Discovery of novel 2-aminopyridine-3-carboxamides as c-Met kinase inhibitors

A series of 2-aminopyridine-3-carboxamide derivatives against c-Met were designed and synthesized by employing bioisosteric replacement of heterocyclic moieties with the amide bond. The SAR exploration led to the identification of a potent compound (S)-24o with a c-Met IC50 of 0.022μM. This compound exhibited dose-dependent inhibition of the phosphorylation of c-Met as well as c-Met downstream signaling in EBC-1 cells. The interactive binding model of (S)-24o was elucidated using AutoDock4.2. A series of 2-aminopyridine-3-carboxamide derivatives against c-Met were designed and synthesized by employing bioisosteric replacement of heterocyclic moieties with the amide bond. The structure–activity relationship (SAR) at various positions of the scaffold was explored. In this study, a promising compound (S)-24o with a c-Met IC50 of 0.022μM was identified. The compound exhibited dose-dependent inhibition of the phosphorylation of c-Met as well as downstream signaling in EBC-1 cells. Furthermore, the interactive binding model of (S)-24o with c-Met was elucidated by virtue of a molecular modeling study.