Synthesis, Chiral Resolution, and Absolute Configuration of Dissymmetric 4,15-Difunctionalized [2.2]Paracyclophanes
作者:Georg Meyer-Eppler、Rebecca Sure、Andreas Schneider、Gregor Schnakenburg、Stefan Grimme、Arne Lützen
DOI:10.1021/jo501212t
日期:2014.7.18
isomers. Here, we give an account of an efficient protocol to achieve this, which allows the synthesis of a broad variety of 4,15-disubstituted [2.2]paracyclophanes. Furthermore, we were able to resolve several of the racemic compounds via chiral HPLC and assign the absolute configurations of the isolated enantiomers by X-ray diffraction and/or by the comparison of calculated and measured CD-spectra.
尽管官能化的平面手性[2.2]对环环烷已经引起了广泛的关注,但假四元4,15-取代的[2.2]对环环烯的化学性质仍未得到很好的研究。这主要是由于这样的事实,即4,5-二溴官能[2.2]对环芳烷是多不易于比其构成伪卤素-金属交换反应的邻位或假对异构体。在这里,我们给出了实现此目的的有效协议,该协议允许合成各种4,15-二取代的[2.2]对环环烷。此外,我们能够通过手性HPLC拆分几种外消旋化合物,并通过X射线衍射和/或通过计算和测量的CD光谱的比较来指定分离的对映异构体的绝对构型。