Novel morpholin-3-one fused quinazoline derivatives as EGFR tyrosine kinase inhibitors.

A series of novel morpholin-3-one-fused quinazoline derivatives were designed, synthesized and evaluated as EGFR tyrosine kinase inhibitors. Nineteen compounds showed significant inhibitory activities against EGFR(wt) kinase (IC50<1 μM). Compound a8 demonstrated the most potent inhibitory activity toward EGFR(wt) (IC50=53.1 nM). Compound a7 and a8 showed excellent inhibitory activities against mutant EGFR(T790M/L858R) and strong antiproliferative activity against H358 and A549 cell lines. Finally, molecular docking studies were performed to predict the possible binding mode of the target compounds. It is believed that this work would be very useful for designing a new series of tyrosine kinase inhibitors targeting EGFR.