A New Class of Intramolecularly Hydrogen-Bonded Dendrons Based on a 2-Methoxyisophthalamide Repeat Unit
作者:Christopher J. Gabriel、Matthew P. DeMatteo、Noel M. Paul、Tomohisa Takaya、Terry L. Gustafson、Christopher M. Hadad、Jon R. Parquette
DOI:10.1021/jo061351k
日期:2006.11.1
The synthesis and conformational properties of folded dendrons based on a 2-methoxyisophthalamide (2-OMe-IPA) repeat unit are described. The hydrodynamic properties of dendrons preorganized via the syn-syn conformational preference of 2-methoxyisophthalamide are compared with 2,6-pyridinedicarboxamide (2,6-pydic) analogues. The effect of subtle differences in the nature of the conformational equilibria
描述了基于2-甲氧基间苯二甲酰胺(2-OMe-IPA)重复单元的折叠树突的合成和构象性质。将通过2-甲氧基间苯二甲酰胺的顺式-顺式构象偏好预先组织的树枝状分子的流体力学性质与2,6-吡啶二甲酰胺(2,6-吡啶)类似物进行比较。通过1 H-DOSY NMR光谱和计算方法研究了2-OMe-IPA和2,6-pydic重复单元内存在的构象平衡性质的细微差异对相应树突的整体结构性质的影响。时间分辨荧光各向异性(TRFA)测量。而syn-syn2-OMe-IPA支链重复单元的优先选择完全通过分子内氢键相互作用来稳定,在2,6-pydic系统中的优先选择是分子内氢键和偶极子最小化效应的结果。但是,对于两个树突系列,非特异性的疏溶剂压缩在确定流体力学性质方面比在重复单元的构象平衡中依赖于溶剂的转变更为重要。