Rh(I)-new chiraldiphosphinite systems with terminal amino groups were very effective for asymmetrichydrogenation of dehydrodipeptides with free carboxyl group and a chiral carbon. The effectiveness of the diphosphinite catalysts strongly suggests the contribution of electrostatic effect to asymmetric induction.
Electrostatic interaction and induced fitting of the rhodium(I) complex coordinated by diphosphine ligand having an amino group in the diastereoselective hydrogenation of dehydrodipeptides
3-propanediyl]bis(diphenylphosphine) (DPP-AE) catalyst achieved an effective 1,4-asymmetricinduction and afforded high diastereoselectivity (max. 96% d.e.) in the hydrogenation of dehydrodipeptides in protic solvents. Activation parameters indicate the important role of the electrostaticinteraction for the asymmetricinduction in the hydrogenation. Structural study of the rhodium(I) DPP-AE complex by 31P NMR and
铑(I)-[2- [2-(2-(二甲基氨基)乙基] -1,3-丙二基]双(二苯基膦)(DPP-AE)催化剂实现了有效的1,4-不对称诱导并提供了高非对映选择性(最大96) %DE)在质子溶剂dehydrodipeptides的氢化。活化参数表明静电相互作用对于氢化中的不对称感应的重要作用。铑(I)DPP-AE配合物的结构研究通过31 P NMR和圆二色性光谱学表明,配合物的诱导拟合是由于配体(DPP-AE)与脱氢二肽之间的静电相互作用而发生的,从而改变了DPP-AE的主要偏构型。根据底物的手性中心的配合物。
Stereoselective synthesis of dipeptides by asymmetric reduction of dehydropeptides catalyzed by chiral rhodium complexes
作者:Dominique Meyer、Jean Claude Poulin、Henri B. Kagan、Huguette Levine-Pinto、Jean Louis Morgat、Pierre Fromageot
DOI:10.1021/jo01311a026
日期:1980.11
Yamagishi, Takamichi; Ikeda, Satoru; Yatagai, Masanobu, Journal of the Chemical Society. Perkin transactions I, 1988, p. 1787 - 1790