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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

Preparação e avaliação biológica de eletrófilos insaturados : nitroestirenos e ésteres

Morello, Glauciana França January 2015 (has links)
Orientador: Prof. Dr. Rodrigo Luiz Oliveira Rodrigues Cunha / Dissertação (mestrado) - Universidade Federal do ABC. Programa de Pós-Graduação em Ciência e Tecnologia/Química, 2015. / Organocalcogenetos sao importantes reagentes e intermediarios em sintese organica tendo especial destaque a preparacao e aplicacoes dos derivados vinilicos. Outro ambito com nascente potencial consiste no estudo de propriedades biologicas de derivados organicos contendo grupos funcionais com os atomos de Selenio ou Telurio. Os derivados hipervalentes destes compostos sao inibidores de cisteina proteases envolvidas em diversas patologias por isso sao alvos como cancer, mal de Alzheimer, e doencas causadas por parasitas (malaria, doenca de Chagas, leishmaniose, por exemplo). Para a obtencao desta classe de compostos sao descritas diversas metodologias, entretanto, alguns destes metodos requerem elevadas temperaturas e pressao, varias etapas reacionais, longos tempos reacionais, e baixos rendimentos, dificultando com isso, a sintese destes compostos. O presente estudo visa a obtencao de organocalcogenetos vinilicos derivados de acidos carboxilicos ¿¿,¿À-insaturados para o estudo de sua reatividade frente a tiois e inibicao de cisteina proteases. Embora nao tenha sido exitosa a preparacao dos derivados calcogenados, uma serie de nitro-olefinas, foi testada como inibidores de cisteina proteases e outras proteases tiol-dependentes. Os experimentos realizados permitiram a verificacao de que estes compostos sao capazes de atuarem como inibidores de cisteina proteases e de proteases cuja atividade catalitica seja dependente de tiois. / Organic chalcogenides are useful reagents and intermediates in organic synthesis with special emphasis on the applications of vinyl derivatives. Another brach of investigation lies on the study of biological properties of organochalcogenides. The study the biological properties of organic derivatives with functional groups containing selenium or tellurium atoms hypervalent derivatives of these compounds are inhibitors of cysteine proteases involved in several pathologies, therefore are targets such as cancer Alzheimer's disease bad, and diseases caused by parasites (Malaria, Chagas disease, leishmaniasis, for example). For this class of compounds are described several methods, however, some of these methods require high temperatures and pressures, various reaction steps, long reaction times and low yields, makes difficult the synthesis of these compounds. This study aims to obtain organic chalcogenides vinylic derived from á, â-unsaturated carboxylic acids to the study of his face thiol reactivity and inhibiting cysteine proteases. A series of nitro-olefins or papain was tested as inhibitors of cysteine proteases using as a template. The experiments led to the discovery that these compounds are capable of being enzyme inhibitors.

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