Discovery and chiral synthesis of potent c-Met (HGFR) aminopyridine inhibitors

MEDI 233

Pei-Pei Kung, peipei.kung@pfizer.com, Department of Medicinal Chemistry, Pfizer, PGRD, 10770 Science Center Drive, San Diego, CA 92121
The discovery of potent and selective c-Met (HGFR) 2-aminopyridine-4-phenyl inhibitors is presented. Optimization of the kinase inhibitory potency (Ki=210 nM) and the cell potency of the initial lead (IC50=1 microM) is described. This optimization effort involved synthesizing 30 compounds and led to the discovery of a lead compound with improved potency (Ki=20 nM; IC50=40 nM), metabolic stability (t1/2=260 min) and physical properties (solubility>200 microM) relative to the initial lead. The development of a chiral synthetic route to this improved molecule utilizing biotransformation is also described along with PK/PD and TGI experiments.