electrically evoked contraction of the guinea-pig jejunum). It appeared that by comparison of homologous pairs the thiazolo derivatives have slightly higher activity than their oxazolo analogues. The most potent compound of these series is the 1-(2-thiazolo[4,5-c]pyridine)-4-n-propylpiperazine (3c) with pA2 = 7.25 (its oxazole analogue (4g) showed pA2 = 6.9). The structure-activity relationships for compounds
为了寻找新的非
咪唑组胺H3受体拮抗剂,一系列的1 [((2-
噻唑并
吡啶)-4-正丙基]
哌嗪,类似的1-[((2-
恶唑并
吡啶)-4-正丙基]]制备了
哌嗪,1-[((2-
苯并噻唑)-4-正丙基]
哌嗪和1-[((2-
苯并恶唑)4-正丙基]
哌嗪,并在体外对其作为H3受体拮抗剂进行了测试(电诱发的收缩)豚鼠空肠)。通过比较同源对,
噻唑洛衍
生物似乎比它们的
恶唑类似物具有更高的活性。这些系列中最有效的化合物是1-(2-
噻唑并[4,5-c]
吡啶)-4-正丙基
哌嗪(3c),pA2 = 7.25(其
恶唑类似物(4g)显示pA2 = 6.9)。