Axl and Mer are members of the TAM (Tyro3-Axl-Mer) family of receptor tyrosine kinases. Previously, we reported that enzyme-mediated inhibition of Mer by an Axl/Mer dual inhibitor led to retinal toxicity in mice, whereas selective Axl inhibition by compound 1 did not. On the other hand, compound 1 showed low membrane permeability. Here, we designed and synthesized a novel series of 5,6,7,8-tetrahydropyrido[3,4-d]pyrimidine derivatives and evaluated their Axl and Mer inhibitory activities, leading to identification of ER-001259851-000 as a potent and selective Axl inhibitor with drug-likeness and a promising pharmacokinetic profile in mice.

Axl 和 Mer 是 TAM（Tyro3-Axl-Mer）受体酪氨酸激酶家族的成员。以前，我们报道了 Axl/Mer 双重抑制剂对 Mer 的酶介导抑制导致小鼠视网膜毒性，而化合物1 的选择性 Axl 抑制则没有。另一方面，化合物1显示出低的膜渗透性。在这里，我们设计并合成了一种新型系列-5,6,7,8-四氢吡啶并[3,4的d ]嘧啶衍生物及其评价了它们的Axl和Mer的抑制活性，从而导致识别ER-001259851 - 000作为有效的和具有药物相似性和有希望的小鼠药代动力学特征的选择性 Axl 抑制剂。