Hydrolytic Metalloenzyme Models. Metal Ion Dependent Site-Selective Acylation of Hydroxyl Groups of Bis-Imidazole Ligands Catalyzed by Zn<sup>2+</sup>and Cu<sup>2+</sup>in the Reaction with<i>p</i>-Nitrophenyl 2-Pyridinecarboxylate in a Cationic Surfactant Micelle
作者:Kenji Ogino、Nobuyuki Kashihara、Toshitomo Ueda、Toshihide Isaka、Toshiharu Yoshida、Waichiro Tagaki
DOI:10.1246/bcsj.65.373
日期:1992.2
Co-micelles of hexadecyltrimethylammonium bromide and a lipophilic bis-imidazole ligand, 1-dodecyl-4-hydroxymethyl-α-(1-dodecyl-2-imidazolyl)-2-imidazolemethanol (4) having two primary and secondary hydroxyl groups, together with the co-micelles of the related lipophilic ligands, were investigated for their catalytic activities in the hydrolysis of p-nitrophenyl 2-pyridinecarboxylate (PNPP) in the
十六烷基三甲基溴化铵和亲脂性双咪唑配体的共胶束,1-十二烷基-4-羟甲基-α-(1-十二烷基-2-咪唑基)-2-咪唑甲醇(4)具有两个伯羟基和仲羟基,连同研究了相关亲脂性配体的共胶束在 Zn2+ 或 Cu2+ 存在下对 2-吡啶羧酸对硝基苯酯 (PNPP) 水解的催化活性。动力学和产物分析表明,该反应通过从PNPP到配体羟基的转酰基作用进行:金属离子络合物,发生转酰基作用的活性络合物是Zn2+的2 : 1和1 : 1络合物和1 : 1的络合物。 Cu2+ 的复合物。对于配体 4,发现转酰化具有高度的位点选择性,即 它主要发生在带有 Zn2+ 的仲羟基上,而分别发生在带有 Cu2+ 的伯羟基上。根据...的协调结构讨论了这种选择性。