have been prepared by various synthetic methods. Rhodium(I) complexes of 3 and 8 showed high catalytic activity for hydrogenation of various kinds of prochiral ketones, which were reduced smoothly to the corresponding optically active hydroxy compounds, under hydrogen at atmospheric pressure and ambient temperature. The neutral rhodium(I) complexes (diphosphine-RhN) hydrogenated α-ketoamides and α-ketopantolactone
两种光学活性的全烷基
二膦,2,3- O-异亚丙基-2,3-二羟基-1,4-双(二烷基膦基)
丁烷(Rdiop 3)和N-(N'-取代的
氨基甲酰基-4-
二环己基膦基-2 -dicyclohexylphosphinomethylpyrrolidine(R-Cycapp 8),已通过各种合成方法制备,3和8的
铑(I)配合物对各种前手性酮的氢化显示出高催化活性,并顺利还原为相应的旋光羟基化合物在大气压和环境温度下于
氢气中。中性
铑(I)络合物(
二膦-Rh N)以相当高的光学收率(66–77%ee)氢化α-酮酰胺和α-酮基内酯。在N-(α-酮酰基)-α-
氨基酯的氢化反应中,Cydiop-Rh N催化剂与diop-Rh N体系形成明显的对比。在N-(
苯乙醛基)-(S)-α-苯丙
氨酸的甲酯的氢化中,通过底物的手性中心几乎没有双不对称诱导而获得72%de。