The syntheses of a wide range of novel C 1-symmetric chelating diphosphanes with stereogenic axes are reported. These ligands feature identical or different phosphanyl groups supported on diverse atropisomeric templates based on the interconnection of five-membered heteroaromatic and six-membered carbocyclic rings. Easy synthetic accessibility, independent tunability of the electronic and steric properties of the two phosphane donors, the low cost and the good stereoselection ability of some of them obtained in an enantiopure state are the main advantageous features of this class of ligands.
报道了合成一系列具有手性轴的一对一配位
二膦的新方法。这些
配体具有相同的或不同的膦基团,它们通过连接五元杂芳香环和六元碳环的不同
联苯骨架来支撑。这些
配体的合成简便,可以独立调节两个膦给体的电子和空间性质,成本低廉,并且在某些情况下可以获得高立体选择性,这些是这类型
配体的主要优势。