The Entrapment of Chiral Guests with Gated Baskets: Can a Kinetic Discrimination of Enantiomers Be Governed through Gating?
作者:Bao-Yu Wang、Sandra Stojanović、Daniel A. Turner、Tanya L. Young、Christopher M. Hadad、Jovica D. Badjić
DOI:10.1002/chem.201204344
日期:2013.4.8
The capacity of gated hosts for controlling a kinetic discrimination between stereoisomers is yet to be understood. To conduct corresponding studies, however, one needs to develop chiral, but modular and gated hosts. Accordingly, we used computational (RI‐BP86/TZVP//RI‐BP86/SV(P)) and experimental (NMR/CD/UV/Vis spectroscopy) methods to examine the transfer of chirality in gated baskets. We found that
门控主体控制立体异构体之间动力学区分的能力还有待了解。为了进行相应的研究,需要开发一种手性的,模块化的和门控的宿主。因此,我们使用了计算方法(RI-BP86 / TZVP // RI-BP86 / SV(P))和实验方法(NMR / CD / UV / Vis光谱)来检查门控篮子中手性的传递。我们发现,将相同种类的立体中心放在边缘(R 1 = CH 3,所谓的底部)和/或顶部酰胺位置(R 2 =仲丁基)会引导门的螺旋排列成P或M型螺旋桨方向。在1的协助下1 H NMR光谱,我们量化了(R)-和(S)-1,2-二溴丙烷5对篮(S 3b / P)-2,(S 3t / M)‐3和(S 3bt / P)‐4。有趣的是,每个购物篮都有一个 ≤1.3kcal mol -1),但对于捕获对映异构体(R / S)-5具有可比性(de <10%)。在动力学方面,篮筐(S 3b / P)−2在底部具有一组S立