Chiral phosphine ligand libraries based on the Bull–James three-component supramolecular assembly
作者:Hsin Y. Su、Daniel Gorelik、Mark S. Taylor
DOI:10.1080/10610278.2018.1564829
日期:2019.3.4
each component was observed. 11B NMR spectroscopy was used to evaluate the existence of B–N interactions in the free ligands as well as their Pd-derived complexes. A bidentate P,N-coordination mode was inferred for ligands that gave high enantioselectivity in the allylic substitution reaction. Abbreviation: BINOL: 1,1'-bi-2-naphthol; BSA: N,O-bis(trimethylsilyl)acetamide; DIOP: (2,3-O-isopropylidene-2
摘要描述了一种合成手性膦配体文库的方法,使用 2-甲酰基芳基硼酸、二醇或相关化合物和氨基膦的缩合。这种冷凝的三组分性质,以及构建块的现成可用性,能够快速生成不同的结构。从亚氨基硼酸酯衍生的膦库中,鉴定了在基准钯催化的烯丙基取代反应中产生 90% ee 或更高的三种配体。观察到作为每个组分结构函数的选择性的显着变化。11B NMR 光谱用于评估游离配体及其 Pd 衍生配合物中 B-N 相互作用的存在。双齿 P,对于在烯丙基取代反应中提供高对映选择性的配体,推断出 N 配位模式。缩写:BINOL:1,1'-bi-2-萘酚;BSA:N,O-双(三甲基甲硅烷基)乙酰胺;DIOP:(2,3-O-isopropidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane;HPLC:高效液相色谱;NMR:核磁共振;THF:四氢呋喃