Cleavage of models for RNA mediated by a diZn(II) complex of bis[1,4-<i>N</i><sub>1</sub>,<i>N</i><sub>1</sub>′(1,5,9-triazacyclododecanyl)]butane in methanol and ethanol
作者:C. Tony Liu、Stephanie A. Melnychuk、Chaomin Liu、Alexei A. Neverov、R. Stan Brown
DOI:10.1139/v09-026
日期:2009.5
The cleavage of seven RNA model 2-hydroxypropyl aryl phosphates (1) catalyzed by a dinuclear Zn(II) complex of bis[1,4-N1,N1′(1,5,9-triazacyclododecanyl)]butane (4) was studied in methanol and ethanol at 25 °C under pH controlled conditions. The results are compared with what was reported earlier for the dinuclear Zn(II) complex of the lower homologue bis[1,3-N1,N1′(1,5,9-triazacyclododecanyl)]propane
研究了双 [1,4-N1,N1'(1,5,9-三氮杂环十二烷基)]丁烷 (4) 的双核 Zn(II) 复合物催化的七种 RNA 模型 2-羟丙基芳基磷酸酯 (1) 的裂解在 pH 控制的条件下,在 25 °C 的甲醇和乙醇中。结果与之前报道的低级同源物双[1,3-N1,N1'(1,5,9-三氮杂环十二烷基)]丙烷的双核 Zn(II) 络合物的结果进行了比较 (3)。在甲醇中,较高的同系物表现出与具有较差芳氧基离去基团的底物的饱和结合。对于良好的离去基团,在所研究的催化剂浓度范围内观察到 kobs 与复合物浓度的线性相关性,而没有饱和结合。在乙醇中,观察到催化剂的活性形式 ((RO-):Zn(II)2:4) 与所有底物之间的强饱和结合,在两种溶剂中观察到的结果与较低 (RO–):Zn(II)2:3 同系物的报告结果相似。为 (RO-):Zn(II)2:4-催化的氯化物提供了能量学计算。