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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Elaboration de nouveaux inhibiteurs mixtes ECA/ECE pour le traitement de l'hypertension

Gomez, Catherine 08 February 2008 (has links) (PDF)
Les inhibiteurs mixtes de l'ECE et de l'ECA constituent une classe thérapeutique originale qui intervient dans la régulation de l'hémodynamique, en bloquant en amont la production de puissants vasoconstricteurs tels que l'angiotensine II et l'endothéline-1. Ces deux peptides sont générés, respectivement, grâce à l'enzyme de conversion de l'angiotensine II et de l'endothéline-1. En inhibant leur action, les agents thérapeutiques mixtes récents (1970) prennent ainsi une part importante dans le traitement de l'hypertension. Le premier type d'inhibiteurs porte un groupement phosphoré qui se lie au zinc présent dans le site actif de l'enzyme. Ces composés peptidiques, qui possèdent une certaine stéréochimie, ont été synthétisés via des réactions de substitution, de couplage peptidique et d'hydrogénolyse. Les premiers résultats pharmacologiques montrent que seule une activité vis à vis de l'enzyme de conversion de l'angiotensine est décelée. La seconde partie de ce travail présente la synthèse de dérivés cycliques, constitués de cinq ou six chaînons, et qui assurent une chélation au zinc grâce aux groupements carbonyles. Ces molécules sont obtenues en fonctionnalisant l'acide barbiturique ainsi que l'hydantoïne. Grâce à des réactions d'acylation et d'alkylation notamment, un premier composé final a pu être généré mais son inhibition, testée sur l'ECA, est encore faible et nécessite des modulations pour converger vers une activité mixte.
2

Estudos químicos e biológicos de compostos heterocíclicos derivados dos núcleos imidazolidina-2,4-diona e 2-tioxoimidazolidina-4-ona

Souza, Severino Araújo de 06 April 2015 (has links)
Submitted by Maike Costa (maiksebas@gmail.com) on 2017-06-27T14:51:56Z No. of bitstreams: 1 arquivototal.pdf: 8326748 bytes, checksum: beabc8048bb16f0e1b36cca198214348 (MD5) / Made available in DSpace on 2017-06-27T14:51:56Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 8326748 bytes, checksum: beabc8048bb16f0e1b36cca198214348 (MD5) Previous issue date: 2015-04-06 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / The breakthrough occurred in the scientific world involving chemical and pharmacological studies of heterocyclic are the result of the large investment from pharmaceutical companies and research centers in universities. Synthetic Heterocyclic compounds stand out because of the possibilities these compounds present several different biological properties. Structural changes in imidazolidínico and tioimidazolidínico rings can change their chemical, physical properties and produce biological effects with a variety of useful applications. The objective of this work was the synthesis and characterization of heterocyclic compounds of imidazolidine-2,4-dione class and 2-thioxo-imidazolidine-4-one in order to investigate their pharmacological potential as antimicrobial, antinociceptive, anti-tumor and anticonvulsant and study their thermal stability. The compounds were obtained in two steps: first, reacted sodium cyanide, ammonium chloride, methylammonium chloride, isopropylammonium chloride and substituted aromatic aldehydes to, followed by acid hydrolysis to form the amino acid derivatives of glycine. In the second stage, there was the reaction of amino acids prepared with potassium isocyanate and ammonium isothiocyanate and / or phenyl isocyanate and / or phenyl isothiocyanate followed by acid hydrolysis to form the imidazolidínicos derivatives: IM-15; HPA-05; HPA-09; HPA-10; HPA-14; HPA-15A; HPA-15B; HPA-15C; HPA-15D; HPA-15E; HPA-15F; HPA-15G; HPA-15H; HPA-15J and tioimidazolidínicos: HPA-03; HPA-04; HPA-08; HPA-11; HPA-15I; HPA-15M. The structures of the synthesized compounds were characterized by IR absorption spectroscopy, 1H-NMR and 13C-NMR. With the synthesized compounds investigated the potential front Antimicrobial studies, antinociceptive, anticarcinogenic and CNS. Also evaluated the thermal stability of the synthesized compounds and in silico studies. / O grande avanço ocorrido no mundo científico envolvendo os estudos químicos e farmacológicos de heterocíclicos são frutos do grande investimento das indústrias farmacêuticas e dos centros de pesquisas nas universidades. Os compostos heterocíclicos sintéticos se destacam devido às possibilidades existentes nesses compostos de apresentar várias propriedades biológicas diferentes. Modificações estruturais nos anéis imidazolidínico e tioimidazolidínico podem alterar suas propriedades químicas, físicas e produzir efeitos biológicos com uma grande variedade de aplicações úteis. O objetivo desse trabalho foi a síntese e caracterização de compostos heterocíclicos da classe imidazolidina-2,4-diona e 2-tioxo-imidazolidina-4-ona com a finalidade de investigar suas potencialidades farmacológicas como antimicrobianos, antinociceptivos, antitumoral e anticonvulsivante e estudar sua estabilidade térmica. Os compostos foram obtidos em duas etapas: na primeira, fez-se reagir cianeto de sódio, cloreto de amônio, cloreto de metilamônio, cloreto de isopropilamônio e aldeídos aromáticos para substituídos, seguido de hidrólise ácida para a formação dos aminoácidos derivados da glicina. Na segunda etapa, fez-se a reação dos aminoácidos preparados com isocianato de potássio e isotiocianato de amônio e/ou fenilisocianato e/ou fenilisotiocianato seguido de hidrólise ácida formando os derivados imidazolidínicos: IM-15; HPA-05; HPA-09; HPA-10; HPA-14; HPA-15A; HPA-15B; HPA-15C; HPA-15D; HPA-15E; HPA-15F; HPA-15G; HPA-15H; HPA-15J e tioimidazolidínicos: HPA-03; HPA-04; HPA-08; HPA-11; HPA-15I; HPA-15M. As estruturas dos compostos sintetizados foram caracterizadas através da espectroscopia de absorção no IV, de RMN de 1H e RMN de 13C. Com os compostos sintetizados investigou a potencialidade frente aos estudos Antimicrobianos, Antinociceptivos, Anticarcinogênico e sobre o SNC. Avaliou também a estabilidade térmica dos compostos sintetizados e os estudos in silico.
3

Totalsynthese der Mansouramycine A-E aus Streptomyces sp. und Rhodium-katalysierte 1,2-Additionen an cyclische Enone / Total synthesis of Mansouramycine A-E from streptomyces sp. and rhodium catalized 1,2-additions to cyclic enones

Beerlink, Johannes 14 October 2008 (has links)
No description available.

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