Hydrogen Bonding Makes a Difference in the Rhodium-Catalyzed Enantioselective Hydrogenation Using Monodentate Phosphoramidites
作者:Yan Liu、Christian A. Sandoval、Yoshiki Yamaguchi、Xue Zhang、Zheng Wang、Koichi Kato、Kuiling Ding
DOI:10.1021/ja063350f
日期:2006.11.1
generation of monodentate phosphoramidite ligands bearing a primary amine moiety was found to display comparable or better efficiency than bisphosphines in the Rh-catalyzed asymmetric hydrogenation of challenging substrates, such as (Z)-methyl alpha-acetoxyacrylate or (E)-beta-aryl itaconate derivatives, affording the corresponding hydrogenation products with excellent enantioselectivities (up to >99%
发现具有伯胺部分的新一代单齿亚磷酰胺配体在具有挑战性的底物(例如(Z)-α-乙酰氧基丙烯酸甲酯或(E)-β-)的 Rh 催化不对称氢化中显示出与双膦相当或更好的效率芳基衣康酸酯衍生物,提供具有优异对映选择性(高达> 99%ee)的相应氢化产物。发现催化剂中两个单齿配体之间分子间氢键 (HB) 的存在对于优异的催化剂性能至关重要。这一发现为使用这种类型的单齿亚磷酰胺配体设计和开发进一步的催化剂体系提供了基础。