Synthesis of Highly Twisted, Nonplanar Aromatic Macrocycles Enabled by an Axially Chiral 4,5-Diphenylphenanthrene Building Block
作者:Yuanming Li、Akiko Yagi、Kenichiro Itami
DOI:10.1021/jacs.9b13549
日期:2020.2.12
The synthesis, structures, and properties of highly twisted, nonplanar aromatic macrocycles are described. These macrocycles with an approximately 90° twist angle were synthesized by an effective synthetic approach through a quadruple Suzuki-Miyaura coupling of 4,5-bisarylphenanthrene as a novel axially chiral nonplanar building block. By varying the cross-coupling partner as the spacer, a family of
描述了高度扭曲的非平面芳香大环的合成、结构和性质。这些扭转角约为 90° 的大环化合物是通过一种有效的合成方法通过 4,5-双芳基菲的四重 Suzuki-Miyaura 偶联合成的,作为一种新型的轴向手性非平面结构单元。通过改变作为间隔物的交叉偶联伙伴,合成了一系列扭曲的大环,从而可以系统地研究间隔物对大环形状和光物理特性的影响。例如,一种独特的大环聚集诱导发射 (AIE) 发射器很容易合成,其具有双四苯基乙烯单元作为间隔物。此外,由于其构象受限的扭曲结构,3,6-二取代-1,8-萘二甲酰亚胺掺入的大环显示出显着的溶剂化荧光显色性和高荧光量子产率。这些大环化合物优异的构象稳定性进一步实现了完整的对映体拆分和表征。大环的外消旋势垒通过实验确定并得到 DFT 计算的支持。