Novel chiral amidophosphine-phosphinite compounds, which are present in (R) and (S) form, of the general formula
wherein R1 signifies alkyl, cycloalkyl or aralkyl, R2 signifies alkyl, cycloalkyl, aralkyl or aryl and R3 and R4 each independently signify alkyl, cycloalkyl, aralkyl, aryl or heteroaryl or R3 and R4 together with the respective phosphorus atom signify a 9-dibenzophospholyl, 9-phosphabicyclo[3.3.1]nonyl or 9-phosphabicyclo[4.2.1]nonyl group and * denotes a chiral center, are manufactured by reacting a compound of the general formula R1C(OH)—CONHR2 (III) with a disubstituted chlorophosphane of the general formula R3R4PCl (IV) in a solvent and in the presence of a base. As ligands the amidophosphine-phosphinite compounds in accordance with the invention form complexes with Group VIII transition metals, especially with rhodium, iridium, ruthenium and palladium, and optionally with further ligands, and such complexes are likewise an object of the present invention; they can be used as catalysts for enantioselective reactions, especially for asymmetric hydrogenations, enantioselective hydrogen displacements and allylic substitution reactions.
一种新型手性酰胺膦-
膦酸酯化合物,以(R)和(S)形式存在,其通式为R1表示烷基,环烷基或芳基烷基,R2表示烷基,环烷基,芳基烷基或芳基,R3和R4各自独立表示烷基,环烷基,芳基烷基,芳基或杂环芳基,或R3和R4与相应的
磷原子一起表示9-
二苯基膦杂环、9-膦杂双环[3.3.1]壬基或9-膦杂双环[4.2.1]壬基,*表示手性中心。该化合物可通过在溶剂和碱的存在下将通式为R1C(OH)-CONHR2(III)的化合物与通式为R3R4PCl(IV)的二取代
氯膦反应制备而成。作为
配体,本发明中的酰胺膦-
膦酸酯化合物与第VIII族过渡
金属,特别是
铑、
铱、
钌和
钯,以及可选的其他
配体形成配合物,这些配合物同样是本发明的对象;它们可用作对映选择性反应的催化剂,特别是用于不对称氢化、对映选择性氢位移和烯丙基取代反应。