RESUMO
A series of N-substituted trans-3,4-dimethyl-4-(3-hydroxyphenyl)piperidines, mu opioid receptor antagonists, analogs of alvimopan, were prepared using solid phase methodology. This study led to the identification of a highly selective mu opioid receptor antagonist, which interacts selectively with mu peripheral receptors.
Assuntos
Sistema Nervoso Central/efeitos dos fármacos , Piperidinas/química , Piperidinas/farmacologia , Receptores Opioides delta/antagonistas & inibidores , Receptores Opioides kappa/antagonistas & inibidores , Receptores Opioides mu/antagonistas & inibidores , Administração Oral , Animais , Membrana Celular/metabolismo , Cromatografia Líquida de Alta Pressão , Diprenorfina/metabolismo , Trânsito Gastrointestinal/efeitos dos fármacos , Guanosina 5'-O-(3-Tiotrifosfato)/metabolismo , Humanos , Loperamida/farmacologia , Camundongos , Estrutura Molecular , Piperidinas/síntese química , Receptores Opioides delta/metabolismo , Receptores Opioides kappa/metabolismo , Receptores Opioides mu/metabolismo , Relação Estrutura-AtividadeRESUMO
The series of trans-3,4-dimethyl-4-(3-hydroxyphenyl)piperidines have been widely investigated as opioid receptor antagonists. One of our research goals was to explore the bioactive conformation of the N-phenethyl trans-3,4-dimethyl-4-(3-hydroxyphenyl)piperidine derivative 3, prototypical mu-opioid antagonist in this series. In this effort, the rotational degrees of freedom of the N-substituent of 3 were limited by incorporation of an ethylene bridge between the piperidine 2- or 6-position of 3 and the benzylic position of the N-phenethyl moiety. The overall modification led to a novel series of fused bicyclic derivatives of the octahydroquinolizine chemical class, conformationally restricted analogue of 3. The constrained analogues 6 and 9 showed high affinity toward the mu-opioid receptor. Compound 6 was found to be a mu-opioid antagonist, whereas the constrained analogue 9 displayed potent mu-agonist activity in vitro. This study provides additional information about the molecular determinants for mu recognition, the structural features affecting ligand binding, and the structure function relationships.
Assuntos
Piperidinas/síntese química , Receptores Opioides mu/antagonistas & inibidores , Animais , Células CHO , Cricetinae , Cricetulus , Cristalografia por Raios X , Guanosina 5'-O-(3-Tiotrifosfato)/metabolismo , Humanos , Ligantes , Modelos Moleculares , Conformação Molecular , Piperidinas/química , Piperidinas/farmacologia , Ensaio Radioligante , Receptores Opioides mu/metabolismo , Estereoisomerismo , Relação Estrutura-AtividadeRESUMO
To better understand structural requirements for a mu ligand of the trans-3,4-dimethyl-4-(3-hydroxyphenyl)piperidine class to interact with the mu opioid receptor, we have described in the previous article (Le Bourdonnec, B. et al. J. Med. Chem. 2006, 25, 7278-7289) new, constrained analogues of the N-phenethyl derivative 3. One of the active constrained analogues, compound 4, exhibited subnanomolar mu-opioid receptor affinity (K(i) = 0.62 nM) and potent mu-opioid antagonist activity (IC(50) = 0.54 nM). On the basis of structure 4, a new series of mu-opioid receptor antagonists were designed. In these compounds the octahydroquinolizine template of 4 was replaced by an octahydro-1H-pyrido[1,2-a]pyrazine scaffold. The new derivatives were tested for their binding affinities and in vitro functional activity against the cloned human mu-, delta-, and kappa-opioid receptors. From this study, we identified compound 36, which displays high affinity toward the mu-opioid receptor (K(i) = 0.47 nM), potent mu in vitro antagonist activity (IC(50) = 1.8 nM) and improved binding selectivity profile mu/kappa and mu/delta, when compared to 4.
Assuntos
Pirazinas/síntese química , Piridinas/síntese química , Receptores Opioides mu/antagonistas & inibidores , Animais , Células CHO , Cricetinae , Cricetulus , Cristalografia por Raios X , Guanosina 5'-O-(3-Tiotrifosfato)/metabolismo , Humanos , Ligantes , Estrutura Molecular , Pirazinas/química , Pirazinas/farmacologia , Piridinas/química , Piridinas/farmacologia , Ensaio Radioligante , Receptores Opioides delta/antagonistas & inibidores , Receptores Opioides kappa/antagonistas & inibidores , Relação Estrutura-AtividadeRESUMO
Selective, nonpeptidic delta opioid receptor agonists have been the subject of great interest as potential novel analgesic agents. The discoveries of BW373U86 (1) and SNC80 (2) contributed to the rapid expansion of research in this field. However, poor drug-like properties and low therapeutic indices have prevented clinical evaluation of these agents. Doses of 1 and 2 similar to those required for analgesic activity produce convulsions in rodents and nonhuman primates. Recently, we described a novel series of potent, selective, and orally bioavailable delta opioid receptor agonists. The lead derivative, ADL5859 (4), is currently in phase II proof-of-concept studies for the management of pain. Further structure activity relationship exploration has led to the discovery of ADL5747 (36), which is approximately 50-fold more potent than 4 in an animal model of inflammatory pain. On the basis of its favorable efficacy, safety, and pharmacokinetic profile, 36 was selected as a clinical candidate for the treatment of pain.
Assuntos
Analgésicos/farmacologia , Analgésicos/uso terapêutico , Benzamidas/farmacologia , Benzamidas/uso terapêutico , Benzopiranos/farmacologia , Benzopiranos/uso terapêutico , Dor/tratamento farmacológico , Receptores Opioides delta/agonistas , Compostos de Espiro/farmacologia , Compostos de Espiro/uso terapêutico , Analgésicos/administração & dosagem , Analgésicos/química , Animais , Benzamidas/administração & dosagem , Benzamidas/química , Benzopiranos/administração & dosagem , Benzopiranos/química , Células CHO , Ensaios Clínicos como Assunto , Cricetinae , Cricetulus , Cristalografia por Raios X , Inibidores do Citocromo P-450 CYP2D6 , Cães , Relação Dose-Resposta a Droga , Descoberta de Drogas , Canais de Potássio Éter-A-Go-Go/antagonistas & inibidores , Humanos , Hiperalgesia/tratamento farmacológico , Masculino , Ratos , Ratos Sprague-Dawley , Compostos de Espiro/administração & dosagem , Compostos de Espiro/químicaRESUMO
Selective delta opioid receptor agonists are promising potential therapeutic agents for the treatment of various types of pain conditions. A spirocyclic derivative was identified as a promising hit through screening. Subsequent lead optimization identified compound 20 (ADL5859) as a potent, selective, and orally bioavailable delta agonist. Compound 20 was selected as a clinical candidate for the treatment of pain.
Assuntos
Analgésicos/administração & dosagem , Benzamidas/administração & dosagem , Benzopiranos/administração & dosagem , Dor/tratamento farmacológico , Receptores Opioides delta/agonistas , Administração Oral , Analgésicos/síntese química , Analgésicos/química , Animais , Benzamidas/síntese química , Benzamidas/química , Benzopiranos/síntese química , Benzopiranos/química , Disponibilidade Biológica , Cães , Relação Dose-Resposta a Droga , Avaliação Pré-Clínica de Medicamentos , Efeitos Colaterais e Reações Adversas Relacionados a Medicamentos , Canais de Potássio Éter-A-Go-Go/efeitos dos fármacos , Humanos , Dose Máxima Tolerável , Camundongos , Estrutura Molecular , Atividade Motora/efeitos dos fármacos , Medição da Dor/efeitos dos fármacos , Ratos , Testes de ToxicidadeRESUMO
A series of opioid peptide ligands containing modified N-terminal tyrosine (Tyr) residues was prepared and evaluated against cloned human mu, delta, and kappa opioid receptors. This work extends the recent discovery that (S)-4-carboxamidophenylalanine (Cpa) is an effective tyrosine bioisostere. Amino acids containing negatively charged functional groups in place of tyrosine's phenolic hydroxyl lacked receptor affinity, while exchange of Tyr for (S)-4-aminophenylalanine was modestly successful. Peptides containing the new amino acids, (S)-4-carboxamido-2,6-dimethylphenylalanine (Cdp) and (S)-beta-(2-aminobenzo[d]thiazol-6-yl)alanine (Aba), displayed binding (K(i)) and functional (EC(50)) profiles comparable to the parent ligands at the three receptors. Cdp represents the best performing Tyr surrogate in terms of overall activity, while Cpa and Aba show a subtle proclivity toward the delta receptor.
Assuntos
Química Farmacêutica/métodos , Peptídeos/química , Receptores Opioides/química , Tirosina/química , Clonagem Molecular , Desenho de Fármacos , Humanos , Ligação de Hidrogênio , Cinética , Ligantes , Modelos Químicos , Conformação Molecular , Receptores Opioides delta/química , Receptores Opioides kappa/química , Receptores Opioides mu/químicaRESUMO
A novel series of malonamide derivatives was synthesized. These amides were shown to be potent and selective kappa opioid receptor agonists.
Assuntos
Química Farmacêutica/métodos , Malonatos/síntese química , Malonatos/farmacologia , Receptores Opioides kappa/antagonistas & inibidores , Citocromo P-450 CYP2D6/química , Desenho de Fármacos , Avaliação Pré-Clínica de Medicamentos , Humanos , Concentração Inibidora 50 , Cinética , Malonatos/química , Modelos Químicos , Conformação MolecularRESUMO
Structure-activity relationships at the 2alpha-position of the piperidine ring of the trans-4,5-dimethyl-4-(3-hydroxyphenyl)piperidine mu-opioid antagonist series were investigated. This study showed that only small linear alkyl groups (methyl, propyl) are tolerated at the 2alpha-position of the piperidine ring of this series.
Assuntos
Piperidinas/síntese química , Piperidinas/farmacologia , Receptores Opioides mu/antagonistas & inibidores , Cristalografia por Raios X , Modelos Moleculares , Conformação Molecular , Piperidinas/química , Estereoisomerismo , Relação Estrutura-AtividadeRESUMO
A novel series of phenylamino acetamide derivatives was synthesized. These amides were shown to be potent and selective kappa opioid receptor agonists.
Assuntos
Acetamidas/química , Analgésicos Opioides/química , Compostos de Anilina/química , Receptores Opioides kappa/agonistas , Analgésicos Opioides/farmacologia , Animais , Humanos , Relação Estrutura-AtividadeRESUMO
Some kappa opioid receptor agonists of the arylacetamide class, for example, ICI 199441 (1), were found to strongly inhibit the activity of cytochrome P450 2D6 (CYP2D6) (1: CYP2D6 IC50=26 nM). Certain analogs bearing a substituted sulfonylamino group, for example, 13, were discovered to have significantly reduced CYP2D6 inhibitory activity (13: CYP2D6 IC50>10 microM) while displaying high affinity toward the cloned human kappa opioid receptor, good kappa/delta and kappa/mu selectivity, and potent in vitro and in vivo agonist activity.
Assuntos
Acetamidas/farmacologia , Inibidores do Citocromo P-450 CYP2D6 , Inibidores Enzimáticos/farmacologia , Receptores Opioides kappa/agonistas , Especificidade por SubstratoRESUMO
Two novel chemical classes of kappa opioid receptor agonists, chroman-2-carboxamide derivatives and 2,3-dihydrobenzofuran-2-carboxamide derivatives, were synthesized. These agents exhibited high and selective affinity for the kappa opioid receptor.
Assuntos
Amidas/farmacologia , Analgésicos Opioides/química , Analgésicos Opioides/farmacologia , Cromanos/farmacologia , Receptores Opioides kappa/agonistas , Amidas/síntese química , Amidas/química , Animais , Benzofuranos/química , Cromanos/síntese química , Cromanos/química , HumanosRESUMO
trans-3,4-Dimethyl-4-(3-carboxamidophenyl)piperidines constitute a novel class of micro opioid receptor antagonists. The CONH(2) group was found to be an effective isostere of the phenolic OH moiety. Structure-activity relationships at the piperidine nitrogen position led to the identification of several ligands displaying high affinity toward the cloned human micro opioid receptors, good selectivity micro/delta, micro/kappa, and potent in vitro antagonist activity.
Assuntos
Piperidinas/síntese química , Piperidinas/farmacologia , Receptores Opioides mu/antagonistas & inibidores , Ligação Competitiva , Clonagem Molecular , Diprenorfina/metabolismo , Humanos , Cinética , Modelos Moleculares , Conformação Molecular , Piperidinas/química , Proteínas Recombinantes/antagonistas & inibidores , Relação Estrutura-AtividadeRESUMO
(S)-4-(Carboxamido)phenylalanine (Cpa) is examined as a bioisosteric replacement for the terminal tyrosine (Tyr) residue in a variety of known peptide ligands for the mu, delta and kappa opioid receptors. The Cpa-containing peptides, assayed against cloned human opioid receptors, display comparable binding affinity (Ki), and agonist potency (EC50) to the parent ligands at the three receptors. Cpa analogs of delta selective peptides show an increase in delta selectivity relative to the mu receptor. Cpa is the first example of an amino acid that acts as a surrogate for Tyr in opioid peptide ligands, challenging the long-standing belief that a phenolic residue is required for high affinity binding.
Assuntos
Analgésicos Opioides/síntese química , Fenilalanina/análogos & derivados , Fenilalanina/síntese química , Receptores Opioides delta/metabolismo , Receptores Opioides kappa/metabolismo , Receptores Opioides mu/metabolismo , Tirosina/farmacologia , Aminoácidos Aromáticos/síntese química , Aminoácidos Aromáticos/farmacologia , Analgésicos Opioides/farmacologia , Sítios de Ligação , Linhagem Celular , Humanos , Ligantes , Estrutura Molecular , Peptídeos Opioides/metabolismo , Fenol/química , Fenilalanina/farmacologia , Receptores Opioides delta/efeitos dos fármacos , Receptores Opioides kappa/efeitos dos fármacos , Receptores Opioides mu/efeitos dos fármacosRESUMO
A new class of kappa-opioid receptor agonists is described. The design of these agents was based upon energy minimization and structural overlay studies of the generic azepin-2-one structure 3 with the crystal structure of arylacetamide kappa agonist 1, ICI 199441. The most active compound identified was ligand 4a (K(i)=0.34 nM), which demonstrated potent antinociceptive activity after oral administration in rodents.