Synthesis of a New Chiral Bisphospholane Ligand for the Rh(I)-Catalyzed Enantioselective Hydrogenation of Isomeric β-Acylamido Acrylates
作者:Jens Holz、Axel Monsees、Haijun Jiao、Jinsong You、Igor V. Komarov、Christine Fischer、Karlheinz Drauz、Armin Börner
DOI:10.1021/jo020453h
日期:2003.3.1
The highly stereoselective synthesis of a chiral silylphospholane has been described, which can be advantageously used as a building block under base-free conditions for the construction of diphosphines related to DuPHOS. The utility of silylphospholane is shown in the synthesis of a new bisphospholane ligand 1 (MalPHOS), which is characterized by a maleic anhydride backbone. The ligand forms with
已经描述了手性甲硅烷基膦酸酯的高度立体选择性的合成,其可以在无碱条件下有利地用作构建与DuPHOS有关的二膦的结构单元。在合成新的双膦环烷配体1(MalPHOS)中显示了甲硅烷基膦环烷的效用,该双膦环烷配体1的特征是马来酸酐骨架。配体与Rh(I)形成比类似Me-DuPHOS复合物具有更大咬合角P-Rh-P的复合物。两种配合物均已在具有药物相关性的不饱和α-和β-氨基酸前体的不对称氢化中进行了测试。在某些情况下,与Me-DuPHOS配合物相比,这种新型催化剂更具优势,特别是当使用(Z)构型的β-酰氨基丙烯酸酯作为底物时。