Disclosed are substantially enantiomerically pure bis-phosphine compounds comprising a substantially enantiomerically pure chiral backbone linking two phosphine residues wherein one of the phosphine residues has three phosphorus-carbon bonds and the other phosphine residue has two phosphorus-carbon bonds and one phosphorus-nitrogen bond wherein the nitrogen is part of the chiral backbone. The compounds, which have exhibited surprising air stability, are useful as ligands for metal catalysts for asymmetric reactions and have demonstrated excellent results, in particular as rhodium complexes for asymmetric hydrogenation of enamide, itaconate, and &agr;-ketoester compounds. Also disclosed are novel processes for the preparation of the bis-phosphine compounds and novel intermediate compounds useful in the preparation of the bis-phosphine compounds.
本发明公开了含有基本对映异构体的
双膦化合物,其包括一个基本对映异构体纯度高的手性骨架,连接两个膦残基,其中一个膦残基具有三个
磷-碳键,另一个膦残基具有两个
磷-碳键和一个
磷-氮键,其中氮是手性骨架的一部分。这些化合物表现出惊人的空气稳定性,可用作
金属催化剂的
配体,用于不对称反应,并且已经展示出卓越的结果,特别是作为
铑配合物,用于不对称氢化烯酰胺、
顺丁烯二酸酯和α-
酮酸酯化合物。本发明还公开了制备
双膦化合物的新工艺和制备
双膦化合物的新中间体化合物。