Enantiopure (P)- and (M)-3,14-bis(o-hydroxyaryl)tetrahydrobenzo[5]helicenediols and their helicene analogues: Synthesis, amplified circularly polarized luminescence and catalytic activity in asymmetric hetero-Diels–Alder reactions
作者:Lei Fang、Meng Li、Wei-Bin Lin、Chuan-Feng Chen
DOI:10.1016/j.tet.2018.10.047
日期:2018.12
exhibited more intense CPL with amplified glum, which might be attributed to the more rigid structure of PhOH-[5]HOLs. However, rigid PhOH-[5]HOLs was less effective in the catalytic asymmetric hetero-Diels–Alder (HAD) reactions than those of ArOH-H[5]HOLs with the flexible tetrahydro[5]helicene backbone that could adjust conformation to suit the substrates. Therefore, the helical chirality amplification
三对对映纯(P)-和(M)-3,14-双(邻羟基芳基)四氢苯并[5] hel烯二醇(ArOH-H [5] HOLs)和对映异构体(P)-和(M)-3设计合成了14,双(邻羟基苯基)苯并[5]]烯二醇(PhOH- [5] HOLs)。结果发现,与aroH的-H相比[5] HOLs,PhOH- [5] HOLs不仅表现出在吸收和发射光谱明显红移,而且还与放大显示出更强烈的CPL克LUM,这可能归因于PhOH- [5] HOL的刚性更高。然而,刚性的PhOH- [5] HOLs在催化不对称杂Diels-Alder(HAD)反应中的效率不如具有可调节构象的四氢[5]螺旋烯骨架的ArOH-H [5] HOLs。基板。因此,通过调节螺旋分子的刚性和柔性结构可以有效地实现螺旋手性的扩增和手性转移,这可以为优化螺旋型衍生物的结构提供有用的策略,以用于其在手性材料和不对称催化中的应用。