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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 de novos adutos de Morita-Baylis-Hillman: bioisosterismo clássico na otimização de leishmanicidas / Synthesis of new adducts of Morita-Baylis-Hillman: bioisosterism classic optimize leishmanicids.

Silva, Fábio Pedrosa Lins 27 November 2009 (has links)
Made available in DSpace on 2015-05-14T13:21:24Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 2922562 bytes, checksum: 9db6c2993f51e11e2568c6fc42b4d668 (MD5) Previous issue date: 2009-11-27 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / This work was designed using the concept of classical bioisosterism where isoelectronic OH groups were replaced by the CH3 group, aimed at finding a relationship between the lipossolubility of the adducts Morita-Baylis-Hillman (AMBH) and its biological activity. Was developed in this work, synthetic methodologies for the preparation of 16 AMBH unprecedented (47-62), getting good and high yields. Initially was synthesized AMBH 8 using the 2-hydroxyethyl Acrylate 45 as Michael acceptor, giving the adducts 47 (2-hydroxyethyl [2-(hydroxy( 2-nitrophenyl)methyl)] acrylate, 71%), 48 (2-hydroxyethyl [2-(hydroxy( 3-nitrophenyl)methyl)] acrylate, 50%), 49 (2-hydroxyethyl [2-(hydroxy(4- nitrophenyl)methyl)] acrylate, 62%), 50 (2-hydroxyethyl [2-(hydroxy(pyridin-2- yl)methyl)] acrylate, 94%), 51 (2-hydroxyethyl [2-(hydroxy(pyridin-3-yl) methyl)] acrylate, 83%), 52 (2-hydroxyethyl [2-(hydroxy(pyridin-4-yl)methyl)] acrylate, 80%), 53 (2-hydroxyethyl [2-((4-bromophenyl)(hydroxy)methyl)] acrylate, 67%), 54 (2-hydroxyethyl [2-(hydroxy(naphthalen-2-yl)methyl)] acrylate, 71%). The second step of the synthesis was the preparation of Propyl Acrylate (46), from acrylic acid and propanol (yield 98%), which was later used as Michael acceptors in the synthesis of AMBH 55 (Propyl [2-(hydroxy(2-nitrophenyl) methyl)] acrylate, 68%), 56 (Propyl [2-(hydroxy(3-nitrophenyl)methyl)] acrylate, 73%), 57 (Propyl [2-(hydroxy(4-nitrophenyl)methyl)] acrylate, 97%), 58 (Propyl [2-(hydroxy(pyridin-2-yl)methyl)]acrylate, 70%), 59 (Propyl [2- (hydroxy(pyridin-3-yl)methyl)acrylate], 80%), 60 (Propyl [2-(hydroxy(pyridin-4- yl)methyl)] acrylate, 66%), 61 (Propyl [2-((4-bromophenyl)(hydroxy)methyl)] acrylate, 64%), 62 (Propyl [2-(hydroxy(naphthalen-2-yl)methyl)] acrylate, 60%). All of these adducts were bioavailiated in vitro against the parasite Leishmania amazonensis, their cytotoxicity in macrophages were studied and their therapeutic indices calculated. Unlike expected, the bioisosteric modification not presented a direct relationship between the lipossolubility (Log P) of these compounds and their biological activity. All adducts showed strong activity antipromastigote, being the compounds 47, 55, 49, 57, 53, 54 and 62 the most actives in L. amazonensis, all with IC50 less than 60μM. Among them the AMBH 47 was the most active and that presented the higher therapeutic index, which is the prototype substance of this work. / Este trabalho foi idealizado utilizando o conceito de bioisosterismo clássico, onde grupos isoeletrônicos OH foram substituídos pelo grupo CH3, visando encontrar uma relação entre a lipossolubilidade dos Adutos de Morita-Baylis- Hillman (AMBH) e sua atividade biológica. Foram desenvolvidos neste trabalho, metodologias sintéticas para a preparação de 16 AMBH inéditos (47-62), em bons a altos rendimentos. Inicialmente foi sintetizado 8 AMBH utilizando o Acrilato de 2-hidroxietila (45) como aceptor de Michael, obtendo os adutos 47(Acrilato de [2-(hidroxi(2-nitrofenil)metil)] de 2-hidroxietila, 71%), 48 (Acrilato de [2-(hidroxi(3-nitrofenil)metil)] de 2-hidroxietila, 50%), 49 (Acrilato de [2-(hidroxi(4-nitrofenil)metil)] de 2-hidroxietila, 62%), 50 (Acrilato de [2-(hidroxi( piridin-2-il)metil)] de 2-hidroxietila, 94%), 51(Acrilato de [2-(hidroxi(piridin- 3-il)metil)] de 2-hidroxietila, 83%), 52 (Acrilato de [2-(hidroxi(piridin-4-il)metil)] de 2-hidroxietila, 80%), 53 (Acrilato de [2-((4-bromofenil)(hidroxi)metil)] de 2- hidroxietila, 67%), 54 (Acrilato de [2-(hidroxi(naftalen-2-il)metil) de 2-hidroxietila, 71%). A segunda etapa de síntese foi a preparação do Acrilato de propila (46), a partir do ácido acrílico e do propanol (rendimento de 98%), que posteriormente foi utilizado como aceptor de Micheal na síntese dos AMBH 55(Acrilato de [2-(hidroxi-(2-nitrofenil)metil)] de propila, 68%), 56 (Acrilato de [2-(hidroxi-(3-nitrofenil)metil)] de propila 73%), 57 (Acrilato de [2-(hidroxi-(4- nitrofenil)metil)] de propila, 97%), 58 (Acrilato de [2-(hidroxi-(piridin-2- il)metil)] de propila, 70%), 59 (Acrilato de [2-(hidroxi-(piridin-3-il)metil)] de propila, 80%), 60 (Acrilato de [2-(hidroxi-(piridin-4-il)metil)] de propila, 66%), 61(Acrilato de [2-((4-bromofenil)(hidroxi)metil)] de propila, 64%), 62 (Acrilato de [2-(hidroxi(nafthalen-2-il)metil)] de propila, 60%). Todos estes adutos foram bioavaliados in vitro contra o parasita Leishmania amazonensis, suas citotoxicidades em macrófagos foram estudadas e seus índices terapêuticos calculados. Diferentemente do esperado, a modificação bioisostérica não apresentou uma relação direta entre a lipossolubilidade (Log P) destes compostos e a sua atividade biológica. Todos os adutos apresentaram forte atividade antipromastigota, sendo os compostos 47, 55, 49, 57, 53, 54 e 62 os mais ativos em L. amazonensis, todos com IC50 menores que 60QM. Entre eles o AMBH 47 foi o mais ativo e o que apresentou o maior índice terapêutico, sendo este a substância protótipo deste trabalho.

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