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Master's Dissertation
DOI
https://doi.org/10.11606/D.60.2008.tde-02122008-165131
Document
Author
Full name
Pedro Alves Bezerra Morais
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2008
Supervisor
Committee
Carvalho, Ivone (President)
Costa, Fernando Batista da
Okano, Laura Tiemi
Title in Portuguese
Síntese e atividade biológica da 2-desoxiestreptamina
Keywords in Portuguese
Antibióticos Aminoglicosídeos
Doença de Meniere
Síntese 2 -desoxiestreptamina
Abstract in Portuguese
Os antibióticos aminoglicosídeos adquiriram uma posição relevante no cenário terapêutico devido ao interesse na regulação da síntese protéica bacteriana em nível de RNA, uma vez que são ligantes inespecíficos para diversos tipos de RNA bacterianos, como RNA mensageiro, RNA transportador e RNA ribossômico. Esta classe de antibióticos apresenta amplo espectro de ação, particularmente contra bactérias Gram-negativas. Recente abordagem estende o uso dos antibióticos aminoglicosídeos como agentes antivirais devido a sua afinidade de ligação ao RRE-, Rev Responsive Element, e TAR-, Trans-Acting Responsive sequence HIV RNA. Por conseguinte, há uma inibição competitiva envolvendo seus correspondentes ligantes naturais, as proteínas Rev e Tat, interrompendo a replicação, do vírus HIV-tipo 1. Em virtude da importância de derivados simplificados dos antibióticos aminoglicosídeos na busca por derivados vestíbulo-tóxico seletivos ou RNA-ligantes, o presente trabalho propõe a síntese do amino- e carba-açúcar 2-desoxiestreptamina, 16, a qual apresenta um desafio sintético interessante devido à presença de cinco centros estereogênicos contínuos com substituintes em relação trans no anel e pode ser utilizada na construção de moléculas mais complexas A estratégia sintética proposta para preparação do composto meso 2-desoxiestreptamina (16), envolve metodologia inédita e foi desenvolvida em duas rotas sintéticas: (i) preparação do carba-açúcar precursor 46 e (ii) preparação de 16 propriamente dito.
Title in English
Synthesis and biological activity of 2-deoxyestreptamine
Keywords in English
Aminoglycosides antibiotics
Meniere Disease
Synthesis of 2 -deoxyestreptamine
Abstract in English
Aminoglycoside antibiotics received a relevant position in the therapeutic scenario due to the interest in the regulation of bacterial protein synthesis at the RNA-level, since they are a unspecific ligands to several bacterials RNA types, such as mRNA, tRNA and rRNA. These types of antibiotics show a broad spectrum of activity, particulary against gram negative bacteria. New approach extends the use of aminoglycosides as antiviral agents owing to their binding affinity to RRE- Rev Responsive Element and TAR- Trans-Acting Responsive sequence of HIV RNA. Thus, there is a competitive inhibition involving their corresponding natural ligands Rev and Tat proteins, disrupting the HIV-1 virus replication. Regarding the importance of simplified aminoglycoside antibiotics in the search for selective vestibule-toxic derivatives or RNA-ligands, this work focuses on the synthesis of the amino- and carba-sugar 2-deoxyestreptamine, 16, which has an interesting synthetic challenge related to the presence of five continuous stereogenic centre with substituents in trans disposition in the ring, and may be employed in the construction of more complex molecules. The synthetic strategy proposed to prepare meso 2-deoxyestreptamine (16) involves a new methodology and was performed in two synthetic routes: (i) the synthesis of precursory carba-sugar (46) and (ii) the synthesis of (16) properly.
 
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Dissertacao.pdf (1.30 Mbytes)
Publishing Date
2009-01-05
 
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