A comparison of the asymmetric hydrogenation catalyzed by rhodium complexes containing chiral ligands with a binaphthyl unit and those with a 5,5′,6,6′,7,7′,8,8′-octahydro-binaphthyl unit
作者:Fu-Yao Zhang、Wai Him Kwok、Albert S.C. Chan
DOI:10.1016/s0957-4166(01)00399-8
日期:2001.9
The chiral ligands H8–BINAPO and H8–BDPAB were synthesized by reacting chlorodiphenylphosphine with H8–BINOL and H8–BINAM, respectively. Applications of these ligands in the Rh-catalyzed enantioselective hydrogenation of a variety of (Z)-acetamido-3-arylacrylic acid methyl esters provided chiral amino acid derivatives with good to excellent enantioselectivities (H8–BINAPO: up to 84.0% e.e.; H8–BDPAB:
通过使氯二苯基膦分别与H 8 -BINOL和H 8 -BINAM反应合成手性配体H 8 -BINAPO和H 8 -BDPAB 。这些配体在多种(Z)-乙酰氨基-3-芳基丙烯酸甲酯的Rh催化对映选择性氢化中的应用提供了具有良好至优异对映选择性的手性氨基酸衍生物(H 8 -BINAPO:高达84.0%ee; H 8 –BDPAB:ee高达97.1%)。在乙酰胺基丙烯酸的氢化中,当使用[Rh(H 8 -BDPAB)] +催化剂时,获得了99%ee 。[Rh(H 8)的催化活性和对映选择性-BINAPO)] +和[Rh(H 8 -BDPAB)] +明显优于使用相应的含BINAPO(最高64%ee)和BDPAB(最高92.6%ee)的铑催化剂获得的那些。