Dissertations / Theses on the topic 'Imidazo'
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Oudot, Romain. "Synthèse de dérivés imidazo[1,2-a] pyridines et imidazo[1,2-b] pyridazines tricycliques." Thesis, Tours, 2009. http://www.theses.fr/2009TOUR3804.
Full textThe imidazo[1,2-a]pyridines and imidazo[1,2-b]pyridazines moeities are very studied by scientific community, specially in therapeutic field. This is mostly due to recent progress in metallocatalyzed couplings which allow easier functionnalization of these structures. However, the tricyclic derivatives of these compounds remained not very studied despite important biological properties of some of there isosters. This thesis is divided in two parts : -The synthesis of imidazo[1,2-b]pyridazines with a dinitrogenated third cycle between the positions 7 and 8 in collaboration with Sanofi-Aventis. These new compounds were a real chemical challenge and their synthesis required important works of development. We used various metallocatalyzed couplings methods. -The synthesis of imidazo[1,2-a]pyridines with a pyridinic cycle between the positions 2 and 3. These molecules, poorly described in the literature, have never been subject to biological study. In order to effectively synthesize an interesting range of these structures, I have developed a new heterocyclization method which allows us to obtain in two steps, starting from commercialy available starting materials, some original tricyclics compounds
Grosse, Sandrine. "Imidazo[1, 2-b]pyrazoles, imidazo[1, 2-a]imidazoles : synthèse, fonctionnalisation et évaluation biologique." Thesis, Orléans, 2013. http://www.theses.fr/2013ORLE2056.
Full textImidazo[1,2-b]pyrazoles and imidazo[1,2-a]imidazoles are entities with some interesting applications in pharmacology. However, despite this potential, few methods of preparation and direct functionalisation of the heterocyclic moiety have been described. In this context, the overall goal of our research is to develop new routes to these bicyclic systems from readily available starting materials. Strategies of functionalisation of the heterocyclic moiety were then explored in order to design diversified libraries for the evaluation of potential biological activities. Herein, the results of the tests of imidazo[1,2-b]pyrazole series against various cancer lines are reported
Loubidi, Mohammed. "Synthèse et réactivité de bicycles imidazo[1,2-a]imidazoles et imidazo[1,5- a]imidazoles à visée thérapeutique." Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2037.
Full textThe imidazo-imidazoles bicycles have received special attention among other nitrogen cycles due to their biologically interesting properties exploited in the medicine manufacturing. The imidazo-imidazole scaffold is one of the most representative nitrogen containing heterocycle, as it plays a significant role and possesses a major interest in drug synthesis and functionalization. In this work we report firstly a synthetic pathway to novel imidazo[1,2-a]imidazoles candidates for CKD inhibitors. Secondly we develop two strategies to prepareimidazo[1,5-a]imidazoles and their reactivity via pallado-catalyzed reactions. Finally, we disclose a fast and an efficient access to imidazo[1,5-a]imidazoles by using the Groebke-Blackburn-Bienaymé reaction (GBB), followed by a palladium catalysed intramolecular cyclization, affording thus new tetracyclic products with an elevated degree of molecular diversity
Hervet, Maud. "Réactions d'arylation et d'hétéroarylation métallo-catalysées en séries imidazo[1,2-α]pyridine et imidazo[1,2-β]pyridazine." Tours, 2002. http://www.theses.fr/2002TOUR3803.
Full textAs part of our on-going efforts to study the reactivity and pharmacological properties of bridgehead nitrogen heterocycles developped in our laboratory, we turned out our attention to new methods of arylation and heteroarylation reactions of imidazoazines. In order to realize this study, we investigated the metallo-catalyzed cross-coupling between aryl halides or sulfonates and organometallic compounds which constitute the most powerful C(sp²)-C(sp²) bond-forming reactions. We chose to study four cross-coupling reactions which are widely used in organic chemistry : Suzuki, Kumada, Negishi and Stille. In each case, the two possible ways of functionalization were investigated, from the halogenoimidazoazine or its corresponding organometallic derivative. Our initial forays was the investigation of reactivity of 3 and 6 positions of imidazo[1,2-α]pyridines and imidazo[1,2-β]pyridazines toward the Suzuki-type reaction. Then, each coupling method was applied on the 3 and 6 positions of imidazo[1,2-α]pyridine in order to establish optimal conditions of functionnalization
El, Akkaoui Ahmed. "Synthèse et réactivité d'imidazo[1,2-x]azines : obtention de composés polycycliques." Phd thesis, Université d'Orléans, 2009. http://tel.archives-ouvertes.fr/tel-00497002.
Full textLüthge, Thomas. "Synthese und Fluoreszenzeigenschaften von substituierten Imidazo[4,5-c]carbazolen." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961145889.
Full textMason, Richard J. Jr. "A novel and efficient synthesis of imidazo[1,5-a]Pyridines." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2007. http://digitalcommons.auctr.edu/dissertations/2361.
Full textMason, Richard J. Jr. "A novel and efficient synthesis of imidazo[1,5-a]pyradines." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2007. http://digitalcommons.auctr.edu/dissertations/3047.
Full textGueiffier, Alain. "Hétérocyclisation en série imidazo [1,2-a] pyridinique : synthèse, structure, pharmacologie." Montpellier 1, 1989. http://www.theses.fr/1989MON13505.
Full textEzzili, Cyrine. "Voies d'accès aux imidazo[1,2-b]pyridazines par synthèse parallèle." Paris 11, 2005. http://www.theses.fr/2005PA112371.
Full textMy PhD project deals with the discovery of new access to imidazo[1,2-b]pyridazines derivatives. This work was conducted in a close collaboration between the Fournier laboratories and the CEA (CIFRE contract). Our project was limited to the use of synthesis that undergo combinatorial chemistry and permit the production of several hundread of molecules. Three strategies were studied. The first one was based on the cyclisation of Tschitschibabin. This reaction lies on a condensation between an aminopyridazine and an alpha-halocarbonyle derivative. All the conditions carried out were not successuful for the production of libraries. In this field, we have imagined a new way to synthesize our heterocycle which we named the inversed Tschitschibabin’s cyclisation. The first step is the formation of an amide from an aminopyridazine and an alpha-bromocarboxylic acid. The obtained product is cyclised to the desired 2-hydroxyimidazo[1,2-b]pyridazine structure. The second strategy studied has allowed the synthesis of a pivotal scaffold for which we introduced three points of diversity by well known organic reactions. We have synthesised a 440-member imidazo[1,2-b]pyridazine library. The last strategy is inspired from a multicomponent reaction which involves an amine, an haldehyde and an isocyanide. This reaction allows the production of a large number of moleules in one step using combinatorial techniques. Unfortunatley, all the conditions carried out were not successuful for the production of libraries
Weaver, George William. "Investigations of new synthetic routes to imidazo[4,5-b]pyridinone derivatives." Thesis, University of Edinburgh, 1990. http://hdl.handle.net/1842/12144.
Full textRydzkowski, Richard. "Synthèse et réactivité de nouveaux phénols : hydroxy-8 imidazo (1,2-a) pyridine." Lille 1, 1985. http://www.theses.fr/1985LIL10022.
Full textNguyen, Thê Hùng. "Pyrazino-, Imidazo- et Triazolo-pyranoacridones à potentialités antitumorales : synthèse et évaluation biologique." Paris 5, 2008. http://www.theses.fr/2008PA05P649.
Full textThe diacetate of diol of benzo[b]acronycine (S23906-1) showed a marked antitumor activity in vivo. Platelet toxicity appeared in the course of phase 1 clinical trial. In order to obtain compounds as active as S23906-1 but presenting modified pharmacokinetic properties, products of second generation with a A heterocyclic cycle have been prepared. Access to these compounds was obtained through the intermediacy of 9,10-diaminoacronycine. About thirty pyrazino[2,3-b], imidazo[4,5-b] and triazolo[4,5-b]acronycine have been prepared. The cytotoxic activity of these compounds has been evaluated on two cellular models: L1210 murine leukemia and KB-3-1 epidermoid human carcinoma. The diacetate of the (±)-cis-1,2-dihydroxy-pyrazino[2,3-b]acronycine showed promising cytotoxic activity comparable to that of S23906-1
Guthrie, Kevin Mark. "Biophysical analysis of interaction of dihydro-imidazo-phenanthridinium based compounds with DNA." Thesis, University of Glasgow, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486740.
Full textTber, Zahira. "L'imidazo[1,2-a]pyridine : fonctionnalisation et synthèse des nouveaux polyhétérocycles." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2021.
Full textThe preparations of imidazo[1,2-a]pyridine is one of important research topic in organic synthesis, This entitie present some interesting biological activities. First, we devoleped a new rapid and efficient strategies to functionalize position 6 of the imidazo[1,2-a]pyridine with various amines and thiols catalysed by copper and iron. Then we applied this procedure to the preparation of symmetric and asymmetric thioethers using 2 mercaptobenzooxasole, which is an economical reagent and which presents no chemical risk. The last part of this work concerns the development of new multicomponent reactions for the synthesis of various pyrrolo[3',2':4,5]imidazo[1,2-a]pyridine and 5-amino pyrido[2’,1’:2,3] imidazo [4,5-c]isoquinoléines
Juškėnas, Robertas. "Synthesis of tricyclic heterosystems based on pyrazolo[3,4-d]pyrimidine framework. Study of intramolecular reaction of pyrimidine nitrogen atom with O,O-acetals." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140630_154044-28576.
Full textHeterociklų chemijos vystymasis turi didelę reikšmę įvairioms mokslo sritims ir pramonės raidai. Pagrindinis šios chemijos srities uždavinys – kurti naujus heterociklinių junginių sintezės metodus, leidžiančius paprasčiau, efektyviau gauti norimos struktūros junginius. Tai apima ne tik heterociklų formavimo būdus, bet ir jų funkcionalizavimą, leidžiantį sukurti įvairiomis cheminėmis ir fizikinėmis savybėmis pasižyminčių junginių įvairovę. Šios mokslo srities pasiekimai pritaikomi biochemijoje, farmacijoje, fotofizikoje ir kitose mokslo ir pramonės šakose. Šiame darbe buvo siekiama sukurti efektyvius heterosistemų sintezės būdus, kuriuos galima pritaikyti pirazolo[3,4-d]pirimidino fragmentą turinčių heterociklų formavimui. Šio darbo metu buvo susintetintos trys iki šiol neaprašytos heterociklinės sistemos atliekant peri-kondensuotų heterosistemų sintezę iš 3-amino-4-chlor-1-metil-6-metiltio-1H-pirazolo[3,4-d]pirimidino. Surastos tinkamos sąlygos 4-(2,2-dietoksietilmino)pirimidinų ciklizacijai į 3-etoksi-2,3-dihidroimidazo[1,2-c]pirimidinus. Ištirta pirimidino žiede esančių pakaitų įtaka šiai reakcijai. Parodyta, kad ši reakcija yra suderinama su tokiomis funkcinėmis grupėmis, kaip alkiltio-, cian-, amino-, formilgrupės. Surastas metodas 3-etoksi-2,3-dihidroimidazo[1,2-c]pirazolo[4,3-e]pirimidinų etoksigrupės pakeitimui benziltiogrupe.
Juškėnas, Robertas. "Triciklių heterosistemų, turinčių pirazolo[3,4-d]pirimidino fragmentą, sintezė. Intramolekulinės pirimidino azoto atomo reakcijos su O,O-acetaliais tyrimas." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140630_154058-49723.
Full textThe development of heterocyclic chemistry is important for various science areas and for the industry. The main task of this branch of chemistry is the search for the new, more effective synthetic methods for obtaining heterocyclic derivatives. That covers not only the formation of heterocycles, but also their functionalization, which leads to the creation of compounds having various chemical and physical properties. The accomplishments of this area are applied in biochemistry, pharmacochemistry, photophysics and other branches of science and industry. The creation of effective heterocycles synthesis methods, that may be applied for the formation of heterosystems based on pyrazolo[3,4-d]pyrimidine was the main aim in this work. During this work, three hitherto unknown peri-fused heterocyclic systems based on pyrazolo[3,4-d]pyrimidine scaffold were synthesized. The suitable conditions for the cyclization of 4-(2,2-diethoxyethyl)aminopyrimidines to 2,3-dihydroimidazo[1,2-c]pyrimidines were found. The influence of functional groups in pyrimidine moiety for the course of this reaction was investigated. It has been shown that functional groups including alkylthio, cyano, amino, formyl are tolerated in this type of reaction. The method for the replacement of ethoxy group with benzyl mercaptan in 3-ethoxy-2,3-dihydroimidazo[1,2-c]pyrazolo[4,3-e]pyrimidines has been found.
Mongeot, Alexandre. "Synthèse, réactivité et intérêts pharmacologiques de nouvelles imidazo[-x]azines et de nouveaux imidazoles." Strasbourg 1, 2006. http://www.theses.fr/2006STR13254.
Full textMarhadour, Sophie. "Synthèse et évaluation biologique d'imidazo[1,2-a]pyridines et imidazo[1,2-a]pyrazines substituées." Nantes, 2012. https://archive.bu.univ-nantes.fr/pollux/show/show?id=4e0f80d9-0044-48fd-8bbb-b95ca715891a.
Full textMolecules based on imidazo[1,2-a]pyridine and imidazo[1,2-a]pyrazine heterocyclic systems showed a wide variety of therapeutic applications. Thus, the design of new imidazo[1,2-a]pyridine derivatives, substituted in position 2 and 3, but also imidazo[1,2-a]pyrazine derivatives functionalized at position 6, was considered in order to expand the profile of pharmacological activity. In particular, fungal infections (Candida albicans, Aspergillus fumigatus) and parasitic diseases (Leishmania) represent a major public health problem. Several classes of compounds for the treatment of these infections are currently in clinical use. However, their use is limited for reasons of toxicity, bioavailability and especially resistance which is the major problem requiring the discovery of new treatments. Preliminary results pointed out that the use of a specific inhibitor of PKC and MAP fungal kinases restored the sensitivity of several strains of C. Albicans to azoles, hence the interest of targeting this cascade. Similarly, Leishmania protein kinase C activity has been demonstrated. Among the tested compounds, the emergence of an activity, whether on C. Albicans or A. Fumigatus, could not be observed while promising Leishmania major activities have been established
Smith, Louise Victoria. "Dihydro-Imidazo Phenanthridinium (DIP)-based DNA Binding Agents with Tuneable Structures and Biological Activity." Thesis, University of Glasgow, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484912.
Full textN'Guessan, Déto. "Conception, synthèse et évaluation des activités anthelminthiques de nouvelles molécules à support imidazo (1,2-a) pyridine." Thesis, Tours, 2017. http://www.theses.fr/2017TOUR3802.
Full textVeterinary strongylosis is one of the main causes of gastroenteritis and anemia in sheep and goats causing major economic losses. However, their management by existing anthelmintics, is confronted with the proliferation of drug resistance of the nematodes incriminated. The first part of this thesis presents the magnitude of the problem posed by the resistance of helminths involved in strongylosis of small ruminants. It also reveals the innovative profile of imidazo[1,2-a]pyridinyl-phenylacrylonitriles that are proposed to counter the increasing ineffectiveness of anthelmintics
Bénézech, Véronique. "Approche de la réceptologie des (alkylamino)imidazo[1,2-a]pyrazidines : Synthèse et évaluation d'un outil pharmacologique." Montpellier 1, 1997. http://www.theses.fr/1997MON13512.
Full textElhakmaoui, Ahmed. "Synthèse, étude structurale et passage membranaire de C-nucléosides acycliques en séries imidazo[1,2-a]azines." Montpellier 1, 1992. http://www.theses.fr/1992MON13515.
Full textVitse, Olivier. "Etude pharmacochimique en série imidazo[1,2-a]pyrazine : Synthèse, réactivité (substitution électrophile, métallation) et activité bronchodilatatrice." Montpellier 1, 1997. http://www.theses.fr/1997MON13519.
Full textDelest, Bruno. "Synthèse de nouveaux tétracycles à structure imidazo[4,5-c]pyrrolo[3,2-g]quinoléine, à potentialités antitumorales." Nantes, 2002. http://www.theses.fr/2002NANT22VS.
Full textThe antitumoural interest especially as topoisomerase II inhibitors of flat polycyclic aromatic molecules such as ellipticines, grossularines and amiloride has justified to have access to tetracyclic structures of the type imidazo[4,5-c]pyrrolo[3,2-g]quinoline. Two pathways have been considered to give access to these compounds : condensation of substituted guanidines with properly functionalized quinoline-2,3,4-triones and palladium-catalyzed annulation of N-aryl-2-imidazolylcarboxamides. The cytotoxic activity and the effect on the cellular cycle of these compounds have been evaluated on L1210 cancerous cells strain. The most active compounds on this model have IC50 of 3 [micro]M. The inhibitory activities on Chk-1 and Src kinases, which are implicated respectively in G2-phase checkpoint control and signal transduction, have also been evaluated. An N-(indol-6-yl)-2-(imidazol-5-yl)carboxamide derivative showed significant activity on Src kinase at 1 [micro]M
Laurent, Florence. "Etude des mécanismes d'action et des propriétés pharmacologiques d'une nouvelle série de dérivés imidazo[1,2-a]pyraziniques." Montpellier 1, 1993. http://www.theses.fr/1993MON13516.
Full textMiddleton, David Andrew. "The interaction of substituted imidazo[1,2-a]pyridines with model membranes and with the gastric H/K-ATPase." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335768.
Full textHerzog-Weber, Svenja [Verfasser], Rainer [Gutachter] Beckert, and Dieter [Gutachter] Weiß. "4H-Imidazo[4,5-b]chinoxaline : eine neue Klasse redoxaktiver Flourophore / Svenja Herzog-Weber ; Gutachter: Rainer Beckert; Weiß, Dieter." Jena : Friedrich-Schiller-Universität Jena, 2016. http://d-nb.info/1177613778/34.
Full textSalles, Helena Domingues de. "Preparação estudo e aplicação do compósito Cu/SiO2 como catalisador na síntese multicomponente de imidazo[1,2-a]piridinas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/98152.
Full textIn this work it was explored the application of a copper based heterogeneous catalyst on multicomponent reaction for obtention of substituted imidazo[1,2- a]pyridine heterocyles, molecules with interesting pharmacological applications. The catalyst Cu/SiO2 was synthesized through the sol-gel process, by adding copper chloride (II) on hydrolysis and polycondensation of an alcoxysilane precursor in acidic media. Reproducibility of the synthesis of this material was studied by variation of sol-gel parameters. Analysis of scanning electronic microscopy with energy-dirpersive spectroscopy, BET and BJH isotherms, DFT theoretical calculation and flame atomic absorption spectroscopy aiming to achieve a material with composition, surface and porosity feasible with an efficient heterogeneous catalyst. It was proven the catalytic activity of the composite Cu/SiO2 in the reaction between 2- aminopyridine, phenylacethylene and diverse aldehydes furnishing imidazo[1,2-a]pyridines with good yields. The reaction mechanism was proposed and the products characterized by gas chromatography with mass spectrometer and nuclear magnetic resonance of hydrogen and carbon-13.
Hanoun, Jean-Pierre. "Synthèse et physico-chimie de pentacycles et de bétai͏̈nes imidazo et thiazolo acridinoniques : étude de l'équilibre azide/tétrazole." Aix-Marseille 3, 1996. http://www.theses.fr/1996AIX30102.
Full textABARGHAZ, MUSTAPHA. "Nouveaux derives des imidazo(1,2-c) quinazolinones : synthese et etude de la liaison aux recepteurs aux benzodiazepines peripheriques." Université Louis Pasteur (Strasbourg) (1971-2008), 1992. http://www.theses.fr/1992STR13074.
Full textArama, Patomo Dominique. "Conception et synthèse de nouveaux inhibiteurs de la kallicréine 7." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONT3503/document.
Full textHuman tissular kallikreins (KLKs) are members of (chymo)trypsin-like serine proteases, involved in various physiological pathways. Among the 15 known isoforms in the literature, kallikrein 7 (KLK7) plays a significant role in physiological and pathophysiological processes of the skin, like psoriasis and the Netherton syndrome. Several studies report also its implication in multiple processes leading to invasive and metastatic tumor growth, especially in prostatic, ovarian and pancreatic cancers. Strategies focused on KLK7 inhibition are a promising alternative for the treatment of such dermatological diseases, and to avoid metastatic dissemination. In the last two decades, many synthetic inhibitors of this KLK isoform have been developed. However, most of these molecules exhibit low selectivity and unsuitable physicochemical properties for in vivo use. This thesis is devoted to the synthesis of selective and reversible inhibitors of KLK7. Two series of compounds have been explored. The first one, derived from a screening of pyrido-imidazodiazepinones compounds, which led to the discovery of a reversible and selective inhibitor of KLK7, JMV4967 (IC50 = 57.0 µM). This compound is characterized by the presence of an ortho methyl substituted phenyl group, at position 2 of the diazepine ring. Based on these results, a structure-activity relationships (SAR) study was initiated. The best inhibitions were obtained with JMV4967analogs bearing a 3,4,5- trimethoxyphenyl group or 3,4- dimethoxyphenyl group, at position 2 of the diazepine ring. This study led to the discovery of one compound, JMV5046 (IC50 = 33.5 µM). A biochemical study of JMV5046, highlighted its reversible and competitive behavior against the substrate in the KLK7 active site, as previously observed for the initial hit. The second series was developed from an amino-benzimidazole substituted quinazoline, and a SAR study was also carried out. A chemical reactivity study was also initiated to access two new series of imidazo[1,2-a]pyridine-fused or indole-fused diazepine compounds. This study showed that 2-amino-imidazopyridine could undergo alkylation at position 3 of the ring, in the nitro-Michael reaction context. The obtained Michael adducts could then give, after reduction of the nitro group, the corresponding diazepine derivatives. We also showed that, in the presence of an acyl donor (as an activated amino acid ester), 2-amino-indole was N-acylated, unlike the 2-amino-imidazopyridine which leads to an exclusive C-acylation in the same conditions. The N-acylated derivatives were then used for the indolodiazepines synthesis, using Pictet-Spengler cyclization reaction.The synthesis of these compounds and their inhibiting activity against KLK7 are described. Molecular modeling experiments by in silico docking, to determine the structural requirements for KLK7 inhibition by JMV5046, are also presented
Figueiredo, Renata Marcia de. "Synthèse de nouveaux composés conçus pour mimer l'état de transition de la protéine farnésyltransférase." Paris 11, 2005. http://www.theses.fr/2005PA112060.
Full textThe protein farnesyltransferase (ftase) catalyses the addition of the 15-carbon isoprenyl farnesyl moiety to a selected group of cellular signal transduction proteins including ras gtpases. 30% of all human cancers are associated with the appearance of oncogenic mutants of ras in tumor cells. The development of ftase inhibitors is therefore an active area in the discovery of new chemotherapeutics. The efficient synthesis of new compounds based on the imidazole ring as a core structure with a diacid in c-2 position and a tripeptide in c-4 or c-5 position of this ring is described. The key steps are a functionalisation of the c-2 position with the acidic side chain and peptide coupling at the c-4 or c-5 positions. For the functionalisation of c-2 position, three strategies have been investigated. The first one was the alkylation reactions, the second one was palladium-catalysed reactions and the last one was the horner-wadsworth-emmons reactions. For the peptide coupling we have used the reductive amination reaction. Several new compounds have been synthesised during this study, with good yields, some of which having promising enzymatic activity. In the course of this study, we have also found a new way to synthesize imidazo[2,1-a]isoindole derivatives by palladium-catalyzed arylation of readily avaible 2-iodoimidazoles. The mechanism of this arylation likely proceeds through a c-h activation. After optimising the experimental conditions, this reaction has been applied on different substrates
Bou, Karroum Nour. "Synthèse et développement de nouvelles molécules hétérocycliques tricycliques : étude de leurs propriétés immunomodulatrices." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTT014/document.
Full textToll-like receptors 7 and 8 play an important role in immune system activation. Their stimulation leads to the production of pro-inflammatory cytokines and type I interferons. Both receptors recognize viral ssRNA, as well as synthetic tricyclic imidazoquinoline derivatives such as imiquimod (TLR7 agonist) and resiquimod (TLR7/8 agonist). These two molecules showed significative anti-cancer and adjuvant activities. Many reports in the literature have been focused on the development of new TLR7/8 agonists belonging to different chemical series. These agonists strongly induce the production of T helper 1-polarizing cytokines and may therefore serve as promising candidate vaccine adjuvants. Despite the essential roles of TLR7 and TLR8 in the immune system stimulation, chronic immune activation may be responsible for several infectious and autoimmune diseases. Consequently, the development of TLR7 inhibitors may play an important role in the therapy of these diseases.In this study, we are interested in the synthesis and development of new heterocyclic molecules, analogs of imiquimod and resiquimod, in order to identify new TLR7 and/or TLR8 ligands. Different synthetic pathways have been developed, using cross coupling reactions, in order to obtain a wide variety of molecules belonging to three chemical series: imidazo[1,2-a]pyrazine, imidazo[1,5-a]quinoxaline et pyrazolo[1,5-a]quinoxaline. Various alkylation reactions were attempted on these three chemical series in order to introduce a wide variety of substituents on the five-membered ring. The application of Sonogashira's cross-coupling allowed us to establish a C-C bond and introduce various alkyl chains. All compounds have been tested for their TLR7/8 agonistic and antagonistic activity using HEK-Blue™-hTLR7/8 cells. The synthesized compounds are completely inactive as TLR7/8 agonists and are selective TLR7 antagonists. Two compounds of the pyrazolo[1,5-a]quinoxaline series, compound 5.35a and 5.35b, bearing butyl and isobutyl chain respectively, are potent and selective TLR7 antagonists with low micromolar IC50. Results allowed us to discover significative activity for the pyrazolo[1,5-a]quinoxaline series as selective TLR7 antagonists, which may therefore play an important role in the therapy of several infectious or autoimmune diseases
Pellegatti, Laurent. "Méthodologie en chimie hétérocyclique et application à la synthèse d'inhibiteurs de kinases." Thesis, Orléans, 2010. http://www.theses.fr/2010ORLE2046.
Full textCancer, one of the leading causes of death, represents today a major public health problem. Over the last few years, marine alkaloids represent a source of inspiration for chemists in order to obtain new anticancer drugs. For this purpose, as a part of our laboratory researches, analogues of marine alkaloids were synthesized possessing a tris-aromatic structure. We developed originals analogs of these alacaloïds formed by a central heterocycle core (1,2,4-triazine et imidazo[1,2-b][1,2,4,5]tetrazine) on wich is graft two arylic moiety variously substituted. Obtaining these compounds was also an opportunity to develop news synthetic methodologies. So a new Buchwald-Hartwig reaction type based on methylsulfanyl-1,2,4-triazines has been perfect, as palladocatalyzed CH arylation pathway on imidazo[1,2-b][1,2,4,5]tetrazine. A part is devoted to Groebke-Blackburn multicomponant reaction. Various pharmacological analyses were carried out in particular with inhibition of various kinases and cytotoxicity evaluation on various human cancer cell lines
Sayer, J. R. "The synthesis of imidazo[1,2-a]pyrazines as inhibitors of the VirB11 ATPase and their incorporation into bivalent compounds." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1398301/.
Full textAbu-Shakra, A. M. "Studies on the formation and mutagenic activity of some amino-imidazo azaarenes in foods subjected to high-temperature cooking." Thesis, University of Surrey, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374077.
Full textSantos, Deise Maria Pereira de Oliveira. "Síntese e estudo das prorpriedades térmicas de derivados dos heterocíclos 1,3,4-tiadiazol, tiazol e imidazo[2,1-B][1,3,4]tiadiazol." Florianópolis, SC, 2011. http://repositorio.ufsc.br/xmlui/handle/123456789/95962.
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No presente é reportada a sintese de três novas series baseadas em heterociclos derivados de enxofre, são eles: are imidazo[2,1-b][1,3,4]tiadiazol, tiazol e 1,3,4-tiadiazol. O heterociclo fusionado imidazo[2,1-b][1,3,4]tiadiazol é preparado com bons rendimentos (54-71%), através da ciclodesidratação entre derivados do 2-amino-1,3,4-tiadiazol e a-bromoarilcetonas. Os derivados do 2-amino-1,3,4-tiadiazol foram obtidos pela condensação térmica entre a tiozemicarbazida e aril/alquil nitrilas com bons rendimentos. A a-bromação das aryl cetonas foi feita usando NBS como fonte de bromo eletrofílico, e também obteve bons rendimentos (52-85%). A síntese das séries dos derivados dos heterociclos 1,3,4-tiadiazol e tiazol também é reportada. Os compostos finais destes heterociclos foram preparados por reação de acoplamento cruzado Sonogashira-Tohda entre arilacetilenos e os brometos de heteroaril/arila, 2-bromo-5-(4-(deciloxi)fenil)-1,3,4-tiadiazol ou 2-(4-bromofenil)-5-(alquil)tiazol. Para ambas as series a reação de acoplamento cruzado foram obtidos bons rendimentos (67-78%), todavia a reação de acoplamento cruzado usando o derivado quiral do tiazol foi obtido com baixo rendimento (37%), porque foi isolado também o produto de homoacoplamento do arilacetileno. As propriedades térmicas foram determinadas por DSC e por microscopia óptica de luz polarizada. Para as três series o comportamento liquido cristalino observado foi do tipo polimorfismo esmético. Na série do imidazo[2,1-b][1,3,4]tiadiazol o comportamento liquido cristalino é dependente do número de cadeias. O mesomorfismo não foi observado em compostos sem cadeias ou com mais de duas cadeias. Todos os derivados do 1,3,4-tiadiazol e tiazol mostraram mesomorfismo calamitico apesar da grande curvatura no núcleo rígido gerado pelo heterociclo de cinco membros substituído na posição 2 por grupo etinil (derivado do tiadiazol) ou por grupo fenil (derivados do tiazol). Estas séries mostraram polimorfismo esmético e temperaturas de fusão relativamente baixas.
Herein, the syntheses and properties of novel series of liquid crystals based on Sulfur containing heterocyclic cores i.e. imidazo[2,1-b][1,3,4]thiadiazole, thiazole and 1,3,4-thiadiazole, are reported. The various derivatives of the fused heterocycle, imidazo[2,1-b][1,3,4]thiadiazole, were prepared via cyclodehydration reactions between 2-amino-1,3,4-thiadiazole derivatives and á-bromoaryl ketones in moderate yields (54-71%). The derivatives of 2-amine-thiadiazole were obtained by condensation reaction between thiosemicarbazide and aryl/alkyl nitriles in moderate to good yields (60-83%). The á-bromination of aryl ketones was carried out in reasonable to good yields (52-85%) using NBS as the source of electrophilic bromine. The syntheses and properties of a series of 1,3,4-thiadiazoles and thiazoles are also reported. The final compounds of these heterocycles were obtained by Sonogashira-Tohda cross-coupling between aryl acetylenes and heteroaryl bromides i.e. 2-bromo-5-(4-(decyloxy)phenyl)-1,3,4-thiadiazole or 2-(4-bromophenyl)-5-(alkyl)thiazole. For both series, the cross-coupling reactions resulted in good yields (67-78%). However, the cross-coupling reaction with chiral derivate of thiazole furnished the desired product in low yield (37%) accompanied by isolation of the homocoupled product formed by the competing reaction between arylacetylene. Thermal properties of the synthesized compounds were analysed by Differential Scanning Calorimentry (DSC) and Polarized Optical Microscopy (POM). All the three series of mesogens showed smectic polymorphism. In the imidazo[2,1-b][1,3,4]thiadiazole series, the liquid crystalline behavior was observed to be dependent on the number of alkyl side chains. Mesomorphism was not observed for compounds without or with more than two side chains. All the 1,3,4-thiadiazole and thiazole derivatives showed calamitic mesomorphism despite the sharp bent in their rigid cores caused by substitution, with ethynylaryl group at position 2 of the five membered heterocycle. These series showed smectic polymorphism and relatively low melting temperatures.
Raihane, Mohamed. "Reactions d'annelation en serie imidazo(1,2-a)pyridine : acces aux systemes pyridoimidazo(iso)quinoleiniques et imidazopyridodiazepiniques isosteres de tibo." Clermont-Ferrand 1, 1996. http://www.theses.fr/1996CLF1PP01.
Full textBenaissa, Idir. "Ligands imidazo[1,5-a]pyridin-3-ylidènes fonctionnalisés : synthèse, chimie de coordination et applications en catalyse à l'or(I)." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30194.
Full textThis PhD work concerns the chemistry of N-heterocyclic carbenes (NHCs) and its main objective consists in the development of new NHC ligands based on the imidazo[1,5-a]pyridin-3-ylidene (IPy) platform whose position 5 is functionalized by an anionic or neutral, and potentially chiral barbituric heterocycle. The major advantage of this rigid bicyclic structure lies in the "L-shaped" geometry of the generated ligands, which is particularly well adapted to gold (I) catalysis. In a first time, the chemistry of an achiral version of this family is reported. After describing the synthetic pathway to the zwitterionic precursors, the anionic and neutral gold(I) complexes supported respectively by an anionic NHC and neutral NHC ligands obtained by C- and O-functionalization of the malonate part of the barbiturate heterocycle were synthesized and characterized. The comparative study of these complexes as pre-catalysts in alkyne hydroelementation and domino reaction reactions, involving cycloisomerization of 1,6-enyne followed by nucleophilic addition, showed that the O-methylated ligand complex is the best in the series, as well as superior to conventional NHCs in both activity and selectivity (TON and TOF). The remarkable efficacy of these Au(I) complexes has been rationalized by the electronic and steric stabilization of the active species of cationic gold(I) by the NHC ligand. In a second step, the oxidation process of Au(I) to Au(III) complexes using an external oxidant was studied in detail, and showed that the anionic ligand rearranged from monodentate in Au(I) complex to LX-type bidentate ligand in Au(III) complexes, resulting from a deformation of the barbituric heterocycle and rehybridization of the central malonic carbon atom. This behavior is general as soon as the coordination geometry of the metal center leaves a cis coordination site next to the carbenic center. The complexes of Pd(II), Rh(I), Ir(I) and Mn(I) are thus synthesized and characterized. Structural analysis of the complexes shows that the degree of malonic carbon hybridization is a function of the electrophilicity of the metal, with a more pronounced sp3 character when the electron-density on the metal is lower. A library of three chiral ligands has been synthesized from (S)-(-)-1-phenylethylamine as the source of chiral information through a convergent synthesis strategy similar to that of achiral derivatives. The corresponding Au(I) complexes have been synthesized and used as pre-catalysts in 1,6-enyne domino reactions and provide access to good yields and enantiomeric excesses of up to 70%. In parallel, the reactivity of the 5-bromoimidazo[1,5-a]pyridinium platform with malonate esters and 2-arylacetate esters has been developed. This study proves the intermediacy of free NHCs as reaction intermediates in the synthesis of fused heterotricyclic mesoionic compounds
Fersing, Cyril. "Synthèse et étude des relations structure-activité de nouvelles 3-nitroimidazo (1,2-a) pyridines anti-kinétoplastidés." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0275/document.
Full textThe kinetoplastids of the Leishmania and Trypanosoma genus are the causative agents of neglected tropical diseases that threaten nearly half a billion people in the intertropical zone, resulting in 50 000 deaths per year. Among the molecules in clinical development to treat these pathologies, fexinidazole is a prodrug belonging to the 5-nitroimidazoles family, which exerts its anti-infectious action via a bioactivation step catalyzed by parasitic nitroreductases (NTR), enzymes whose cofactor is a flavin. In order to identify novel nitroheterocycles as parasitic NTR substrates, a small chemical library of imidazo[1,2-a]pyridines synthesized by our laboratory was screened in vitro, leading to the identification of a Hit molecule active both on Leishmania donovani and Trypanosoma brucei brucei. This compound served as a starting point for a pharmacomodulation work, initially in position 8 of the imidazo[1,2-a]pyridine ring: the introduction of various chemical groups using the pallado-catalyzed coupling reactions of Suzuki-Miyaura, Sonogashira and Buchwald-Hartwig, or SNAr reactions, highlighted several "lead" compounds with a significantly improved biological profile. In a second step, the pharmacomodulation work was extended to positions 2, 3 and 6 of the imidazo[1,2-a]pyridine ring in order to complete the structure-activity relationship data, to study in particular the impact of the redox potential and to optimize the physicochemical and in vitro pharmacokinetic parameters of the best compounds in order to initiate the study of their in vivo activity on a trypanosomiasis mouse model
Albrecht, Georg [Verfasser]. "Imidazo[1,5-a]chinoline und Metall bis(bis(8-chinolinyl)amid) Komplexe als neue Komponenten für organische Halbleiterbauteile / Georg Albrecht." Gießen : Universitätsbibliothek, 2019. http://d-nb.info/1193422884/34.
Full textParenty, Alexis Didier Christian. "A new methodology for the synthesis of dihydro-1H-imidazo-[1,2-f]-phenanthridinium (DIP) cations as potential anti-cancer therapeutics." Thesis, University of Glasgow, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479102.
Full textBaladi, Tom. "Autour du noyau imidazo[4,5-b]pyridine : inhibiteurs potentiels de la protéine kinase Tyro3 et fonctionnalisation directe de liaisons C – H." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS386/document.
Full textBladder cancer is a major medical issue, being the fourth most frequent cancer in men and treatable only with heavy surgery and/or broad-spectrum chemotherapy. This thesis project deals with the discovery of new targeted therapies of bladder cancer by blocking specifically, at a molecular scale in cancer cells, the signaling pathways in which protein kinase Tyro3 is involved. Indeed, its overexpression in most bladder cancers and the major part it plays in cancer cells survival have led to the validation of protein kinase Tyro3 as a therapeutic target for the treatment of bladder cancer. This thesis project can be divided into three main parts: the development of new synthetic methods around the imidazo[4,5-b]pyridine scaffold, the synthesis of a library of compounds using these methods and eventually the study of structure-activity relationships of these compounds versus Tyro3
Dyers, Leon Jr. "The synthesis of new 3d-4f acylic salen metallic complexes and the rapid microwave-assisted synthesis of imidazo[1,5-ɑ]pyridines." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2007. http://digitalcommons.auctr.edu/dissertations/2700.
Full textArico, Joseph William. "3-Substituted Purines: Methodology, Synthesis, and Studies of DNA Hydration in the Minor Groove." Thesis, Boston College, 2010. http://hdl.handle.net/2345/1824.
Full textAs the central repository of biological information and ultimate mediator of all processes underlying the activities of living organisms, nucleic acids are the sine qua non for life as we know it. Biological research over the past century and more has revealed much of the structure and function of nucleic acids, revealing in turn how life begins, changes, reproduces, and ends. We glimpse how life has become what it is and perhaps what it may become. This work seeks to understand the ramifications of altering a single nitrogen of the purine nucleoside components of nucleic acids. As will be shown, purine analogs lacking the N3 nitrogen have altered interactions with proteins, water, and other molecules. Replacement of this nitrogen with a C-H, C-CH3, or C-CH2OH functionality impacts the structure and biological interactions of a DNA duplex containing these alterations in ways not entirely foreseen when this work began over ten years ago. The synthetic effort needed to obtain purine nucleosides containing each of these modifications is significant. Along the way, new methodologies applicable both to the synthesis of purine analogs and natural purine nucleosides are described
Thesis (PhD) — Boston College, 2010
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
Bendjeddou, Lyamin. "Synthèse et évaluation biologique de nouveaux inhibiteurs de kinases : identification d‘inhibiteurs de kinases parasitaires." Thesis, Paris 5, 2014. http://www.theses.fr/2014PA05P615.
Full textPhosphorylation by protein kinases is one of the most important post-translational modification in cellular processes such as division, differentiation, proliferation and apoptosis. Kinase deregulation is associated with numerous diseases such as cancer or neurodegenerative diseases. Imidazo[1,2-b]pyridazine and imidazo[4,5-b]pyridine were prepared to inhibit protein kinases involved in diseases targeted in the laboratory. The imidazo[1,2-b]pyridazines were synthesized to identify inhibitors of CLK1 and DYRK1A, potential targets in Alzheimer's disease. Among the imidazo[1,2-b]pyridazines synthesized, several molecules were found selective of DYRKs and CLKs, with IC50 < 100 nM. A structure-activity relationship based on the synthesis of 70 molecules, led to the identification of the structural bases of the selectivity. Products were also evaluated against parasite kinases. It was possible to identify some highly potent inhibitors on PfCLK1. The aim of second part of this thesis was to optimize the synthetic process to obtain imidazo[4,5-b]pyridines, which are close analogues of roscovitine. Derivatives had proved capable of inhibiting the formation of cysts in a cellular model of polycystic kidney disease. A seven-step synthesis has led to several grams of 3,5,7-trisubstituted imidazo[4,5-b]pyridine which is now available for evaluation in vivo
Dembele, Ousmane. "Design, synthèse et étude biologique de dérivés à structure imidazo[4,5-c]-1,6-naphtyridin-2(1H)-one et analogues structuraux à visée antiproliférative." Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4004.
Full textProtein kinase is a promising target for the treatment of many cancer pathologies. Enzymes effecting phosphorylation of proteins by transferring a phosphate group of ATP to a substrate protein. The latter then makes a conformational change that gives it new functions. If their action is performed on a phenolic amino acid, it will be called tyrosine kinase (TK) but if it is performed on a non-aromatic alcoholic amino acid, it will be called serine / threonine kinase (STK). The inhibition of its activity represents an important stake in the discovery of new anticancer molecules, thanks in particular to the knowledge of their structural organization. The original idea was to build on a marine-based structure to develop a drug discovery work. It was chosen from the structure of the grossularines A and B extracted from a marine tunicate (Dendrodoa grossularia) as a model since we had anteriority in the work on this type of structure. This made it possible to envisage the development of analogues and / or derivatives of these grossularins, with, in series pyridazinoindole, the identification of hits on PI3K or DYRK1A. Our work focuses on the synthesis of new original imidazo-naphthyridinone series molecules and structural analogues potentially inhibitory to kinases. The synthesized compounds were evaluated in parallel by the Roscoff Biological Station on a panel of kinases (HASPIN, CLK1, DYRK1A, CDK5, CDK9, and GSK3α/β and CK1)
Elie, Jonathan. "Développement de médicaments radiopharmaceutiques fluorés pour l'exploration en imagerie moléculaire TEP de la neuroinflammation." Thesis, Tours, 2016. http://www.theses.fr/2016TOUR3302.
Full textCentral nervous system (CNS) disorders as multiple sclerosis, stroke and neurodegenerative diseases (Alzheimer’s and Parkinson’s) lead to inflammatory response in the brain called neuroinflammation. This phenomenon usually should result in limiting the spread of the disease but also repair and regeneration of the affected tissues. Microglia, the main defense of the SNC, which is activated during a neurodegenerative event leading to the production of many factors including neuroprotectors but also pro-inflammatories. This duality of actions will thereby maintain endless vicious circle leading to neuronal death. It would be interesting to understand the neuroinflammation mechanism to better diagnose and treat CNS diseases. There are several molecular targets, among them are the CycloOXygenase 2 (COX-2), an enzyme which allows the formation of prostaglandins from arachidonic acid, which appears early and it is significantly overexpressed in case of neuroinflammation. This enzyme is therefore a good biological target for the development of imaging tools in order to diagnose pathologies in which central inflammatory processes are present in order to improve patient care. Postiron emission tomography (PET) is a very sensitive functional imaging technique that quantifies minute variations in metabolic or molecular activities. This technique requires the use of radiotracers labeled with a beta + emitter
Lavrard-Meyer, Hubert. "Synthèse et fonctionnalisation du motif pyridine-[b]-bicyclique." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1186/document.
Full textBicyclic unsaturated structures containing one or more nitrogen atom appear in a widerange of organic compounds. In particular, the [b]-fused pyridine is a frequent structural motif,with striking biological activities. However, there is still a lack for general methods, withrespect to the reaction conditions or the scope. In order to override these limitations, a newsynthetic procedure for preparation of the pyridine ring starting from ß–aminoacrylonitrile isproposed. This procedure relies on a trichloromethyl-activated alkene.The reactivity of pyrazolo[3,4-b]pyridine, a subclass of [b]-fused pyridine, have beeninvestigated. Some late-stage functionnalization have been developped, relying on palladiumcatalyzed chemistry. Three positions of the pyrazolopyridine core have been arylated, thusgiving access to new structures