Selective A<sub>3</sub> Adenosine Receptor Antagonists: Water-Soluble 3,5-Diacyl-1,2,4-trialkylpyridinium Salts and Their Oxidative Generation from Dihydropyridine Precursors
作者:Rongyuan Xie、An-Hu Li、Xiao-Duo Ji、Neli Melman、Mark E. Olah、Gary L. Stiles、Kenneth A. Jacobson
DOI:10.1021/jm990234x
日期:1999.10.1
4-dihydropyridine analogue, 25, to the corresponding pyridinium derivative, 23 (K(i) 695 nM), suggesting a prodrug scheme. Homologation of the N-methylpyridinium derivatives to N-ethyl and N-propyl at the 1-position caused a progressive reduction in the affinity at A(3) receptors. Modifications of the alkyl groups at the 2-, 3-, 4-, and 5-positions failed to improve potency in binding at A(3) receptors. The pyridinium
A(3) 腺苷受体拮抗剂因其潜在的抗炎、抗哮喘和抗缺血特性而受到人们的关注。我们发现3,5-二酰基-1,2,4-三烷基-6-苯基吡啶鎓衍生物构成一类新型选择性A(3)腺苷受体拮抗剂。此类拮抗剂(包含 3-硫酯)的结构-活性关系已被探索。该组中最有效的类似物是 2, 4-二乙基-1-甲基-3-(乙硫基羰基)-5-乙氧基羰基-6-苯基碘化吡啶 (11),其具有平衡抑制常数 (K(i)) 值在中国仓鼠中表达的人 A(3) 受体(与 [(125)I]AB-MECA (N(6)-(4-氨基-3-碘苄基)-5'-N-甲基氨甲酰基腺苷结合)的浓度为 219 nM卵巢 (CHO) 细胞,大鼠脑 A(1) 和 A(2A) 受体以及重组人 A(2B) 受体 >10 microM。化合物11可以通过用碘或在大鼠脑匀浆存在下氧化相应的3,5-二酰基-1,2,4-三烷基-6-苯基-1,4-二氢吡啶24而产生。 6-环戊基类似物显示,在从