Absolute Configuration Assignment from Optical Rotation Data by Means of Biphenyl Chiroptical Probes
作者:Stefania Vergura、Patrizia Scafato、Sandra Belviso、Stefano Superchi
DOI:10.1002/chem.201806435
日期:2019.4.17
the assignment of the absolute configuration of chiral 2‐alkyl‐substituted carboxylic acids and primary amines by [α]D measurements has been developed. The method requires the conversion of the chiral acids or amines into the corresponding 4,4′‐disubstituted biphenylamides or biphenylazepines, respectively. In these derivatives a central‐to‐axial chirality transfer induces a preferred torsion in the biphenyl
已开发出一种非经验方法,可通过[ α ] D测量来确定手性2烷基取代的羧酸和伯胺的绝对构型。该方法需要将手性酸或胺分别转化为相应的4,4'-二取代联苯酰胺或联苯a庚因。在这些衍生物中,从中心到轴的手性转移在联苯部分中引起了较好的扭转,这是由ECD光谱中联苯A谱带的符号所揭示的。通过在联苯部分上进行4,4'取代,可获得A带的红移,从而导致其对旋光性的相对贡献增加。这允许可靠地建立[ α ] D之间的直接相关性。征兆,联苯扭曲,然后是底物的绝对构型。因此,该方法构成了一种真正实用且可靠的方法,可通过简单直接的[ α ] D测量来确定手性羧酸和伯胺的绝对构型,该方法可通过常规仪器(如旋光仪)轻松获得。