We report the discovery of 7-oxo-2,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridine derivatives as a novel class of receptor interacting protein 1 (RIP1) kinase inhibitors. On the basis of the overlay study between HTS hit 10 and GSK2982772 (6) in RIP1 kinase, we designed and synthesized a novel class of RIP1 kinase inhibitor 11 possessing moderate RIP1 kinase inhibitory activity and P-gp mediated efflux. The optimization of the core structure and the exploration of appropriate substituents utilizing SBDD approach led to the discovery of 22, a highly potent, orally available, and brain-penetrating RIP1 kinase inhibitor with excellent PK profiles. Compound 22 significantly suppressed necroptotic cell death both in mouse and human cells. Oral administration of 22 (10 mg/kg, bid) attenuated disease progression in the mouse experimental autoimmune encephalomyelitis (EAE) model of multiple sclerosis (MS). Moreover, analysis of structure–kinetic relationship (SKR) for our novel chemical series was also discussed.

中文翻译：

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7-Oxo-2,4,5,7-四氢-6 H-吡唑并[3,4- c ]吡啶衍生物的发现，有效，可口服和可穿透脑的受体相互作用蛋白1（RIP1）激酶抑制剂：分析动力学关系图

我们报告发现7-oxo-2,4,5,7-四氢-6 H-吡唑并[3,4- c ]吡啶衍生物作为一种新型的受体相互作用蛋白1（RIP1）激酶抑制剂。在HTS命中10与RIP1激酶的GSK2982772（6）之间的叠加研究的基础上，我们设计并合成了具有中度RIP1激酶抑制活性和P-gp介导外排的新型RIP1激酶抑制剂11。核心结构的优化和利用SBDD方法探索适当取代基的发现导致发现22，一种具有出色PK谱的高效，口服，可穿透脑的RIP1激酶抑制剂。化合物22显着抑制小鼠和人类细胞中的坏死性细胞死亡。在多发性硬化症（MS）小鼠实验性自身免疫性脑脊髓炎（EAE）模型中，口服22（10 mg / kg，bid）的剂量可减轻疾病的进展。此外，还讨论了我们新化学系列的结构动力学关系（SKR）分析。