Novel cage-typecyclophanes, which are constructed with two rigid macrocyclic skeletons, tetraaza[3.3.3.3]paracyclophanes, and four bridging segments composed of β-l-aspartyl-l-aspartyl residues and β-d-aspartyl residues individually, were prepared. Chiral host-guest interactions between the hosts and a hydrophobic guest, pamoic acid, were examined by circular dichroism spectroscopy in aqueous media
behavior of the cage-type hosts toward fluorescent guests, such as 8-anilinonaphthalene-1-sulfonate and 6-p-toluidinonaphthalene-2-sulfonate, was examined in comparison with those demonstrated by the corresponding non-cage hosts in aqueousmedia. The microenvironmental polarity around the fluorescent guests and their fluorescence polarization values in the presence of the cage-type hosts revealed that
新型笼型环烷,由两个刚性大环骨架,四氮杂[3.3.3.3]对环环烷和四个桥接片段组成,这些桥接片段由β-1-天冬氨酰基-1-天冬氨酰或β-d-天冬氨酰基-d-天冬氨酰残基组成准备[分别为(-)- 1和(+)- 1 ]。这些笼型环烷的结构和不对称性质通过1 H NMR和圆二色性(CD)光谱进行了表征。笼型宿主对荧光客体的客体结合行为,例如8-苯胺基萘-1-磺酸盐和6- p与对甲苯基萘-2-磺酸盐进行了比较,并与相应的非笼状基质在水性介质中的结果进行了比较。在笼型宿主存在下,荧光客体周围的微环境极性及其荧光极化值表明,这些客体分子被掺入非极性宿主腔中,并且其旋转运动受到很大限制。此外,通过CD光谱法检查了宿主与疏水性客体棕榈酸(PA)之间的手性宿主-客体相互作用。PA分别在(-)- 1和(+)- 1的情况下经历立体化学变化,以呈现P-和M-螺旋构型。