RESUMO
Our continued effort towards optimization of the pyrazolo[1,5-a]pyrimidine scaffold as B-Raf kinase inhibitors is described. Structure guided design was utilized to introduce kinase hinge region interacting groups in the 2-position of the scaffold. This strategy led to the identification of lead compound 9 with enhanced enzyme and cellular potency, while maintaining good selectivity over a number of kinases.
Assuntos
Antineoplásicos/química , Inibidores Enzimáticos/química , Proteínas Proto-Oncogênicas B-raf/antagonistas & inibidores , Pirazóis/química , Pirimidinas/química , Antineoplásicos/farmacologia , Desenho de Fármacos , Inibidores Enzimáticos/farmacologia , Humanos , Pirazóis/farmacologia , Pirimidinas/farmacologiaRESUMO
As part of our research effort to discover B-Raf kinase inhibitors, we prepared a series of C-3 substituted N-(3-(pyrazolo[1,5-a]pyrimidin-7-yl)phenyl)-3-(trifluoromethyl)benzamides. X-ray crystallography studies revealed that one of the more potent inhibitors (10n) bound to B-Raf kinase without forming a hinge-binding hydrogen bond. With basic amine residues appended to C-3 aryl residues, cellular activity and solubility were enhanced over previously described compounds of this class.
Assuntos
Benzamidas/farmacologia , Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/farmacologia , Proteínas Proto-Oncogênicas B-raf/antagonistas & inibidores , Pirazóis/farmacologia , Pirimidinas/farmacologia , Benzamidas/síntese química , Benzamidas/química , Cristalografia por Raios X , Modelos Moleculares , Estrutura Molecular , Inibidores de Proteínas Quinases/síntese química , Proteínas Proto-Oncogênicas B-raf/metabolismo , Pirazóis/síntese química , Pirazóis/química , Pirimidinas/síntese química , Pirimidinas/química , Estereoisomerismo , Relação Estrutura-AtividadeRESUMO
B-Raf kinase plays a critical role in the Raf-MEK-ERK signaling pathway and inhibitors of B-Raf could be used in the treatment of melanomas, colorectal cancer, and other Ras related human cancers. We have identified novel small molecule pyrazolo[1,5-a]pyrimidine derivatives as B-Raf kinase inhibitors. Structure-activity relationship was generated for various regions of the scaffold to improve the biochemical profile.
Assuntos
Inibidores de Proteínas Quinases/síntese química , Proteínas Proto-Oncogênicas B-raf/antagonistas & inibidores , Pirimidinas/síntese química , Linhagem Celular Tumoral , Simulação por Computador , Humanos , Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/farmacologia , Proteínas Proto-Oncogênicas B-raf/metabolismo , Pirimidinas/química , Pirimidinas/farmacologia , Relação Estrutura-AtividadeRESUMO
The synthesis and structure-activity studies of a series of 6-substituted-4-anilino-[1,7]-naphthyridine-3-carbonitriles as inhibitors of Tpl2 kinase are described. The early exploratory work described here may lead to the discovery of compounds with significant therapeutic potential for treating rheumatoid arthritis and other inflammatory diseases.