Hybridization of Long Pyridine-Dicarboxamide Oligomers into Multi-Turn Double Helices: Slow Strand Association and Dissociation, Solvent Dependence, and Solid State Structures
作者:Benoit Baptiste、Jiang Zhu、Debasish Haldar、Brice Kauffmann、Jean-Michel Léger、Ivan Huc
DOI:10.1002/asia.200900713
日期:2010.4.7
was also found to hybridize into a double helix but with reduced Kdim values and faster kinetics compared to its Boc‐terminated analogue. Combined with previous studies, the results presented here frame a global understanding of the hybridization of these pyridinecarboxamide oligomers and provide useful guidelines for the design of other artificial double helices.
逐步合成了由5、7、9、11或13个单元组成的在所有吡啶环和叔丁基氨基甲酸酯末端基团上带有4-异丁氧基链的2,6-二氨基吡啶和2,6-吡啶二羧酸的低聚酰胺具有11个具有氨基甲酸苄酯端基的单体。已获得所有五种Boc终止的化合物的晶体结构,并显示出高度规则且保守的双螺旋杂交基序,在13聚体中最多可进行3个完整的旋转。四个吡啶单元跨越一个螺旋圈,并定义大约7Å的螺旋间距。在CDCl 3中进行的溶液研究表明,Boc端接的低聚物在该溶剂中强烈杂交,并且K dim值随低聚物长度的增加而增加。所述ķ暗淡的值是31000和7×10 5 大号摩尔-1的7聚体和9聚物,分别与过高要通过NMR为11聚体和13聚体测定。随着寡聚物长度的增加,杂交和解离动力学在2 m M下以降低的速率进行。对于7 mer,该速率快于几分钟;对于9 mer,该速率快于数小时;对于11 mer和13 mer,该速率快于几天。在[D