Enantioselective Ir‐Catalyzed Hydrogenation of Minimally Functionalized Olefins Using Pyranoside Phosphinite‐Oxazoline Ligands
作者:Javier Mazuela、Oscar Pàmies、Montserrat Diéguez
DOI:10.1002/ejic.201201485
日期:2013.4.12
Pyranoside phosphinite-oxazoline ligands prepared from readily available (+)-D-glucosamine were applied to the Ir-catalyzed asymmetric hydrogenation of minimally functionalized olefins. Our results show that the enantioselectivity is dependent on the ozaxoline and the phosphinite moieties and the substrate structure. By carefully selecting the ligand components, enantioselectivities up to 99 % were
由容易获得的 (+)-D-葡糖胺制备的吡喃糖苷次膦酸酯-恶唑啉配体应用于 Ir 催化的最低官能化烯烃的不对称氢化。我们的结果表明,对映选择性取决于 ozaxoline 和次膦酸盐部分以及底物结构。通过仔细选择配体组分,在几种 (E)- 和 (Z)- 三取代和 1,1- 二取代烯烃的不对称还原中获得了高达 99% 的对映选择性。还使用碳酸亚丙酯作为溶剂进行不对称氢化,这使得铱催化剂可以重复使用并保持高对映选择性。