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Previous issue date: 2017-02-20 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Chagas disease was studied and described by the Brazilian sanitarist and physician Carlos Chagas in 1909. It is caused by the protozoan Trypanosoma cruzi and presents complex clinical manifestations. However, since its discovery, little progress has been made in the chemotherapeutic treatment of Chagas' disease. The only available drug for its treatment (benzonidazole) is not completely efficient and is associated with the development of several side effects. From the knowledge of the antiparasitic activity of the natural amidic alkaloid piperine, this work focused on the proposition of new structurally-similar molecules with trypanocidal potential. From the principles of bioisosterism, a series of new 1,2,4-oxadiazoles were proposed. Its synthesis was designed from the corresponding 3-arylacrylic acids to give the respective acyl chlorides by reaction with oxalyl chloride. The subsequent step involves O-acylation of the properly substituted benzamidoxime following the cyclization reaction of the oxadiazolic ring, which occurs in solid support (silica gel) using microwave irradiation. The characterization of the products was done by determination of melting points, 1H and 13C NMR, infrared espectrometry and high and low resolution mass spectrometry. The present work also presents information about the biological activity profile of the molecules synthesized against epimastigote forms of the T. cruzi protozoan and against primary mammalian cells, allowing the calculation of their selectivity indexes. Investigations about the possible mechanisms of action of the derivatives on T. cruzi indicate that there are no influences on the enzymatic action of the protease cruazain, on the cell cycle of the parasite or on the biosynthesis of membrane sterols catalyzed by the enzyme CYP51. The developed sinthetic methodology can be applied in the expansion of the series of analogues derivatives. The perspectives of this work also include the biological evaluation against amastigote and trypomastigote forms of the parasite. / A doen?a de Chagas foi estudada e descrita pelo m?dico sanitarista e cientista brasileiro Carlos Chagas, em 1909. ? causada pelo protozo?rio Trypanossoma cruzi, apresentando manifesta??es cl?nicas complexas. No entanto, desde sua descoberta, pouco se avan?ou no tratamento quimioter?pico da doen?a de Chagas, sendo o f?rmaco dispon?vel (benzonidazol) pouco eficiente e associado ? manifesta??o de diversos efeitos colaterais. A partir do conhecimento da atividade antiparasit?ria da amida natural piperina, este trabalho focou-se na proposi??o de novas mol?culas estruturalmente semelhantes com potencial tripanocida. A partir dos princ?pios do bioisosterismo, foi proposta uma s?rie de novos 1,2,4-oxadiaz?is diferentemente substitu?dos. Sua s?ntese foi concebida partir dos ?cidos 3-arilacr?licos correspondentes, obtendo-se os respectivos cloretos de acila, atrav?s da rea??o com cloreto de oxalila. A etapa posterior envolve a O-acila??o da benzamidoxima adequadamente substitu?da, seguida do fechamento do anel oxadiaz?lico, que se d? em em suporte s?lido (s?lica-gel) empregando-se irradia??o de micro-ondas. A caracteriza??o dos produtos foi feita atrav?s de ponto de fus?o, RMN 1H e 13C, espectrometria no infravermelho e espectrometria de massas de alta e baixa resolu??o. O presente trabalho ainda traz informa??es quanto ao perfil de atividade biol?gica das mol?culas sintetizadas frente a formas epimastigotas do protozo?rio Trypanosoma cruzi e frente a c?lulas prim?rias de mam?feros, permitindo que se calculasse o seu ?ndice de seletividade. Investiga??es quanto a poss?veis mecanismos de a??o dos derivados sobre o T. cruzi indicam n?o haver influ?ncias sobre a a??o enzim?tica da protease cruza?na, sobre o ciclo celular do parasito, nem sobre a bioss?ntese de ester?is de membrana, catalisada pela enzima CYP51. A metodologia qu?mica desenvolvida poder? ser aplicada na s?ntese de outros an?logos. As perspectivas deste trabalho incluem ainda a avalia??o biol?gica frente a formas amastigota e tripomastigota do parasito
| Identifer | oai:union.ndltd.org:IBICT/oai:localhost:jspui/2019 |
| Date | 20 February 2017 |
| Creators | Santos, Paulo Pitasse |
| Contributors | Lima, Marco Edilson Freire de, Santiago, Vitor Sueth, Trossini, Gustavo Henrique Goulart, Guedes, Herbert Leonel M. |
| Publisher | Universidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Qu?mica, UFRRJ, Brasil, Instituto de Ci?ncias Exatas |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ |
| Rights | info:eu-repo/semantics/openAccess |
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Acesso em 24 de abril de 2016. https://www.scoppus.com - Pesquisa na base de dados com o termo "Trypanosoma cruzi" junto com os respectivos nomes dos alvos. |
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