reducing alkenes bearing metal-coordinating groups. In the present system, selectivity was pressure-dependent: In most cases, a decrease in the H2 pressure to 3 bar resulted in an increase in enantioselectivity. Moreover, the process can be carried out in environmentally friendly solvents, such as methanol and ethyl acetate, with no loss of selectivity.
MaxPHOX-Ir 催化剂系统为 α-和
β-四氢萘酮衍生的环状烯酰胺的还原提供了迄今为止报道的最高选择性。该结果表明
铱催化剂也能有效还原带有
金属配位基团的烯烃。在本系统中,选择性取决于压力:在大多数情况下,
氢气压力降低至 3 bar 会导致对映选择性增加。此外,该过程可以在
甲醇和
乙酸乙酯等环保溶剂中进行,而不会损失选择性。