A new type of supramolecular chiral dendritic monophosphite ligands has been prepared via a hydrogen-bonding assembly. The Rh complexes of these supramolecular ligands have been successfully applied in the asymmetric hydrogenation of enamides and dehydroamino acid derivatives with good enantioselectivities, which are comparable to those obtained from the free monophosphite ligands. The supramolecular catalyst could be easily recycled viasolvent precipitation.
通过氢键组装,制备了一类新型超分子手性树枝状单
膦配体。这些超分子
配体的
铑配合物已成功应用于烯酰胺和脱氢
氨基酸衍
生物的不对称氢化反应,具有良好的对映选择性,与自由单
膦配体获得的结果相当。超分子催化剂可通过溶剂沉淀轻松回收。