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dc.contributor.authorFerreira, Larissa de Almeida Peixoto-
dc.date.accessioned2026-08-31T16:56:03Z-
dc.date.available2026-08-31T16:56:03Z-
dc.date.issued2026-04-17-
dc.identifier.citationFERREIRA, Larissa. Síntese e avaliação de derivados cumarínicos planejados como moduladores de receptores de histamina H3, inibidores de colinesterase e MAO-B para o tratamento da Doença de Alzheimer. 2026. 268 f. Tese (Doutorado em Química) - Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2026.pt_BR
dc.identifier.urihttp://rima.ufrrj.br/jspui/handle/20.500.14407/26283-
dc.description.abstractA doença de Alzheimer (DA) é considerada um transtorno neurodegenerativo multifatorial, para o qual diversos estudos têm se concentrado no desenvolvimento de compostos multialvo, visando à obtenção de terapias mais eficazes. Nesse contexto, o presente trabalho descreve a síntese e avaliação farmacológica de derivados cumarínicos funcionalizados com substituintes aromáticos, heteroaromáticos e alifáticos, planejados como compostos multialvo com potencial para modulação do receptor de histamina H3 (H3R), além da inibição de colinesterases (ChEs) e da monoamina oxidase B (MAO-B), como estratégia terapêutica para a modulação da DA. A síntese dos compostos foi organizada em cinco séries distintas, baseadas em variações estruturais do núcleo cumarínico. Para a obtenção das moléculas alvo foram empregadas metodologias clássicas, como as reações de Knoevenagel, Pechmann e Perkin, além de reações de acoplamento cruzado, como Suzuki–Miyaura e Buchwald–Hartwig, permitindo a introdução dos substituintes desejados. Ao todo, foram sintetizados trinta e seis compostos finais, os quais foram submetidos à avaliação farmacológica frente ao H3R, ChE e MAO-B, além de ensaios de citotoxicidade em células de neuroblastoma humano SH-SY5Y. Os compostos sintetizados apresentaram resultados promissores, com afinidade pelo hH3R variando entre 12 e 299 nM, inibição das ChEs com valores de CI50 entre 300 e 5000 nM para AChE e entre 647 e 7000 nM para BChE, além de inibição seletiva frente à MAO-B, com valores de CI50 entre 70 e 4521 nM. Adicionalmente, os compostos não apresentaram citotoxicidade significativa em células SH-SY5Y, demonstrando viabilidade celular superior a 90% na concentração de 10 μM. Com base nesses resultados, foram realizados estudos de relação estrutura–atividade (SAR), bem como avaliações in silico por docking molecular e predição de propriedades farmacocinéticas. Dentre os compostos avaliados, foi identificado o composto multialvo promissor 51n (hH3R Ki = 163 nM; eeAChE CI50 = 74 nM; MAO-B CI50 = 75,6 nM). Além disso, os compostos 61e, 61f, 75a e 75b apresentaram excelente atividade dual frente ao hH3R e eeAChE, com valores na faixa de um a dois dígitos nanomolar. Destaca-se ainda o composto 61c, que apresentou maior seletividade para o hH3R (Ki = 12 nM), associada a uma substituição estrutural ainda não descrita na literatura. Os resultados obtidos demonstram o potencial dos derivados cumarínicos desenvolvidos como candidatos promissores para a modulação multialvo da doença de Alzheimer, contribuindo para o avanço no desenvolvimento de novas estratégias terapêuticas para doenças neurodegenerativaspt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESpt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal Rural do Rio de Janeiropt_BR
dc.subjectCumarinaspt_BR
dc.subjectmultialvopt_BR
dc.subjectcolinesterasept_BR
dc.subjectMonoamina oxidase-Bpt_BR
dc.subjectreceptores de histamina H3pt_BR
dc.subjectCoumarinspt_BR
dc.subjectmultitarget ligandspt_BR
dc.subjectcholinesterasept_BR
dc.subjectmonoamine oxidase Bpt_BR
dc.subjecthistamine H3 receptorspt_BR
dc.titleSíntese e avaliação de derivados cumarínicos planejados como moduladores de receptores de histamina H3, inibidores de colinesterase e MAO-B para o tratamento da Doença de Alzheimerpt_BR
dc.title.alternativeSynthesis and evaluation of coumarin derivatives designed as histamine H3 receptor modulators, cholinesterase inhibitors, and MAO-B inhibitors for the treatment of Alzheimer’s diseaseen
dc.typeTesept_BR
dc.description.abstractOtherAlzheimer’s disease (AD) is considered a multifactorial neurodegenerative disorder, for which numerous studies have focused on the development of multitarget compounds aiming at more effective therapeutic strategies. In this context, the present work describes the synthesis and pharmacological evaluation of coumarin derivatives functionalized with aromatic, heteroaromatic, and aliphatic substituents, designed as multitarget ligands with potential to modulate the histamine H3 receptor (H3R), as well as to inhibit cholinesterases (ChEs) and monoamine oxidase B (MAO-B), as a therapeutic strategy for the modulation of AD.The synthesis of the compounds was organized into five distinct series, based on structural variations of the coumarin core. Classical synthetic methodologies were employed for the preparation of the target molecules, including Knoevenagel, Pechmann, and Perkin reactions, as well as cross-coupling reactions such as Suzuki–Miyaura and Buchwald–Hartwig, enabling the introduction of the desired substituents. In total, thirty-six final compounds were synthesized and subjected to pharmacological evaluation against H3R, ChEs, and MAO-B, in addition to cytotoxicity assays in human neuroblastoma SH-SY5Y cells. The synthesized compounds showed promising results, displaying affinity for hH3R ranging from 12 to 299 nM, ChE inhibition with IC50 values between 300 and 5000 nM for AChE and between 647 and 7000 nM for BChE, as well as selective inhibition toward MAO-B, with IC50 values ranging from 70 to 4521 nM. Furthermore, the compounds did not show significant cytotoxicity in SH-SY5Y cells, maintaining cell viability above 90% at 10 μM. Based on these results, structure–activity relationship (SAR) studies were conducted, along with in silico molecular docking analyses and prediction of pharmacokinetic properties. Among the evaluated compounds, the multitarget compound 51n was identified as a promising candidate (hH3R Ki = 163 nM; eeAChE IC50 = 74 nM; MAO-B IC50 = 75.6 nM). In addition, compounds 61e, 61f, 75a, and 75b exhibited excellent dual activity toward hH3R and eeAChE, with potencies in the one- to two-digit nanomolar range. Notably, compound 61c showed higher selectivity for hH3R (Ki = 12 nM), associated with a structural substitution not previously reported in the literature. Overall, the obtained results demonstrate the potential of the developed coumarin derivatives as promising multitarget candidates for Alzheimer’s disease modulation, contributing to the advancement of new therapeutic strategies for neurodegenerative disordersen
dc.contributor.advisor1Kümmerle, Arthur Eugen-
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/5598000938584486pt_BR
dc.contributor.advisor-co1Stark, Holger-
dc.contributor.advisor-co1Lattes-pt_BR
dc.contributor.referee1Kümmerle, Arthur Eugen-
dc.contributor.referee1Latteshttp://lattes.cnpq.br/5598000938584486pt_BR
dc.contributor.referee2Lima, Marco Edilson Freire de-
dc.contributor.referee2IDhttps://orcid.org/0000-0003-0563-3483pt_BR
dc.contributor.referee2Latteshttp://lattes.cnpq.br/8392420706762318pt_BR
dc.contributor.referee3Lima, Lidia Moreira-
dc.contributor.referee3IDhttps://orcid.org/0000-0002-8625-6351pt_BR
dc.contributor.referee3Latteshttp://lattes.cnpq.br/3986190995983234pt_BR
dc.contributor.referee4Regasini, Luis Octavio-
dc.contributor.referee4IDhttps://orcid.org/0000-0001-8574-0670pt_BR
dc.contributor.referee4Latteshttp://lattes.cnpq.br/0992736452764550pt_BR
dc.contributor.referee5Fernandes, João Paulo dos Santos-
dc.contributor.referee5IDhttps://orcid.org/0000-0002-9089-273Xpt_BR
dc.contributor.referee5Latteshttp://lattes.cnpq.br/7259164526317967pt_BR
dc.creator.IDhttps://orcid.org/0000-0002-7835-6176pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/6900569101255090pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentInstituto de Químicapt_BR
dc.publisher.initialsUFRRJpt_BR
dc.publisher.programPrograma de Pós-Graduação em Químicapt_BR
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