Hemilabile Diamidophosphite-Thioether Ligands with a β-Hydroxy Sulfide Backbone: Palladium(II) Complexes and Asymmetric Allylic Substitution
作者:Konstantin N. Gavrilov、Ilya V. Chuchelkin、Vladislav K. Gavrilov、Sergey V. Zheglov、Ilya D. Firsin、Valeria M. Trunina、Nataliya E. Borisova、Yan P. Bityak、Olga A. Maloshitskaya、Victor A. Tafeenko、Vladislav S. Zimarev、Nataliya S. Goulioukina
DOI:10.1021/acs.organomet.3c00212
日期:2023.8.14
Pd(II), these hemilabile ligands showed the ability to form both P,S-chelates and complexes with two ligands connected to the metal P-monodentately. The structures of the ligands and complexes were confirmed by two-dimensional (2D) NMR spectroscopy and single-crystal X-ray diffraction. These stereoselectors provided up to 98% ee in the Pd-catalyzed asymmetric allylic substitution of (E)-1,3-diphenylallyl
由1,2-硫醚醇合成了一系列结构多样的二酰氨基亚磷酸酯硫化物。对于 Pd(II),这些半不稳定配体表现出与单齿金属P-连接的两个配体形成P、S-螯合物和络合物的能力。配体和配合物的结构通过二维(2D)NMR 光谱和单晶 X 射线衍射证实。这些立体选择剂在 Pd 催化的 ( E )-1,3-二苯基烯丙基乙酸酯与 C-和 N-亲核试剂的不对称烯丙基取代中提供高达 98% ee,在 Pd 介导的乙酸肉桂酯的烯丙基烷基化中提供高达 78% ee与β-酮酯。此外,高达 71%ee是在 2-(二乙氧基磷酰基)-1-苯基烯丙基乙酸酯和苯胺之间的罕见反应中实现的。讨论了结构参数、反应条件和配体与金属的比例对催化结果的影响。由于配体能够形成结构不同的催化物质,因此显示出不对称诱导对配体与金属比率的显着依赖性。