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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

Síntese e caracterização estrutural de pirazolinil-tolil-sulfonas trialometil substituídas de interesse antimicrobiano / Synthesis and structural characterization of trihalomethyl substituted pyrazolynil-tolylsulfones of antimicrobial interest

Wentz, Alexandre Pereira 02 February 2006 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The present research describes the use of b-alcoxyvynil trihalomethyl ketones [CX3C(O)CR2CR1R, where X= Cl, F; R= OMe, OEt; R1: H, Me, Ph, 4-MePh, 4-MeOPh, 4-BrPh, 4-ClPh, 4-FPh; R2= H, Ph] in the regiospecific synthesis of 16 new 3(4)-alkyl(aryl) substituted 5-trihalomethyl-5-hydroxy-4,5-dihydro-1H-1-tosylpyrazoles. These pyrazolines were obtained from the reaction of b-alcoxyvinyl trihalomethyl ketones with tosyl hydrazine (63-92%). In a following phase, aiming to develop an efficient methodology of dehydration. Two 4-methoxy-4-(4-fluorophenyl)-1,1,1-trihalo-3-buten-2-ones were submitted to the reactions with four dinucleophile: semicarbazide hydrochloride, thiosemicarbazide, methyl hydrazinocarboxylate and 2-furoic hydrazide furnishing, eigth new 1-substituted-3-(4-fluorophenyl)-5-trihalomethyl-5-hydroxy-4,5-dihydro-1H-pyrazoles (63-98%). The dehydration reactions carried out in thionyl chloride/pyridine/benzene gave the best yields of 3-(4-fluorophenyl)-5-trihalomethyl-1H-pyrazoles (41-75%). The inhibitory activities of pyrazolinic compounds were tested using the autobiography technique for bacteria and fungis. The tosyl pyrazolinic compounds exhibit a significant activity for gram-positive bacteria and low activity to fungi. Among the tested compounds, 3-(4-fluorphenyl)-5-hydroxy-5-trifluoromethyl-4,5-dihydro-1H-1-tosylpyrazole exhibited the best inhibitory activity against Staphylococcus aureus (0,78 μg/μL). All the compounds were characterized by spectral and analytical experiments 1H s and 13C s NMR, and the purity was demostrated by elemental analyzes and CG/MS. / O presente trabalho descreve a utilização de b-alcoxivinil trialometil cetonas [CX3C(O)CR2CR1R, onde X: Cl, F; R: OMe, OEt; R1: H, Me, Ph, 4-MePh, 4-MeOPh, 4-BrPh, 4-ClPh, 4-FPh; R2: H, Ph] na síntese regioespecífica de 16 novos 3(4)-alquil(aril)-5-trialometil-5-hidroxi-4,5-diidro-1H-1-tosilpirazois. As tosilpirazolinas foram obtidas a partir da reação das b-alcoxivinil trialometil cetonas com tosilhidrazina (63-92%). Em uma segunda etapa, visando desenvolver uma eficiente metodologia para desidratação das pirazolinas trialometil substituídas. Duas 4-metoxi-4-(4-fluorfenil)-1,1,1-trialo-3-buten-2-onas foram submetidas a reações com quatro dinucleófilos: cloridrato de semicarbazida, tiosemicarbazida, carboximetilhidrazina e 2-furanoilhidrazina, originando inicialmente 8 novos 3-(4-fluorfenil)-5-trialometil-5-hidroxi-4,5-diidro-1H-pirazóis (63-98%). As reações de desidratação realizadas em meio cloreto de tionila/piridina/benzeno produziram os melhores rendimentos para 6 novos 3-(4-fluorfenil)-5-trialometil-1H-pirazóis (41-75%). As atividades inibitórias dos compostos foram avaliadas frente bactérias e fungos, utilizando a técnica de autobiografia. Os compostos tosil pirazolínicos evidenciaram significante atividade frente a bactérias gram-positivas e pouco ativas para fungos. Dentre os compostos avaliados, o composto 3-(4-fluorfenil)-5-hidroxi-5-trifluormetil-4,5-diidro-1H-1-tosilpirazol apresentou o melhor resultado, inibindo o crescimento de Staphylococcus áureus (0,78 μg/μL). Os compostos foram caracterizados por experimentos de RMN de 1H e 13C, e sua pureza determinada via Análise Elementar e CG/MS.

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