Abstract Two series of quinoline derivatives bearing the pyridine/pyrimidine scaffold were synthesized, and evaluated for their c-Met kinase inhibitory activity and antiproliferative activity against 5 cancer cell lines (HT-29, H460, MKN-45, A549, and U87MG) were evaluated in vitro. Most compounds showed moderate to excellent potency, and compared to foretinib, the most promising analog 18b (c-Met half-maximal inhibitory concentration [ ...