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1.
Bioorg Med Chem ; 24(21): 5462-5480, 2016 11 01.
Artigo em Inglês | MEDLINE | ID: mdl-27658798

RESUMO

Multitarget approaches, i.e., addressing two or more targets simultaneously with a therapeutic agent, are hypothesized to offer additive therapeutic benefit for the treatment of neurodegenerative diseases. Validated targets for the treatment of Parkinson's disease are, among others, the A2A adenosine receptor (AR) and the enzyme monoamine oxidase B (MAO-B). Additional blockade of brain A1 ARs may also be beneficial. We recently described 8-benzyl-substituted tetrahydropyrazino[2,1-f]purinediones as a new lead structure for the development of such multi-target drugs. We have now designed a new series of tetrahydropyrazino[2,1-f]purinediones to extensively explore their structure-activity-relationships. Several compounds blocked human and rat A1 and A2AARs at similar concentrations representing dual A1/A2A antagonists with high selectivity versus the other AR subtypes. Among the best dual A1/A2AAR antagonists were 8-(3-(4-chlorophenyl)propyl)-1,3-dimethyl-6,7,8,9-tetrahydropyrazino[2,1-f]purine-2,4(1H,3H)-dione (41, Ki human A1: 65.5nM, A2A: 230nM; Ki rat A1: 352nM, A2A: 316nM) and 1,3-dimethyl-8-((2-(thiophen-2-yl)thiazol-4-yl)methyl)-6,7,8,9-tetrahydropyrazino[2,1-f]purine-2,4(1H,3H)-dione (57, Ki human A1: 642nM, A2A: 203nM; Ki rat A1: 166nM, A2A: 121nM). Compound 57 was found to be well water-soluble (0.7mg/mL) at a physiological pH value of 7.4. One of the new compounds showed triple-target inhibition: (R)-1,3-dimethyl-8-(2,1,3,4-tetrahydronaphthalen-1-yl)-6,7,8,9-tetrahydropyrazino[2,1-f]purine-2,4(1H,3H)-dione (49) was about equipotent at A1 and A2AARs and at MAO-B (Ki human A1: 393nM, human A2A: 595nM, IC50 human MAO-B: 210nM) thus allowing future in vivo explorations of the intended multi-target approach.


Assuntos
Antagonistas do Receptor A2 de Adenosina/farmacologia , Inibidores da Monoaminoxidase/farmacologia , Monoaminoxidase/metabolismo , Purinas/farmacologia , Pirazinas/farmacologia , Receptor A2A de Adenosina/metabolismo , Antagonistas do Receptor A2 de Adenosina/síntese química , Antagonistas do Receptor A2 de Adenosina/química , Animais , Células CHO , Cricetulus , Relação Dose-Resposta a Droga , Humanos , Estrutura Molecular , Inibidores da Monoaminoxidase/síntese química , Inibidores da Monoaminoxidase/química , Purinas/síntese química , Purinas/química , Pirazinas/síntese química , Pirazinas/química , Ratos , Solubilidade , Relação Estrutura-Atividade , Água/química
2.
ChemMedChem ; 7(12): 2087-92, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23042668

RESUMO

The simpler, the better: H(3) histamine receptor (H(3)R) are of interest as therapeutic targets in cognitive and somnolence disorders. Here, lead optimization of H(3)R inverse agonists bearing a thiazolo[5,4-c]piperidine group gave rise to a clinical candidate with a much simpler unprecedented benzamide scaffold, displaying decreased hERG activity while maintaining high brain receptor occupancies.


Assuntos
Agonistas dos Receptores Histamínicos/química , Agonistas dos Receptores Histamínicos/farmacologia , Piperidinas/química , Piperidinas/farmacologia , Receptores Histamínicos H3/metabolismo , Animais , Benzamidas/química , Benzamidas/farmacocinética , Benzamidas/farmacologia , Células CACO-2 , Agonistas dos Receptores Histamínicos/farmacocinética , Humanos , Masculino , Piperidinas/farmacocinética , Ratos , Ratos Wistar , Relação Estrutura-Atividade , Tiazóis/química , Tiazóis/farmacocinética , Tiazóis/farmacologia , Transativadores/metabolismo , Regulador Transcricional ERG
8.
Bioorg Med Chem Lett ; 17(12): 3262-5, 2007 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-17459702

RESUMO

The synthesis and structure-activity relationships against the C3a receptor of a series of substituted aminopiperidine derivatives are reported. DMPK properties and functional activities of selected compounds are described. The compounds obtained are the first non-arginine ligands of C3aR.


Assuntos
Aminas/química , Ativação do Complemento/efeitos dos fármacos , Proteínas de Membrana/metabolismo , Piperidinas/farmacologia , Receptores de Complemento/metabolismo , Animais , Ligantes , Camundongos , Camundongos Endogâmicos BALB C , Piperidinas/síntese química , Ligação Proteica , Proteínas Serina-Treonina Quinases/metabolismo , Relação Estrutura-Atividade
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