In present study, we described the synthesis and biological evaluation of a new class of EGFR inhibitors containing 2,9-disubstituted 8-phenylthio/phenylsulfinyl-9H-purine scaffold. Thirty-one compounds were synthesized. Among them, compound C9 displayed the IC₅₀ of 29.4 nM against HCC827 cell line and 1.9 nM against EGFR^L858R. Compound C12 showed moderate inhibitory activity against EGFR^{L858R/T790M/C797S} (IC₅₀ = 114 nM). Western bolt assay suggested that compound C9 significantly inhibited EGFR phosphorylation. In vivo test, compound C9 remarkably exhibited inhibitory effect on tumor growth at 5.0 mg/kg by oral administration in established nude mouse HCC827 xenograft model. These results indicate that the 2,9-disubstituted 8-phenylsulfinyl/phenylsulfinyl-9H-purine derivatives can act as potent EGFR(L858R) inhibitors and effective anticancer agents. Additionally, optimization of compound C12 may result in discovering the fourth-generation EGFR-TKIs.

在本研究中，我们描述了包含2，9-二取代的8-苯硫基/苯亚磺酰基-9 H-嘌呤支架的新型EGFR抑制剂的合成和生物学评估。合成了三十一种化合物。其中，化合物C9对HCC827细胞系的IC ₅₀为29.4 nM，对EGFR ^L858R的IC ₅₀为1.9 nM 。化合物C12显示出对EGFR ^{L858R / T790M / C797S的}中等抑制活性（IC ₅₀  = 114 nM）。Western螺栓测定表明化合物C9显着抑制EGFR磷酸化。体内测试，化合物C9在已建立的裸鼠HCC827异种移植模型中，口服给药对5.0 mg / kg的肿瘤生长具有明显的抑制作用。这些结果表明，2，9-二取代的8-苯基亚磺酰基/苯基亚磺酰基-9 H-嘌呤衍生物可以作为有效的EGFR（L858R）抑制剂和有效的抗癌剂。另外，化合物C12的优化可能会导致发现第四代EGFR-TKI。