2014-09-092014-09-092009-06-30QUEIROZ, Auriekson Noronha. Planejamento de novos derivados da Edaravona. 2009. 71 f. Dissertação (Mestrado) - Universidade Federal do Pará, Instituto de Ciências da Saúde, Belém, 2009. Programa de Pós-Graduação em Ciências Farmacêuticas.https://repositorio.ufpa.br/handle/2011/5640A detailed theoretical study of the edaravone was carried out by DFT method using B3LYP/6-31G* basis set, with the objective to clarify the scavenging mechanism and influence of edaravone tautomerism under acid condition, which will be helpful to elucidate the radical-scavenging mechanisms in the ischemic process. Previous theoretical studies, tautomerization, solvent effects, and electron abstraction no were considered. In this work, the stability and reactivity were determined through geometric and energetic parameters were realized in gas phase and PCM methods in water and methanol. The acid or basic conditions were considered by bond dissociation or protonation energies may undergo anion or cation products, respectively. The antioxidant properties were calculated through HOMO, ionization potential (IP), and bond dissociation energies (BDE). HOMO and IP values showed that N-H tautomer is better antioxidant by electron abstraction, while BDE values showed that O-H tautomer is better antioxidant by hydrogen abstraction. The protonation is thermodynamically more favored than deprotonation. Furthermore, the protonation energy explain, theoretical, the reduced difference between N and O protonation. The protonation is thermodynamically more favored than deprotonation. The solvent effect decreased energies barriers to isomerization in O-H or N-H tautomers. In addition, three pyrazolone derivatives were evaluated its antioxidant activities comparated to edaravone, in an effort to develop the evaluated and pharmacophore antioxidant identification. The antioxidant activity of antypirine, dypirone, phenylbuthazone and edaravone was determined measuring the inhibition of two stables free radical DPPH and ABTS. Edaravone and phenylbuthazone exhibited more potent inhibition of DPPH and ABTS radical scavenging than dypirone, while antypirine not shown activity in all concentrations analyzed. Simultaneously, the DFT method can provide an antioxidant potential value to explain the structure-activity relationship (SAR). Furthermore, was evaluated their antioxidant activities and the ionization potential, HOMO, BDE X-H, and stabilization energies (DEiso) of the compounds have been calculated using the density functional theory (DFT) method at the B3LYP level, employing the 6-31G(d) basis set, to explore the SAR. All calculations have been performed by using the Gaussian 03 program, Hyperchem 7.5, and ChemOffice 2005. The results showed that derivatives with C-H in 4-position increased electron or hydrogen abstraction. Finality, the general strategy employed to design the target compounds was based on the studies of eighteen derivatives of edaravone. The SAR studies supported the three groups, such as more active, active and less active. Nine compounds were design with successful based in the structure of more active.porAcesso AbertoEdaravonaTeoria do funcional da densidadeABTSDPPHAntioxidantesDissertaçãoCNPQ::CIENCIAS DA SAUDE::FARMACIA::ANALISE E CONTROLE E MEDICAMENTOS