Conformational Restriction and Enantioseparation Increase Potency and Selectivity of Cyanoguanidine-Type Histamine H<sub>4</sub> Receptor Agonists
作者:Roland Geyer、Uwe Nordemann、Andrea Strasser、Hans-Joachim Wittmann、Armin Buschauer
DOI:10.1021/acs.jmedchem.6b00120
日期:2016.4.14
-yl)butyl]-3-[2-(phenylsulfanyl)ethyl]guanidine (UR-PI376, 1) is a potent and selective agonist of the human histamine H4 receptor (hH4R). To gain information on the active conformation, we synthesized analogues of 1 with a cyclopentane-1,3-diyl linker. Affinities and functional activities were determined at recombinant hHxR (x: 1–4) subtypes on Sf9 cell membranes (radioligand binding, [35S]GTPγS,
2-氰基-1- [4-(1- ħ咪唑-4-基)丁基] -3- [2-(苯基硫基)乙基]胍(UR-PI376,1)是人组胺的有效和选择性的激动剂H 4受体(hH 4 R)。为了获得有关活性构象的信息,我们合成了具有环戊烷-1,3-二基接头的1的类似物。亲和力和功能活性是在Sf9细胞膜上的重组hH x R(x:1-4)亚型(放射配体结合,[ 35 S]GTPγS或GTPase分析)上确定的,部分是在人或小鼠H 4 R的荧光素酶分析中确定的(HEK-293细胞)。最有效的H 4通过手性HPLC分离了14个外消旋体中的R激动剂,得到了8个对映体纯的化合物。根据中间体的X射线结构和立体控制的合成途径分配构型。(+)-2-氰基-1-[反式-(1 S,3 S)-3-(1 H-咪唑-4-基)环戊基]甲基} -3- [2-(苯硫基)乙基]胍((1小号,3小号)-ur-RG98,39A)是最有效的ħ 4在这一系列R激动剂(EC