Dioxotriazine derivatives as a new class of P2X3 receptor antagonists: Identification of a lead and initial SAR studies
作者:Hiroyuki Kai、Tohru Horiguchi、Takayuki Kameyama、Kentaro Asahi、Takeshi Endoh、Sae Jikihara、Tsuyoshi Hasegawa、Satoru Tanaka、Azusa Nozu、Chie Takeyama、Maki Tomari、Fumiyo Takahashi、Naomi Tamura、Shigenori Yagi、Tetsuji Itoh、Yasuyoshi Isou
DOI:10.1016/j.bmcl.2021.127833
日期:2021.4
P2X3 receptor is an ATP-gated ion channel, mainly localized on peripheral sensory neurons. Currently, several clinical trials are being conducted with P2X3 receptor antagonists for the treatment of chronic pain or cough. To identify a P2X3 lead compound, we reexamined the HTS evaluation compounds and selected dioxotriazine derivatives from which we identified a hit compound. As a result of the hit-to-lead
P2X 3受体是一种 ATP 门控离子通道,主要位于外周感觉神经元。目前,正在使用 P2X 3受体拮抗剂治疗慢性疼痛或咳嗽进行多项临床试验。为了鉴定 P2X 3先导化合物,我们重新检查了 HTS 评估化合物并选择了二氧代三嗪衍生物,从中我们鉴定了一种命中化合物。由于命中先导 SAR,我们获得了对 P2X 3受体具有中等抑制作用的先导化合物1 (IC 50 , 128 nM)。这种先导化合物的效力和 PK 曲线的进一步改进最终导致了选定的化合物74(P2X 3 IC50 , 16.1 nM;P2X 2/3 IC 50 , 2931 nM),在神经性疼痛的大鼠坐骨神经部分结扎模型 (ED 50 , 3.1 mg/kg) 中显示出对口服给药的异常性疼痛有很强的镇痛作用。