Novel tricyclic pyrazole BRAF inhibitors with imidazole or furan central scaffolds
作者:Dan Niculescu-Duvaz、Ion Niculescu-Duvaz、Bart M.J.M. Suijkerbuijk、Delphine Ménard、Alfonso Zambon、Arnaud Nourry、Lawrence Davies、Helen A. Manne、Frank Friedlos、Lesley Ogilvie、Douglas Hedley、Andrew K. Takle、David M. Wilson、Jean-Francois Pons、Tom Coulter、Ruth Kirk、Neus Cantarino、Steven Whittaker、Richard Marais、Caroline J. Springer
DOI:10.1016/j.bmc.2010.06.031
日期:2010.9
V-RAF murine sarcoma viral oncogene homolog B1 (BRAF) is a serine/threonine-specific protein kinase that is mutated with high frequency in cutaneous melanoma, and many other cancers. Inhibition of mutant BRAF is an attractive therapeutic approach for the treatment of melanoma. A triarylimidazole BRAF inhibitor bearing a phenylpyrazole group (dimethyl-[2-(4-5-[4-(1H-pyrazol-3-yl)-phenyl]-4-pyridin- 4-yl-1H-imidazol-2-yl}-phenoxy)-ethyl]-amine, 1a) was identified as an active BRAF inhibitor. Based on this starting point, we synthesized a series of analogues leading to the discovery of 6-2-[4-(4-methylpiperazin- 1-yl)-phenyl]-5-pyridin-4-yl-3H-imidazol-4-yl}-2,4-dihydro-indeno[1,2-c]pyrazole (1j), with nanomolar activity in three assays: inhibition of purified mutant BRAF activity in vitro; inhibition of oncogenic BRAF-driven extracellular regulated kinase (ERK) activation in BRAF mutant melanoma cell lines; and inhibition of proliferation in these cells. (C) 2010 Elsevier Ltd. All rights reserved.