BRAF Inhibitors Based on an Imidazo[4,5]pyridin-2-one Scaffold and a Meta Substituted Middle Ring

摘要

We recently reported on the development of a novel series of BRAF inhibitors based on a tripartite A-B-C system characterized by a para-substituted central aromatic core connected to an imidazo-[4,5]pyridin-2-one scaffold and it substituted urea linker. Here, we present it new series of BRAY inhibitors in which the central phenyl ring connects to the hinge binder and substrate pocket of BRAF with a meta-substitution pattern. The optimization of this new scaffold led to the development of low-nanomolar inhibitors that permits the use of a wider range of linkers and terminal C rings while enhancing the selectivity for the BRAF enzyme in comparison to the para series.