Copper(I)-Catalyzed Asymmetric 1,4-Conjugate Hydrophosphination of α,β-Unsaturated Amides
作者:Yan-Bo Li、Hu Tian、Liang Yin
DOI:10.1021/jacs.0c09654
日期:2020.11.25
hydrophosphination of α,β-unsaturated amides is accomplished by virtue of the strong nucleophilicity of copper(I)-PPh2 species, which provides an array of chiral phosphines bearing an amide moiety in high to excellent yields with excellent enantioselectivity. Furthermore, the dynamic kinetic resolution of unsymmetrical diarylphosphines (HPAr1Ar2) is successfully carried out through the copper(I)-catalyzed conjugate
α,β-不饱和酰胺的催化不对称共轭氢膦化反应是通过铜 (I)-PPh2 物质的强亲核性完成的,它提供了一系列带有酰胺部分的手性膦,收率高到极好,具有极好的对映选择性。此外,不对称二芳基膦(HPAr1Ar2)的动态动力学拆分是通过铜(I)催化的共轭加成与α,β-不饱和酰胺成功进行的,这提供了具有良好到高非对映选择性和高对映选择性的P-手性膦. 1H NMR 研究表明,HPPh2 与铜 (I)-双膦配合物的预配位对于巴顿碱的有效去质子化至关重要。此外,在过量 HPPh2 存在下,铜 (I)-(R,RP)-TANIAPHOS 络合物的相对稳定性,由 31P NMR 研究证实,对于高不对称诱导至关重要,因为双膦和 HPPh2 之间的配体交换会显着降低对映选择性。最后,双催化不对称共轭氢膦化反应以高产率提供相应产物,具有高非对映选择性和优异的对映选择性,并以中等产率转化为手性钳形钯配合物。这种手性钯