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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

Estudos sintéticos visando à preparação da caramboxina, um alfa-aminoácido com potencial atividade biológica / Synthetic studies aimed at preparation of caramboxina, an alpha-amino acid with potential biological activity.

Bozzini, Leandro Alves 12 June 2015 (has links)
Em 2005, Carolino e colaboradores isolaram uma fração neurotóxida de Averrhoa carambola (carambola) que foi capaz de apresentar sintomas em ratos e camundongos e foi chamada de AcTx. Acredita-se que o aminoácido denominado caramboxina esteja presente nesta fração e seja o metabólito secundário responsável por envenenamento pela ingestão da fruta em pacientes com insuficiência renal crônica. Apesar da estrutura da caramboxina ter sido elucidada por análises espectrométricas, a síntese deste composto visando caracterização estrutural e análise biológica ainda não havia sido realizada. Assim o objetivo deste trabalho foi investigar a síntese total da caramboxina visando sua caracterização estrutural e análise biológica dos compostos obtidos. Quatro rotas foram propostas, três das quais fizeram uso de reagentes organometálicos. Aquela que não fez uso de reagentes organometálicos foi a que se mostrou mais eficiente. / In 2005, Carolino and co-workers isolated a neurotoxic fraction of Averrhoa carambola (star fruit) that was able to cause seizures in rats and mice and was named AcTx. It is believed that the amino acid caramboxine, present in this fraction, is one of the secondary metabolites responsible for poisoning by fruit intake by patients with chronic renal failure. Despite its structure has been elucidated by spectrometric analysis, the synthesis of this compound aiming structural characterization and biological evaluation has not been still accomplished. Thus, the objective of this project was the total synthesis of caramboxina aiming their structural characterization and biological testing of the compounds obtained. Four routes have been proposed and investigated, three of them using organometallic reagents. The route that didn\'t use organometallic intermediates appeared to be the most efficient.

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