Enantioselective Hydroboration of Ketones Catalyzed by Rare-Earth Metal Complexes Containing Trost Ligands
作者:Yuli Sun、Chengrong Lu、Bei Zhao、Mingqiang Xue
DOI:10.1021/acs.joc.0c00877
日期:2020.8.21
dinuclear rare-earth metal complexes [REL1]2 (RE = Y(1), Eu(2), Nd(3), La (4)) stabilized by Trost proligand H3L1 (H3L1 = (S,S)-2,6-bis[2-(hydroxydiphenylmethyl)pyrrolidin-1-ylmethyl]-4-methylphenol) were first prepared, and all were characterized by X-ray diffraction. Complex 4 was employed as the catalyst for enantioselective hydroboration reaction of substituted ketones, and the corresponding secondary
四个手性双核稀土金属络合物[REL 1 ] 2(RE = Y(1),Eu(2),Nd(3),La(4))由Trost proligand H 3 L 1(H 3 L 1 =首先制备(S,S)-2,6-双[2-(羟基二苯基甲基)吡咯烷-1-基甲基] -4-甲基苯酚,并通过X射线衍射对其进行表征。复杂4将其用作取代酮的对映选择性硼氢化反应的催化剂,使用还原剂HBpin可制得具有优异收率和较高ee值的相应仲醇。同样的结果,使用镧酰胺的La [N(森的组合也实现3)2 ] 3与特罗斯特前配体ħ 3大号1 1的摩尔比:在一个1。实验结果和DFT计算揭示了对映选择性硼氢化反应的可能机理,并确定了当前系统中对映选择性的起源。