Exploitation of an additional hydrophobic pocket of σ1 receptors: Late-stage diverse modifications of spirocyclic thiophenes by C–H bond functionalization
作者:Christina Meyer、Benedikt Neue、Dirk Schepmann、Shuichi Yanagisawa、Junichiro Yamaguchi、Ernst-Ulrich Würthwein、Kenichiro Itami、Bernhard Wünsch
DOI:10.1039/c1ob06149f
日期:——
nM; 4a: Ki = 1.0 nM). This result indicates that an aryl moiety in position 1 is well tolerated by the σ1receptor protein. The substitution pattern of the additional phenyl moiety has only weak effects on the σ1 affinity. Even ligands 3f and 4h with extended naphthyl residue show high σ1 affinity. However, decrease of σ1 affinity by extension of the π-system to a biphenylyl substituent (4j: Ki = 30
该σ假说1受体会容忍在螺环系统的1位附加的芳基部分是基于螺环的吡唑衍生物,的σ药效模型1受体配体和DFT计算。在合成的最后步骤中引入所述芳基残基的策略允许一大组不同的配体的为σ的疏水口袋的开发制备1受体蛋白。催化剂体系PdCl 2 /2,2'-联吡啶/ Ag 2 CO 3能够将各种芳基引入螺环噻吩衍生物5和6的α位置上,从而提供目标芳基附加的螺环噻吩3和4。虽然σ 1 1-苯基取代的螺环的噻吩的亲和力3A和4A与σ相比稍微降低1所述非芳基化化合物的亲和力5和6,这两个化合物代表非常有效的σ 1受体配体(3A:ķ我= 4.5 nM;4a:K i= 1.0nM)。该结果表明,σ1受体蛋白对1位的芳基部分具有良好的耐受性。附加苯基部分的取代图案具有仅在σ作用较弱1的亲和力。甚至配体3F和4H具有扩展萘基残基显示出高σ 1倍的亲和力。然而,σ的减少1倍通过扩展的π系统的一种联苯基取代基的亲和性(4J:ķ我=