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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

Planejamento, síntese, biotransformação e avaliação farmacológica de novos candidatos a protótipos de fármacos antipsicóticos / Planning, synthesis, biotransformation and pharmacological evaluation of new candidate prototype antipsychotic drugs

SILVA, Mirella Andrade 30 August 2010 (has links)
Made available in DSpace on 2014-07-29T16:11:49Z (GMT). No. of bitstreams: 1 Dissertacao Mirella Andrade Silva.pdf: 1517982 bytes, checksum: 99f0cad4e4b2481f30515d779e2b3256 (MD5) Previous issue date: 2010-08-30 / In the scope of a research program that aim the design, synthesis and pharmacological evaluation of new lead-compounds, we will describe in this work the design of new N-phenylpiperazines derivatives originally designed from clozapine (27) and LASSBio 579 (40) that shows antagonist profile in dopaminergic receptors. The compound 1-(4-nitrophenyl)-4-((1-phenyl-1H-pyrazol-4-yl)methyl)piperazine (45) was submitted to in vitro pharmacology assay in brain rat tissues to evaluate the inhibitory activity of D2 dopaminergic receptors and 5-HT2A and 5-HT1A serotonergic. Besides synthetic and pharmacological works its realized biotransformation studies using filamentous fungi and resulted lower number of metabolites than previous studies of (40) biotransformation. Was observed a p-hydroxylated metabolites in the aromatic ring A of 1-(4-methoxyphenyl)-4-((1-phenyl-1H-pyrazol-4- yl)methyl)piperazine (44) and 1-(4-nitrophenyl)-4-((1-phenyl-1H-pyrazol-4- yl)methyl)piperazine (45) were isolated and purified. We concluded that substitution of the D ring contributes to protect from enzymatic metabolism, confirmed by lower number of produced metabolites by biotransformation of the compound (40) . In work, we concluded that the structural design and the synthetic methodology used was validated through structural characterization, but the compounds not show inhibitory profile of dopaminergics (D2) and serotonergics receptors (5-HT2A e 5-HT1A) in front of the reference atypical antipsychotic. / No âmbito de uma linha de pesquisa que visa o planejamento, a síntese e a avaliação farmacológica de novos candidatos a protótipos de fármacos antipsicóticos descreveremos neste trabalho o planejamento de novos derivados Nfenilpiperazínicos (44) e (45), originalmente desenhados a partir da clozapina (27) e do LASSBio 579 (40) que apresenta perfil antagonista de receptores dopaminérgicos D2. O composto 1-(4-nitrofenil)-4-((1-fenil-1H-pirazol-4-il)metil)piperazina (44) foi submetido ao ensaio farmacológico in vitro em cérebro de ratos visando avaliar a atividade de antagonismo dos receptores dopaminérgicos D2 e serotonérgicos 5- HT2A e 5-HT1A. Paralelamente ao trabalho sintético e farmacológico foram realizados estudos de bioconversão utilizando fungos filamentosos e obtivemos número de metabólitos em quantidade inferior àqueles obtidos pela bioconversão dos compostos LASSBio 579 (40). Foram isolados e caracterizados 4-(4-((4-(4- nitrofenil)piperazin-1-il)metil)-1H-pirazol-1-il)fenol (72) o metabólito 4-(4-((4-(4- metoxifenil)piperazin-1-il)metil)-1H-pirazol-1-il)fenol (75) obtidos através da hidroxilação no anel aromático A dos compostos (44) e (45). Concluímos que a proteção do anel D contribuiu para diminuição do metabolismo, comprovado pelo menor número de metabólitos produzidos pela bioconversão dos candidatos a protótipos de fármacos (44) e (45). Portanto, o planejamento estrutural e a metodologia sintética empregada no mesmo foram validados através da caracterização estrutural, porém os mesmos não apresentaram afinidade pelos receptores dopaminérgicos (D2) e serotonérgicos (5-HT2A e 5-HT1A) frente aos antipsicóticos atípicos de referência.

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