2-Oxo-3, 4-dihydropyrimido[4, 5- d ]pyrimidinyl derivatives as new irreversible pan fibroblast growth factor receptor (FGFR) inhibitors

A series of 2-oxo-3, 4-dihydropyrimido[4,5-d]-pyrimidinyl derivatives were designed and synthesized as new irreversible inhibitors of the FGFR family. One of the most promising compounds 2l potently inhibited FGFR1/2/3 with IC50 values of 1.06, 0.84 and 5.38 nM, respectively, whereas its potency against FGFR4 was diminished by an order of magnitude. Compound 2l strongly suppresses the proliferation of FGFR1-amplified H520 non-small cell lung cancer cells, FGFR2-amplified SUM52 breast cancer cells and FGFR3-amplified SW780 bladder cancer cells with low nanomolar IC50 values, but was significantly less potent against four FGFR-negative cancer cell lines, with low micromolar IC50 values. Biological investigation also confirmed the irreversible binding of the molecule with the FGFR1-3 target kinases. Compound 2l may serve as a promising new lead for further anticancer drug discovery.