RESUMO
The discovery of potent, bioavailable small molecule inhibitors of p53-HDM2 PPI led us to investigate subsequent modifications to address a CYP3A4 time-dependent inhibition liability. On the basis of the crystal structure of HDM2 in complex with 2, further functionalization of the solvent exposed area of the molecule that binds to Phe19 pocket were investigated as a strategy to modulate the molecule liphophilicity. Introduction of 2-oxo-nicotinic amide at Phe19 proved a viable strategy in obtaining inhibitors exempt from CYP3A4 time-dependent inhibition liability.
Assuntos
Citocromo P-450 CYP3A/metabolismo , Fenilalanina/farmacologia , Proteínas Proto-Oncogênicas c-mdm2/antagonistas & inibidores , Bibliotecas de Moléculas Pequenas/farmacologia , Proteína Supressora de Tumor p53/antagonistas & inibidores , Relação Dose-Resposta a Droga , Humanos , Estrutura Molecular , Fenilalanina/química , Ligação Proteica/efeitos dos fármacos , Proteínas Proto-Oncogênicas c-mdm2/metabolismo , Bibliotecas de Moléculas Pequenas/síntese química , Bibliotecas de Moléculas Pequenas/química , Relação Estrutura-Atividade , Proteína Supressora de Tumor p53/metabolismoRESUMO
Identification of purposeful chemical matter on a broad range of drug targets is of high importance to the pharmaceutical industry. However, disease-relevant but more complex hit-finding plans require flexibility regarding the subset of the compounds that we screen. Herein we describe a strategy to design high-quality small molecule screening subsets of two different sizes to cope with a rapidly changing early discovery portfolio. The approach taken balances chemical tractability, chemical diversity and biological target coverage. Furthermore, using surveys, we actively involved chemists within our company in the selection process of the diversity decks to ensure current medicinal chemistry principles were incorporated. The chemist surveys revealed that not all published PAINS substructure alerts are considered productive by the medicinal chemistry community and in agreement with previously published results from other institutions, QED scores tracked quite well with chemists' notions of chemical attractiveness.
Assuntos
Descoberta de Drogas , Bibliotecas de Moléculas Pequenas/química , Algoritmos , Indústria Farmacêutica , Ensaios de Triagem em Larga EscalaRESUMO
Led by the structural information of the screening hit with mDM2 protein, a structure modification of Leu26 moiety of the novel p53-hDM2 inhibitors was conducted. A structure-activity relationship study of 4-substituted piperidines revealed compound 20t with good potencies and excellent CYP450 profiles.
Assuntos
Leucina/química , Piperidinas/farmacologia , Proteínas Proto-Oncogênicas c-mdm2/antagonistas & inibidores , Proteína Supressora de Tumor p53/antagonistas & inibidores , Relação Dose-Resposta a Droga , Humanos , Modelos Moleculares , Estrutura Molecular , Piperidinas/síntese química , Piperidinas/química , Proteínas Proto-Oncogênicas c-mdm2/metabolismo , Relação Estrutura-Atividade , Proteína Supressora de Tumor p53/metabolismoRESUMO
A new subseries of substituted piperidines as p53-HDM2 inhibitors exemplified by 21 has been developed from the initial lead 1. Research focused on optimization of a crucial HDM2 Trp23-ligand interaction led to the identification of 2-(trifluoromethyl)thiophene as the preferred moiety. Further investigation of the Leu26 pocket resulted in potent, novel substituted piperidine inhibitors of the HDM2-p53 interaction that demonstrated tumor regression in several human cancer xenograft models in mice. The structure of HDM2 in complex with inhibitors 3, 10, and 21 is described.
RESUMO
Introduction of an aliphatic side chain to a key position of a novel piperidine-based HDM2 inhibitor scaffold resulted in significant potency gains, enabling further series progression.
RESUMO
The discovery of 3,3-disubstituted piperidine 1 as novel p53-HDM2 inhibitors prompted us to implement subsequent SAR follow up directed towards piperidine core modifications. Conformational restrictions and further functionalization of the piperidine core were investigated as a strategy to gain additional interactions with HDM2. Substitutions at positions 4, 5 and 6 of the piperidine ring were explored. Although some substitutions were tolerated, no significant improvement in potency was observed compared to 1. Incorporation of an allyl side chain at position 2 provided a drastic improvement in binding potency.
Assuntos
Piperidinas/síntese química , Piperidinas/farmacologia , Proteínas Proto-Oncogênicas c-mdm2/antagonistas & inibidores , Proteína Supressora de Tumor p53/antagonistas & inibidores , Bioensaio , Proliferação de Células/efeitos dos fármacos , Humanos , Concentração Inibidora 50 , Estrutura Molecular , Piperidinas/química , Ligação Proteica/efeitos dos fármacos , Proteínas Proto-Oncogênicas c-mdm2/metabolismo , Relação Estrutura-Atividade , Proteína Supressora de Tumor p53/metabolismoRESUMO
Novel small molecule HDM2 inhibitor, substituted piperidine, was identified. Initial SAR study indicated potential for several position optimizations. Additional potency enhancement was achieved by introducing a sidechain off the aromatic ring. DMPK study of one of the active compounds has shown a moderate oral PK and reasonable bioavailability.
Assuntos
Piperidinas/farmacologia , Proteínas Proto-Oncogênicas c-mdm2/antagonistas & inibidores , Relação Dose-Resposta a Droga , Humanos , Estrutura Molecular , Piperidinas/síntese química , Piperidinas/química , Relação Estrutura-AtividadeRESUMO
Substituted benzimidazoles were profiled as inhibitors of kinesin spindle protein (KSP), an increasingly important target for the development of anticancer drugs. This series demonstrated the monoastral phenotypic response and was found to be active in both enzymatic and cellular-based assays.
Assuntos
Benzimidazóis/química , Inibidores Enzimáticos/química , Cinesinas/antagonistas & inibidores , Animais , Benzimidazóis/síntese química , Benzimidazóis/farmacologia , Células CACO-2 , Linhagem Celular , Sistema Enzimático do Citocromo P-450/metabolismo , Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/farmacologia , Humanos , Cinesinas/metabolismo , Ratos , Relação Estrutura-AtividadeRESUMO
The intramolecular inverse-electron-demand Diels-Alder reaction between imidazoles and 1,2,4-triazines linked by a trimethylene tether from the imidazole N1 position to the triazine C3 proceed in excellent yields to produce 1,2,3,4-tetrahydro-1,5-naphthyridines. The reaction proceeds by a cycloaddition with subsequent loss of nitrogen, followed by a presumed stepwise loss of a nitrile. The analogous intramolecular cycloadditions employing a tetramethylene tether also proceeded to give 2,3,4,5-tetrahydro-1H-pyrido[3,2-b]azepines in acceptable yields. The reaction to produce the tetrahydro-1,5-naphthyridines can also be promoted with microwave irradiation.
Assuntos
Elétrons , Compostos Heterocíclicos/síntese química , Imidazóis/síntese química , Naftiridinas/síntese química , Triazinas/química , Ciclização , Imidazóis/química , Estrutura MolecularRESUMO
Intermolecular inverse electron demand cycloadditions of 2-substituted imidazoles with various 1,2,4-triazines produced both imidazo[4,5-c]pyridines (3-deazapurines) and pyrido[3,2-d]pyrimid-4-ones (8-deazapteridines). The product distribution was controlled by reactant substituents and influenced by reaction temperature. A regioselective method for the preparation of 6-unsubstituted 1,2,4-triazines was also developed. By using this route to 8-deazapteridines, a new 8-deazafolate analogue was prepared.