3 years ago

Discovery of (R)-5-(benzo[d][1,3]dioxol-5-yl)-7-((1-(vinylsulfonyl)pyrrolidin-2-yl)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine (B6) as a potent Bmx inhibitor for the treatment of NSCLC

Discovery of (R)-5-(benzo[d][1,3]dioxol-5-yl)-7-((1-(vinylsulfonyl)pyrrolidin-2-yl)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine (B6) as a potent Bmx inhibitor for the treatment of NSCLC
Described as a Btk inhibitor, ibrutinib also potently inhibits Bmx and EGFR, two good targets for lung cancer. Owing to its high CLogP (4.07) and low aqueous solubility (<0.01mg/ml), resulting in unfavorable bioavailability, ibrutinib requires high dosages to achieve good clinical response in the treatment of non-small cell lung cancer (NSCLC). In our effort to improve the CLogP of ibrutinib by structural optimization led to the discovery of a potent anti-cancer agent B6, with beneficial physicochemical parameters (CLogP=2.56, solubility in water0.1mg/ml) meeting the principles of oral drugs. B6 exhibited anti-proliferation activities against EGFR-expressing cells, especially the mutant ones, such as H1975 (L858R/T790M, IC50 =0.92±0.19μM) and HCC827 (Del119 IC50 =0.014±0.01μM). Moreover, B6 significantly slowed down H1975 tumor growth with anti-tumor rate of 73.9% (p <0.01). Enzyme potencies assay demonstrated B6 moderately selectively inhibited Bmx (IC50 =35.7±0.1nM) over other kinases. So, as a potent Bmx inhibitor, B6 has the potential to be an efficacious treatment for NSCLC with acquired drug resistance.

Publisher URL: www.sciencedirect.com/science

DOI: S0960894X17307023

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