RESUMO
Piperazinebenzylamine derivatives from trans-4-(4-chlorophenyl)tetrahydrothiophene-3-carboxylic acid 6 and its S-oxide 7 and sulfone 8, and the tetrahydrofuran 9 and its two regioisomers 11 and 13 were synthesized and studied for their binding affinities at the human melanocortin-4 receptor. These five-membered ring constrained compounds possessed similar or lower potency compared to the acyclic analogs.
Assuntos
Furanos/síntese química , Furanos/farmacologia , Piperazinas/síntese química , Piperazinas/farmacologia , Receptor Tipo 4 de Melanocortina/efeitos dos fármacos , Tiofenos/síntese química , Tiofenos/farmacologia , Técnicas de Química Combinatória , Furanos/química , Humanos , Ligantes , Estrutura Molecular , Piperazinas/química , Tiofenos/químicaRESUMO
Based on 3-phenylpropionamides, a series of 3-arylpyrrolidine-2-carboxamide derivatives was designed and synthesized to study the effect of cyclizations as melanocortin-4 receptor ligands. It was found that the 2R,3R-pyrrolidine isomer possessed the most potent affinity among the four stereoisomers.
Assuntos
Desenho de Fármacos , Pirrolidinas/síntese química , Receptor Tipo 4 de Melanocortina/agonistas , Administração Oral , Animais , Disponibilidade Biológica , Encéfalo/efeitos dos fármacos , Ciclização , Estrutura Molecular , Pirrolidinas/química , Pirrolidinas/farmacocinética , Pirrolidinas/farmacologia , Ratos , Receptor Tipo 4 de Melanocortina/metabolismo , Estereoisomerismo , Relação Estrutura-AtividadeRESUMO
A series of trans-4-phenylpyrrolidine-3-carboxamides were synthesized and characterized as potent ligands of the human melanocortin-4 receptor. Interestingly, a pair of diastereoisomers 13b displayed potent functional agonist and antagonist activity, respectively. Thus, the 3S,4R-pyrrolidine 13b-1 possessed a Ki of 1.0 nM and an EC50 of 3.8 nM, while its 3R,4S-isomer 13b-2 exhibited a Ki of 4.7 and an IC50 of 64 nM. Both compounds were highly selective over other melanocortin receptor subtypes. The MC4R agonist 13b-1 also demonstrated efficacy in a diet-induced obesity model in rats.
Assuntos
Pirrolidinas/química , Pirrolidinas/farmacologia , Receptor Tipo 4 de Melanocortina/agonistas , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , Amidas/síntese química , Amidas/química , Amidas/farmacologia , Animais , Relação Dose-Resposta a Droga , Ingestão de Alimentos/efeitos dos fármacos , Humanos , Cinética , Masculino , Pirrolidinas/síntese química , Pirrolidinas/farmacocinética , Ratos , Estereoisomerismo , Relação Estrutura-AtividadeRESUMO
A series of 2-piperazine-alpha-isopropylbenzylamine derivatives were synthesized and characterized as melanocortin-4 receptor (MC4R) antagonists. Attaching an amino acid to benzylamines 7 significantly increased their binding affinity, and the resulting compounds 8-12 bound selectively to MC4R over other melanocortin receptor subtypes and behaved as functional antagonists. These compounds were also studied for their permeability using Caco-2 cell monolayers and metabolic stability in human liver microsomes. Most compounds exhibited low permeability and high efflux ratio possibly due to their high molecular weights. They also showed moderate metabolic stability which might be associated with their moderate to high lipophilicity. Pharmacokinetic properties of these MC4R antagonists, including brain penetration, were studied in mice after oral and intravenous administrations. Two compounds identified to possess high binding affinity and selectivity, 10d and 11d, were studied in a murine cachexia model. After intraperitoneal (ip) administration of 1mg/kg dose, mice treated with 10d had significantly more food intake and weight gain than the control animals, demonstrating efficacy by blocking the MC4 receptor. Similar in vivo effects were also observed when 11d was dosed orally at 20mg/kg. These results provide further evidence that a potent and selective MC4R antagonist has potential in the treatment of cancer cachexia.
Assuntos
Benzilaminas/farmacologia , Caquexia/tratamento farmacológico , Piperazinas/farmacologia , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , Animais , Benzilaminas/síntese química , Benzilaminas/química , Células CACO-2 , Carcinoma Pulmonar de Lewis , Cristalografia por Raios X , Modelos Animais de Doenças , Cães , Relação Dose-Resposta a Droga , Haplorrinos , Humanos , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Modelos Moleculares , Conformação Molecular , Piperazinas/síntese química , Piperazinas/química , Ratos , Estereoisomerismo , Relação Estrutura-Atividade , Fatores de Tempo , Distribuição Tecidual , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Benzylamine and pyridinemethylamine derivatives were synthesized and characterized as potent and selective antagonists of the melanocortin-4 receptor (MC4R). These compounds were also profiled in rodents for their pharmacokinetic properties. Two compounds with diversified profiles in chemical structure, pharmacological activities, and pharmacokinetics, 10 and 12b, showed efficacy in an established murine cachexia model. For example, 12b had a K(i) value of 3.4 nM at MC4R, was more than 200-fold selective over MC3R, and had a good pharmacokinetic profile in mice, including high brain penetration. Moreover, 12b was able to stimulate food intake in the tumor-bearing mice and reverse their lean body mass loss. Our results provided further evidence that a potent and selective MC4R antagonist with appropriate pharmacokinetic properties might potentially be useful for the treatment of cancer cachexia.
Assuntos
Amidas/síntese química , Benzilaminas/síntese química , Piperazinas/síntese química , Piridinas/síntese química , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , Amidas/farmacocinética , Amidas/farmacologia , Animais , Benzilaminas/farmacocinética , Benzilaminas/farmacologia , Caquexia/tratamento farmacológico , Caquexia/etiologia , Carcinoma Pulmonar de Lewis/complicações , Linhagem Celular , Cristalografia por Raios X , AMP Cíclico/metabolismo , Desenho de Fármacos , Ingestão de Alimentos/efeitos dos fármacos , Humanos , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Modelos Moleculares , Transplante de Neoplasias , Piperazinas/farmacocinética , Piperazinas/farmacologia , Piridinas/farmacocinética , Piridinas/farmacologia , Estereoisomerismo , Relação Estrutura-AtividadeRESUMO
A potent and selective antagonist of the melanocortin-4 receptor, 1-[2-[(1S)-(3-dimethylaminopropionyl)amino-2-methylpropyl]-6-methylphenyl]-4-[(2R)-methyl-3-(4-chlorophenyl)propionyl]piperazine (10d), was identified from a series piperazinebenzylamine attached with a N,N-dimethyl-beta-alanine side chain. This compound possessed high water solubility and exhibited good metabolic profiles. In animals, 10d showed moderate to good oral bioavailability and promoted food intake in tumor-bearing mice after oral administration.
Assuntos
Caquexia/tratamento farmacológico , Piperazinas/síntese química , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , beta-Alanina/análogos & derivados , Administração Oral , Animais , Disponibilidade Biológica , Caquexia/etiologia , AMP Cíclico/metabolismo , Cães , Ingestão de Alimentos/efeitos dos fármacos , Humanos , Macaca mulatta , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Microssomos Hepáticos/metabolismo , Transplante de Neoplasias , Neoplasias Experimentais/complicações , Piperazinas/farmacocinética , Piperazinas/farmacologia , Ensaio Radioligante , Ratos , Ratos Sprague-Dawley , Solubilidade , Estereoisomerismo , Relação Estrutura-Atividade , beta-Alanina/síntese química , beta-Alanina/farmacocinética , beta-Alanina/farmacologiaRESUMO
A series of trans-N-alkyl-4-(4-chlorophenyl)pyrrolidine-3-carboxamides of piperazinecyclohexanemethylamines was synthesized and characterized for binding and function at the melanocortin-4 receptor (MC4R), and several potent benzylamine derivatives were identified. Compound 18 v was found to bind MC4R with potent affinity (K(i)=0.5 nM) and high selectivity over the other melanocortin subtypes and behaved as a functional antagonist (IC(50)=48 nM).
Assuntos
Amidas/química , Ácidos Carboxílicos/química , Compostos Clorados/síntese química , Cicloexanos/química , Piperazinas/química , Pirrolidinas/química , Receptor Tipo 4 de Melanocortina/metabolismo , Compostos Clorados/química , Cicloexanos/farmacologia , Ligantes , Estrutura Molecular , Piperazina , Receptor Tipo 4 de Melanocortina/agonistas , Relação Estrutura-AtividadeRESUMO
A series of trans-4-phenylpyrrolidine-3-carboxamides were synthesized and characterized as potent ligands of the human melanocortin-4 receptor. Interestingly, a pair of diastereoisomers 20f-1 and 20f-2 displayed potent functional agonist and antagonist activity, respectively. Thus, the 3S,4R-compound 20f-1 possessed a K(i) of 11nM and an EC(50) of 24nM, while its 3R,4S-isomer 20f-2 exhibited a K(i) of 8.6 and an IC(50) of 65nM. Both compounds were highly selective over other melanocortin receptor subtypes. The MC4R agonist 20f-1 also demonstrated efficacy in diet-induced obese rats.
Assuntos
Pirrolidinas/síntese química , Receptor Tipo 4 de Melanocortina/agonistas , Animais , Disponibilidade Biológica , Humanos , Injeções Intravenosas , Ligação Proteica/fisiologia , Pirrolidinas/administração & dosagem , Pirrolidinas/metabolismo , Ratos , Ratos Zucker , Receptor Tipo 4 de Melanocortina/metabolismoRESUMO
A series of pyrrolidine derivatives were synthesized and characterized as potent agonists of the human melanocortin-4 receptor. For example, 28c had a K(i) of 13 nM in binding affinity and EC(50) of 6.9 nM in agonist potency with an intrinsic activity of 100% of the endogenous ligand alpha-MSH.
Assuntos
Pirrolidinas/farmacologia , Receptor Tipo 4 de Melanocortina/agonistas , Linhagem Celular , HumanosRESUMO
A series of pyrrolidinones derived from phenylalaninepiperazines were synthesized and characterized as potent and selective antagonists of the melanocortin-4 receptor. In addition to their high binding affinities, these compounds displayed high functional potencies. 12a had a K(i) of 0.94 nM in binding and IC(50) of 21 nM in functional activity. 12a also demonstrated efficacy in a mouse cachexia model.
Assuntos
Pirrolidinonas/química , Pirrolidinonas/farmacologia , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , Receptor Tipo 4 de Melanocortina/metabolismo , Alquilação , Aminas/química , Animais , Encéfalo/efeitos dos fármacos , Humanos , Ligantes , Camundongos , Camundongos Endogâmicos C57BL , Estrutura Molecular , Pirrolidinonas/síntese química , Pirrolidinonas/farmacocinética , Relação Estrutura-AtividadeRESUMO
A series of pyrrolidinones derived from phenylalanines were synthesized as potent antagonists of the human melanocortin-4 receptor. These compounds showed high potencies and selectivities, and several of them had good oral bioavailabilities. In addition, 12e demonstrated in vivo efficacy in a murine cachexia model.
Assuntos
Caquexia/tratamento farmacológico , Pirrolidinonas/química , Pirrolidinonas/farmacologia , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , Administração Oral , Animais , Disponibilidade Biológica , Composição Corporal , Peso Corporal , Modelos Animais de Doenças , Humanos , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Estrutura Molecular , Pirrolidinonas/administração & dosagem , Pirrolidinonas/uso terapêutico , Relação Estrutura-AtividadeRESUMO
A series of 3-arylpropionylpiperazines were synthesized as antagonists of the melanocortin-4 receptor. Their potency was found to be increased by replacing the alpha-methyl substituent of the initial lead 11 with a larger s-Bu or i-Bu group. Further potency enhancement was observed when a glycine or beta-alanine was incorporated onto the benzylamine. Some compounds demonstrated good potency, moderate selectivity, and oral bioavailability.
Assuntos
Piperazinas/química , Piperazinas/farmacologia , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , Animais , Benzilaminas/química , Humanos , Camundongos , Estrutura Molecular , Piperazina , Piperazinas/síntese química , Piperazinas/farmacocinética , Receptor Tipo 4 de Melanocortina/metabolismo , Relação Estrutura-AtividadeRESUMO
A series of alpha-benzylpropionylpiperazines were synthesized and tested as antagonists of the melanocortin-4 receptor. In addition to its high potency and selectivity, R-11a had desirable pharmacokinetic properties including high brain penetration in mice.
Assuntos
Piperazinas/química , Piperazinas/farmacologia , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , Receptor Tipo 4 de Melanocortina/metabolismo , Amidas/química , Animais , Humanos , Ligantes , Camundongos , Estrutura Molecular , Piperazina , Piperazinas/síntese química , Piperazinas/farmacocinética , Relação Estrutura-AtividadeRESUMO
A series of 2-pyridinylpiperazines derived from beta-Ala-(2,4-Cl)Phe dipeptide was synthesized for the study of their SARs and possible interactions with the MC4 receptor. Compounds such as 11k (Ki=6.5 nM) possessed high potency.
Assuntos
Piperazinas/síntese química , Piperazinas/farmacologia , Piridinas/síntese química , Piridinas/farmacologia , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , Dipeptídeos/química , Desenho de Fármacos , Humanos , Relação Estrutura-Atividade , beta-Alanina/químicaRESUMO
A series of cyclohexylpiperazines was synthesized as potent and selective antagonists of the human MC4 receptor. Compound 14t displayed binding affinity (Ki) of 4.2 and 1100 nM at MC4R and MC3R, respectively.
Assuntos
Amidas/química , Piperidinas/farmacologia , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , Ligação Competitiva , Humanos , Conformação Molecular , Piperidinas/síntese química , Piperidinas/química , Receptor Tipo 3 de Melanocortina/antagonistas & inibidores , Relação Estrutura-AtividadeRESUMO
[reaction: see text] 2-[4-(tert-Butoxycarbonyl)piperazinyl]benzylidene-tert-butanesulfinamides underwent nucleophilic 1,2-addition with different organometallic reagents to give highly diastereomerically enriched adducts. X-ray crystallography of the resulting alpha-branched N-Boc-2-piperazinylbenzyl-tert-butanesulfinamides confirms different mechanisms depending on the organometallic reagent used. Differential deprotection of the N-Boc and the tert-butanesulfinamides was investigated, and the dehydration byproducts have been identified and characterized. To avoid the formation of byproducts in the acidic deprotection step, the N-tert-butanesulfinamide group was converted to the corresponding N-tert-butanesulfonamide (Bus), which allowed for clean orthogonal deprotection. The efficient synthesis and deprotection of the N-Boc-2-piperazinylbenzyl-tert-butanesulfinamides herein described constitutes an attractive method for extensive structure-activity studies in the search for novel ligands of the human melanocortin 4 receptor.
Assuntos
Benzilaminas/química , Butanos/química , Iminas/química , Enxofre/química , Aldeídos/química , Alquilação , Carbono/química , Catálise , Cristalografia por Raios X , Iminas/síntese química , Lítio/química , Estrutura Molecular , Nitrogênio/química , EstereoisomerismoRESUMO
The melanocortin-4 receptor (MC4R) plays an important role in the regulation of energy homeostasis. Recent studies have shown that blockade of the MC4R reverses tumor-induced weight loss in mice. Herein, we describe the synthesis and identification of potent and selective non-peptide antagonists of the human MC4R from a series of 2-ethoxycarbonylcyclohexyl-piperazines. Compound 12i was found to possess low nanomolar affinity for the MC4R, and exhibit oral bioavailability in rats. More importantly, when administered orally to mice (10 mg/kg), it led to statistically significant increases in food intake over a 24-h period.
Assuntos
Piperazinas/síntese química , Receptor Tipo 4 de Melanocortina/antagonistas & inibidores , Administração Oral , Animais , Disponibilidade Biológica , Caquexia/tratamento farmacológico , Ingestão de Alimentos/efeitos dos fármacos , Humanos , Piperazinas/farmacocinética , Piperazinas/farmacologia , Ligação Proteica , Ratos , Relação Estrutura-AtividadeRESUMO
SAR studies on a series of piperazinebenzenes directed toward the human melanocortin-4 receptor resulted in potent MC4R agonists. Replacement of the triazole moiety of an initial lead 4 by a basic nitrogen baring a lipophilic side-chain increased the binding affinities of these compounds. Analogs bearing an additional hetero-atom in the side-chain possessed good agonist potency. Thus, 11h had a Ki of 11 nM, and 13g exhibited an EC50 of 3.8 nM and a Ki of 6.4 nM.