RESUMO
Lead compound 1 was successfully redesigned to provide compounds with improved pharmacokinetic profiles for this series of human urotensin-II antagonists. Replacement of the 2-pyrrolidinylmethyl-3-phenyl-piperidine core of 1 with a substituted N-methyl-2-(1-pyrrolidinyl)ethanamine core as in compound 7 resulted in compounds with improved oral bioavailability in rats. The relationship between stereochemistry and selectivity for hUT over the kappa-opioid receptor was also explored.
Assuntos
Química Farmacêutica/métodos , Urotensinas/antagonistas & inibidores , Administração Oral , Animais , Encéfalo/metabolismo , Cromatografia Líquida de Alta Pressão , Diaminas/química , Desenho de Fármacos , Humanos , Concentração Inibidora 50 , Modelos Químicos , Ratos , Receptores Opioides kappa/química , Estereoisomerismo , Relação Estrutura-Atividade , Urotensinas/químicaRESUMO
This work describes the development of potent and selective human Urotensin-II receptor antagonists starting from lead compound 1, (3,4-dichlorophenyl)methyl{2-oxo-2-[3-phenyl-2-(1-pyrrolidinylmethyl)-1-piperidinyl]ethyl}amine. Several problems relating to oral bioavailability, cytochrome P450 inhibition, and off-target activity at the kappa opioid receptor and cardiac sodium channel were addressed during lead development. hUT binding affinity relative to compound 1 was improved by more than 40-fold in some analogs, and a structural modification was identified which significantly attenuated both off-target activities.