Application of Supramolecular Bidentate Hybrid Ligands in Asymmetric Hydroformylation
作者:Rosalba Bellini、Joost N. H. Reek
DOI:10.1002/chem.201202044
日期:2012.10.15
which the phosphane ligand is in the axial position and the phosphoramidite adopts the equatorial position. These ligands were applied in the asymmetric Rh‐catalysed hydroformylation of styrene and para‐substituted analogues. In these hydroformylation reactions, modification of the electronic and steric properties of the zinc(II)‐templates appear to have a significant influence on the activity and
Supramolecular Hybrid Bidentate Ligands in Asymmetric Hydrogenation
作者:Rosalba Bellini、Joost N. H. Reek
DOI:10.1002/ejic.201200549
日期:2012.10
the Rh-catalysed asymmetric hydrogenation of α-dehydroamino acid esters and Roche ester derivatives. High activities and good to excellent enantioselectivities up to 99 % ee were obtained with the supramolecular ligands. Application of the supramolecular strategy on the basis of variations of the steric and electronic properties of zinc(II) templates demonstrate that these changes can influence key reaction
在这项研究中,我们介绍了一类新的超分子双齿杂化配体及其在铑催化前手性烯烃不对称氢化中的应用。报道了一种新的超分子策略,其中两个不等价的磷原子共价连接到手性支架上,超分子相互作用用于控制过渡金属催化剂的第二配位球。超分子组装是通过氮供体原子和锌 (II) 模板之间的选择性相互作用原位形成的,这对于获得高活性和选择性至关重要。对不同的锌 (II) 和钌 (II) 模板对反应参数的研究揭示了超分子模板和吡啶基配体之间的缔合常数的活性和选择性的依赖性。在 α-脱氢氨基酸酯和罗氏酯衍生物的 Rh 催化不对称氢化中探索了超分子组装的范围。使用超分子配体获得了高活性和良好的对映选择性,高达 99% ee。基于锌(II)模板的空间和电子特性变化的超分子策略的应用表明,这些变化会影响关键反应参数,如活性和选择性 在 α-脱氢氨基酸酯和罗氏酯衍生物的 Rh 催化不对称氢化中探索了超分子组装的范围。使用超分子配体获得了高活性和良好的对映选择性,高达