Thieno[2,3-d]pyrimidine-3-acetic Acids A New Class of Nonpeptide Endothelin Receptor Antagonists.
作者:Nobuo CHO、Yoshi NARA、Mioko HARADA、Tsukasa SUGO、Yasushi MASUDA、Akemi ABE、Keiji KUSUMOTO、Yasuaki ITOH、Tetsuya OHTANI、Toshifumi WATANABE、Shunichi FURUYA
DOI:10.1248/cpb.46.1724
日期:——
On the basis of structural information for the cyclic hexapeptide endothelin (ET) receptor antagonist, TAK-044, a series of thieno[2, 3-d]pyrimidine-2, 4-dione derivatives bearing a carboxyl group and aromatic rings that were important for receptor binding were designed, synthesized, and evaluated for ET receptor binding affinities and inhibitory activities against ET-induce vasconstriction.Optimization of each substituent in the thieno[2, 3-d]pyrimidine ring led to the discovery of a novel and potent nonpeptide ET receptor antagonist, 6-(4-methoxymethoxyphenyl)-5-methylsulafonylminomethyl-1-(2-methylthiobenzyl)-2, 4-dioxo-1, 2, 3, 4-tetrahydrothieno[2, 3-d]pyrimidine-3-acetic acid (32 g), which binded to human ETA and ETB receptor subtypes with affinities (IC50) of 7.6 and 100 nM, respectively.Compound 32 g effectively antagonized ET-induced vasconstriction and the inhibitory effect mediated by the ETB receptor was more potent than that of bosentan, while the inhibitory effect mediated by the ETA receptor was slightly less potent than that of bosentan.
根据环六肽内皮素(ET)受体拮抗剂 TAK-044 的结构信息,我们设计、合成并评估了一系列噻吩并[2,3-d]嘧啶-2,4-二酮衍生物,这些衍生物带有对受体结合非常重要的羧基和芳香环,它们与 ET 受体的结合亲和力以及对 ET 引起的血管收缩的抑制活性。通过优化噻吩并[2,3-d]嘧啶环上的每个取代基,发现了一种新型、强效的非肽类 ET 受体拮抗剂,即 6-(4-甲氧基甲氧基苯基)-5-甲基磺酰基氨甲基-1-(2-甲硫基苄基)-2-(4-二氧代-1,2-嘧啶并[2,3-d]嘧啶环)、该物质与人类 ETA 和 ETB 受体亚型的结合亲和力(IC50)分别为 7.化合物 32 g 能有效拮抗 ET 诱导的血管收缩,由 ETB 受体介导的抑制作用强于波生坦,而由 ETA 受体介导的抑制作用略低于波生坦。