Flexible biphenyls have been applied as efficient and practical chiroptical probes for absolute configuration assignment to chiral primary amines. The mechanism of the central-to-axial chirality transfer from the amine moiety to the conformationally flexible biphenyl system has been determined by NMR and computational studies. This allowed proposing a general non-empirical rule in order to establish
柔性
联苯已被用作有效和实用的手性探针,用于绝对构型分配给手性
伯胺。从胺部分到构象柔性
联苯系统的中心到轴向手性转移的机理已通过NMR和计算研究确定。这允许提出一般的非经验规则,以便仅通过查看
联苯衍
生物的
ECD光谱中的250 nm A谱带的符号来确定
联苯的扭转,从而确定胺的绝对构型。该方法被证明是非常可靠和灵敏的,可以处理μmol规模的样品,并可以同时测定胺样品的绝对构型和对映体纯度。