The synthesis of two 2-formylquinolines is reported via the Skraup method followed by SeO2 oxidation. Each aldehyde is condensed with (1R,2R)-diaminocyclohexane and (R)-BINAM, yielding four enantiomerically-pure bis(imine–quinoline) ligands. The neutral ligands are reacted with ZnCl2 to give complexes with bis(bidentate) coordination of ZnCl2 units. X-Ray structural characterization of three complexes shows them to have a single-stranded helical motif, with M helicity, except in one case where a 1 : 1 mixture of M and P helices is seen. The ligands and complexes are further characterized spectroscopically by solution 1H and 13C NMR, UV-vis and ECD.
报告通过 Skraup 法和 SeO2 氧化法合成了两种 2-甲酰基
喹啉。每个醛与 (1R,2R)-二
氨基
环己烷和 (R)-BIN
AM 缩合,得到四个对映体纯度的双(
亚胺喹啉)
配体。这些中性
配体与 ZnCl2 反应,得到 ZnCl2 单元双(双叉)配位的配合物。三种配合物的 X 射线结构特征显示,它们具有单链螺旋图案,螺旋度为 M,只有一种情况例外,即 M 螺旋和 P 螺旋的混合度为 1:1。
配体和复合物的进一步光谱特征是溶液 1H 和 13C NMR、UV-vis 和
ECD。