially available: glycine (Gly) and sarcosine (Sar). The four other amino acids: (R)-γ-amino-β-hydroxybutyric acid (GABOB), D-6-chlorotryptophan (6-Cl-Trp), a polyhydroxylated β-amino acid (APTO) and 3-amino-4-hydroxypyrrolidinoacetic acid (PyrrAA) will be accessible by new synthetic routes. Our goal is to develop a modular synthetic route to microsclerodermin D that could be applicable for the preparation of other microsclerodermin family members and analogues thereof. We are also looking forward to make some investigations on their biological activities or potential as anticancer drug
Wilking, Sven David. « Synthese und Charakterisierung DNA-bindender Peptide ». [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=981403824.
Texte intégralBiagini, Anne. « Synthèse peptidique catalysée par les protéases en milieu faiblement hydraté ». Aix-Marseille 3, 1990. http://www.theses.fr/1990AIX30074.
Texte intégralBlondelle, Sylvie. « Synthèse peptidique sur polymères carbonylés via les imidazolidinones-4 ». Montpellier 2, 1988. http://www.theses.fr/1988MON20136.
Texte intégralSuppo, Jean-Simon. « Développement d’une nouvelle stratégie pour la synthèse peptidique inversée ». Thesis, Montpellier, Ecole nationale supérieure de chimie, 2015. http://www.theses.fr/2015ENCM0023.
Texte intégralThis manuscript deals with the development of a new inverse peptide synthesis. First, a mild, practical, and simple procedure for peptide-bond formation is reported. Instead of activation of the carboxylic acid functionality, the reaction involves an unprecedented use of activated α-aminoesters. The method provides a straightforward entry to dipeptides and was effective when a sensitive cysteine residue was used, as no epimerization was detected in this case. In a same time, the methodology has proved his efficiency concerning the Anderson’s test. The applicability of this method to iterative peptide synthesis was illustrated by the synthesis of a model tetrapeptide in the challenging reverse NC direction. Finally, the development of a new strategy of protection of carboxylic acid function into silyl esters was described en route to an application in reverse NC direction
Simon, Julien. « Etude méthodologique du couplage d'acides aminés trifluorométhylés et application à la synthèse d'analogues du GPE, un tripeptide à visée thérapeutique ». Phd thesis, Université de Cergy Pontoise, 2012. http://tel.archives-ouvertes.fr/tel-00816535.
Texte intégralPradel, Valérie. « Synthèse d'inhibiteurs de la dipeptidylpeptidase IV ». Paris 5, 1994. http://www.theses.fr/1994PA05P162.
Texte intégralDrouot, Cyrille. « Synthèse combinatoire de pseudopeptides inhibiteurs de l'activité "Bêta" sécrétase impliquée dans la maladie d'Alzheimer. Synthèse en phase solide du peptide amyloi͏̈de 1-42 et d'analogues du peptide intestinal vasoactif ». Montpellier 2, 1998. http://www.theses.fr/1998MON20142.
Texte intégralNiddam, Valérie. « Conception, synthèse et évaluation anti-rétrovirale de dérivés du type peptidique, pseudo-peptidique et hétérocyclique ». Aix-Marseille 2, 1997. http://www.theses.fr/1997AIX22026.
Texte intégralDutheuil, Guillaume. « Peptidomimétiques : vers une double liaison fluoréecomme analogue de la liaison peptidique ». Rouen, INSA, 2006. http://www.theses.fr/2006ISAM0007.
Texte intégralRival, Sandrine. « Synthèse peptidique enzymatique à l'aide de l'élastase de Pseudomonas aeruginosa ». Lyon 1, 1996. http://www.theses.fr/1996LYO10241.
Texte intégralHaltout, Abdelaziz. « La calcitonine de saumon-1 : modèle de différents modes de synthèse peptidique en phase solide ». Paris 12, 1993. http://www.theses.fr/1993PA120042.
Texte intégralMerhi, Ghada. « Synthèse et évaluation de nouveaux muramyl peptides ». Paris 11, 1996. http://www.theses.fr/1996PA114809.
Texte intégralGrand, Vincent. « Synthèse et structure des peptides réduits : influence structurale de l'état aminé ou ammonium du lien amidé réduit ». Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL038N.
Texte intégralBaron, Alice. « Synthèse et Etude d'Analogues Peptidiques en tant qu'Inhibiteurs de Fusion du VIH ». Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20209/document.
Texte intégralSince the discovery of the Human Immunodeficiency Virus (HIV) at the beginning of the 1980's, the search for new anti-HIV molecules remains an important challenge for the scientific community. Secondary effects associated with viral replication inhibitors, the discovery of receptors and the understanding of the mechanism of the viral entry makes HIV viral entry one of the most promising target for HIV drug development. To date, Enfurvitide is the only approved entry inhibitor as HIV fusion inhibitor. Although highly effective, Enfurvirtide has several serious limitations including high dosing requirements, the administration by injection, and the emergence of resistant strains. An alternative approach that has shown considerable potential is the generation of new D-peptides HIV fusion inhibitors expected to be resistant to proteolytic degradation and useful for the development and the identification of a new class of anti-HIV drugs with improv ed bioavailability.Based on this approach, the present work is dedicated to the synthesis and the study of peptide analogs as HIV fusion inhibitors. First, modeling studies and the synthesis of peptide analogs were devoted to point out and to understand the key elements responsible for the activity of the reference D-peptides. Then, structure activity relationship studies based on different modifications sequences led to the discovery of active peptide analogues as HIV fusion inhibitors. In another approach, in order to decrease peptide nature and consequently to improve the pharmaceutical properties, reduced cyclic peptides were designed. Finally, a novel strategy for cyclic peptide synthesis was developed
Khalil, Ahmad. « Modification de la liaison peptidique : synthèse d'analogues phosphonés du TRH et de la Leu-enképhaline ». Montpellier 2, 1988. http://www.theses.fr/1988MON20046.
Texte intégralShpak-Kraievskyi, Pavlo. « Nouvelles méthodologies pour la synthèse asymétrique de peptides aldéhydiques β3-C-terminaux et de dérivés d’acides aminés disubstitués via hétérocycloaddition ». Thesis, Le Mans, 2013. http://www.theses.fr/2013LEMA1002/document.
Texte intégralPeptide aldehydes are known as protease inhibitors and precursors for many biologically active compounds. Methods for their synthesis involve classically the transformation of a precursor (Weinreb amide, ester, alcohol, acetal) into an aldehyde as one of the final steps to prevent epimerization of the carbon α to the aldehyde. By contrast, β-peptide aldehydes, more stable to epimerization, have been relatively unexplored. They are usually obtained by homologation of the corresponding amino acid despite low yielding steps, an epimerization problem and low number of accessible amino acids. Therefore, new synthetic access to β-peptide aldehydes is still a challenging problem. On the basis of previous work in our team concerning [4+2] and [3+2] diastereoselective cycloadditions, we have developed during this PhD thesis new strategies for the asymmetric access of β-amino acid derivatives by two complementary ways :1) Original six-membered heterocycles 6-ATO (6-alkoxy-tetrahydrooxazinone ) were prepared by a highly stereoselective heterocycloaddition reaction with good yields and de. These cycloadducts were transformed via transacetalisation into both «mixed» and «symmetrical» aminoacetals. Moreover, these new acetals are ideal intermediates for further peptide coupling, leading ultimately to monosubstituted β3-C-terminal peptide aldehydes. 2) By another approach five-membered heterocycles 5-AISO (3,3’-disubstituted 5-alkoxy-isoxazolidines) were obtained via 1,3-dipolar cycloaddition between α-keto ester nitrones and vinyl ether. These compounds were successfully used as precursors of disubstituted β-amino aldehydes after transprotection of the nitrogen atom and N-O cleavage of the isoxazolidine ring. Asymmetric extension of the cycloaddition step was studied by enantioselective and diastereoselective pathways, thus opening unprecedented entry to enantioenriched disubstituted β3,β3-C-terminal peptide aldehydes
Henry, Jennifer A. « Peptide synthesis in relation to isopenicillin N synthase ». Thesis, University of Edinburgh, 1991. http://hdl.handle.net/1842/12076.
Texte intégralMcMath, Andrew. « Synthèse d'analogues cyclopropaniques de peptides ». Paris 5, 1997. http://www.theses.fr/1997PA05P608.
Texte intégralAli, Daham Hassan. « Studies on the antigenicity of citrate synthase ». Thesis, University of Bath, 1989. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233608.
Texte intégralMorisset, Eleonore. « Le silicium pour la production catalytique d'hydrogène et la synthèse d'amides ». Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC233.
Texte intégralThis thesis is based on the use of silicon and its derivatives as species that can meet some current technical challenges. The silylation of alcohols by phenylsilane is an attractive method for the gentle production of hydrogen. This project has demonstrated efficient catalysis with simple and available nitrogen bases. The study of the reaction mechanism suggests that alcohol deprotonation is decisive for this reaction. Phenylsilane has proved its utility in the context of amide synthesis, but also for peptide synthesis in the absence of epimerization. Subsequently, this methodology was extended to synthesis of several Weinreb amides. In order to better understand the reaction mechanism, the synthesis of some substituted phenylsilanes with electron-withdrawing groups and electron-donor groups was undertaken. Finally, the acetylation of amines using silicon acetate was examined. A large panel of primary, secondary amines and anilines were easily acetylated, revealing the synthetic interest of silicon acetate in organic chemistry
Beretta, Margaux. « Synthèse d'analogues de la gougérotine à visée antifongique ». Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS484/document.
Texte intégralIn the current context of the world demographic explosion, agricultural yields need to be as high as possible. The use of efficient and environment friendly pesticides has therefore become essential. In the framework of the discovery of new compounds, natural products remain an important source of inspiration. Among them, we focused on gougerotin, a peptidylnucleoside isolated from a bacteria in the 60’s which possess a broad spectrum of biologic activities. In order to improve antifungal potential and decrease the phytotoxicity of gougerotin, several analogues have been synthesized replacing the natural nucleobase. N-glycosylation is one of the key-reaction in peptidylnucleoside synthesis. During the synthesis of the analogues, a study of the N-glycosylation was carried out with three different donors and several bases. Protectives tests were realized with many pathogens to evaluate antifungal activity of our compounds and a structure-activity relationship was established
Rolland, Valérie. « Synthèse peptidique en milieu organique par une endoprotéase modifiée et supportée ». Montpellier 2, 1990. http://www.theses.fr/1990MON20113.
Texte intégralNun, Pierrick. « Micro-ondes et activation mécanique : applications en synthèse organique et peptidique ». Montpellier 2, 2009. http://www.theses.fr/2009MON20107.
Texte intégralGreen or Sustainable chemistry has become a growing area in the last few years. The necessity to limit the impact of human activities on environment and health, to find new resources for reactants and solvents drives us to develop a new way to perform chemistry. For this purpose, we have chosen to work on the development of new methods allowing us to perform solvent-free reactions. Among all these methods, mechanical and microwaves activations were specifically studied. Using microwaves, we first developed solvent-free Petasis reactions, giving a large variety of tricycles in one step and with a basic aqueous wash as the only purification step. We also showed that the Suzuki coupling could be performed in 10 min at 110°C without any solid support such as alumina and using a new NHC-Pd catalyst, the PEPPSI. Using mechanical activation, the interest of this method for the synthesis of nitrones and hydrazones was proven, the compounds were obtained after condensation of an amine on a carbonyle. Hydrazones could also be N-alkylated in a second step in basic conditions. The applicability of mechanical activation to prepare di- and tri-peptides using activated aminoacids, Urethane N-carboxyanhydrides (UNCA), was also shown. Peptides were obtained after ball-milling a UNCA with an aminoester chlorhydrate in basic conditions. Finally, one of the first applications of a ball-mill in asymmetric synthesis was realized, in order to prepare aminoacids after alkylation of Schiff bases in presence of cinchonidinium salts
Drouin, Myriam. « Monofluoroalcène comme isostère de la liaison peptidique : synthèse, caractérisation et application ». Doctoral thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/35619.
Texte intégralThe unique properties associated with the incorporation of fluorine into bioactive compounds have led to its important use in medicinal chemistry. Nowadays, various fluorinated functional groups are employed. Among them, the monofluoroalkene shows interesting properties. This thesis will present the study of the monofluoroalkene as a peptide bond isostere and will focus on its synthesis, characterization and use as a fluorinated probe. The palladium catalyzed allylic alkylation of 3,3-difluoropropenes using dimethylmalonate and its derivatives was developed. Various monofluoroalkenes were obtained in good yields. An asymmetric variant of the transformation was then investigated, but the transformation was limited to six-membered cycles. Some derivatization of the monofluoroalkenes obtained could be performed, such as a two steps monodecarboxylation procedure to access a peptide bond mimic followed by a β-amino acid. To access α-amino acid derivatives, a bimolecular nucleophilic substitution with allylic rearrangement starting from natural amino acids was briefly investigated. The influence on the hydrophobicity of the incorporation of a monofluoroalkene into the backbone of short peptides was then evaluated. The hydrophobicity index, a parameter that can be determined by using reverse-phase high performance liquid chromatography, was used to quantify the lipophilicity of fluorinated and natural peptides. In every case, the presence of the monofluoroalkene enhanced the hydrophobicity of the compounds. Finally, the monofluoroalkene was incorporated into the backbone of larger peptides to access a new 19F-label for the study of biological events by nuclear magnetic resonance. The motif was integrated into the sequence of two peptides, PGLa and (KIGAKI)3, and the fluorinated mutants were studied using biophysical techniques.
André, Frédéric. « Préparation et structure d'aza-peptides dérivés de l'asparagine et de l'alanine : introduction dans des peptides d'intérêt biologique ». Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL096N.
Texte intégralPassaquin, Anne-Catherine. « Interferon et syntheses hormono-inductibles : etude de l'effet de l'interferon sur la synthese de la lactate deshydrogenase inductible par les catecholamines ». Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13109.
Texte intégralKollappillil, Somakumar Krishnakumar. « Synthesis and analysis of puromycin analogues and amphiphilic peptidyl-RNA conjugates ». Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10086.
Texte intégralA recent pH dependent peptidyl transfer assay in the ribosome with various aminoacyl tRNAs revealed the pH dependence of the peptidyl transfer. Hydrolytic instability makes impossible to obtain the experimental bulk water pKa data for the α-amino groups of 3'-aminoacyladenosine esters. Since puromycin analogues are the most similar analogues of the 3’-end of the aminoacyl tRNAs and they contain a stable amide bond in 3’-position, the determination of the pKa value of the α-amino groups of different puromycin analogues and correlation of these pKa values with those of α-amino groups of the corresponding aminoacyl tRNAs obtained by pH dependent peptidyl transfer deserves attention. Chapter 1 of the thesis focuses on the synthesis of different puromycin analogues and on the determination of their basicities by a pH dependent NMR analysis. This chapter also analyses the intrinsic conformations accessed by the puromycin analogues, as measured by the pH dependence of their J1’-2’ coupling constants. The synthesis of dinucleotide analogues, a xylo-puromycin analogue and a deoxyxylopuromycin analogue will also be described. Peptidyl-RNA conjugates mimic important fragments of natural intermediates of translation. These analogues can be used as an experimental tool to understand the evolution of the coded synthesis of peptides. The novelty in the concept of a ‘molecular deal’ between peptides, oligonucleotides and lipidic bilayers, which may be the basis for the evolution of RNA controlled peptide synthesis, prompted us to synthesize amphiphilic peptidyl-RNA conjugates and to study their interactions with lipidic bilayers. In chapter 2 the solid support synthetic strategies using puromycin analogues as the building blocks will be discussed
Bossu, Isabelle. « Conception et synthèse de nouveaux glycoclusters biologiquement actifs ». Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00680067.
Texte intégralAndreini, Manuel. « Synthèse et étude de C-glycosyl-b-amino acides et de leurs assemblages ». Thesis, Nancy 1, 2008. http://www.theses.fr/2008NAN10023/document.
Texte intégralThe objective of this work was the design and synthesis of short glycopeptides that can fold into well defined and typical secondary structures. b-Peptides frameworks are capable of forming structurally well-defined and predictable structures on short sequences and were therefore chosen for our purpose. In addition, b-peptide backbones are resistant to peptidases and proteases. We were interested in preparing such artificial oligomers modified, like a vaste majority of proteins, by linkage to carbohydrates. The study of carbohydrate-functionalized b-peptides is expected to bring important information concerning the structural stability of such glycoconjugates. In this context, we have presented the homo-oligomerisation of the unnatural glyco-amino acid into a new class of carbopeptoïds. The conformational preference of this first class of oligomers has been assessed by spectroscopic techniques (NMR, IR, CD) and calculations. Another part of this work concerned the synthesis of C-glycosyl-b3-amino acids and O-glycosyl-b3-amino acids as building blocks in the construction of glyco-b-peptides. Finally, we were interested in the synthesis of a new class of glyco-b-amino acids analogues, which are called Na-(C-glycosyl)-hydrazino acids
Awada, Hawraà. « Synthèse sélective de γ-amino acides cyclobutaniques : préparation de nouveaux organogélateurs peptidiques ». Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112365/document.
Texte intégralThe γ-aminobutyric acid (GABA) is the major inhibitory neurotransmitter in the central nervous system (CNS). In order to obtain new enantiomerically pure cyclobutanic derivative of GABA, the cis-3,4CB-GABA, two efficient synthetic strategies have been established. Both synthetic routes employed a photocycloaddition [2 +2] protocol, which provided the cyclobutanic ring. The first route involved the homolgation of the cis-2-aminocyclobutanecarboxylic acid (cis-ACBC), whereas the second route is a multi-step synthesis using caprolactam as starting material.On the other hand, the (1R,2S)-cis-GABA-2,3CB was synthetized, and a series of N- and C-protected oligomers of di, tri, and tetrapeptides of this amino acid were prepared. These oligomers were characterized by NMR (1D and 2D) techniques, IR, and X-ray. The analyses have shown that there are no non-covalent interactions (hydrogen bonds) between the residues of each oligomers. However, the gelation property of these oligomers in various organic solvents was demonstrated. Solutions and gels formed from these peptides were analyzed by scanning electron microscopy, and the obtained images showed a fibrous organization of the di- and tetrapeptide, while the tripeptide showed no regular intermolecular assembly
Frank, Robert. « Untersuchungen zur Synthese, den physikalisch-chemischen Eigenschaften und der biologischen Aktivität von Thioxopeptiden ». [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961200510.
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