Synthesis, SAR and selectivity of 2-acyl- and 2-cyano-1-hetarylalkyl-guanidines at the four histamine receptor subtypes: a bioisosteric approach
作者:Roland Geyer、Patrick Igel、Melanie Kaske、Sigurd Elz、Armin Buschauer
DOI:10.1039/c3md00245d
日期:——
In the search for potential bioisosteres of the 4-imidazolyl ring in acylguanidines (e.g. UR-AK24), known to possess affinity to several histamine receptor subtypes (HxR, x = 1–4), and cyanoguanidine-type H4R agonists (e.g. UR-PI376), the contribution of various heterocycles to agonism, antagonism and HR subtype selectivity was studied (recombinant human H1,2,3,4Rs, isolated guinea pig organs (H1R, H2R)). While minor structural modifications of UR-PI376 analogues were not tolerated regarding H4R agonism, in the case of the acylguanidines, a 1,2,4-triazole ring shifted the selectivity toward the H2R.
在寻找酰基胍类(如 UR-AK24)(已知对几种组胺受体亚型(HxR,x = 1-4)具有亲和力)和氰基胍类 H4R 激动剂(如 UR-PI376)中 4-咪唑环的潜在生物异构体时,研究了各种杂环对激动作用、拮抗作用和 HR 亚型选择性的贡献(重组人 H1、2、3、4R,分离的胍类)。例如 UR-PI376),研究了各种杂环化合物对激动、拮抗和组胺受体亚型选择性的贡献(重组人 H1、2、3、4Rs,离体豚鼠器官(H1R、H2R))。UR-PI376类似物的微小结构改性对H4R的激动作用没有影响,而对酰基胍类化合物来说,1,2,4-三唑环会使其对H2R的选择性发生改变。