Enantioselective Michael Addition of Malononitrile to Unsaturated Ketones Catalyzed by Rare-Earth Metal Amides RE[N(SiMe<sub>3</sub>)<sub>2</sub>]<sub>3</sub> with Phenoxy-Functionalized TsDPEN Ligands
作者:Yingying Ren、Qishun Yu、Chengrong Lu、Bei Zhao
DOI:10.1021/acs.joc.3c01435
日期:2023.9.15
The catalytic enantioselective Michael addition of α,β-unsaturated ketones with malononitrile was well established using rare-earth metal amides RE[N(SiMe3)2]3 (RE = Y, Eu, Sm, Nd, La) with chiral phenoxy-functionalized TsDPEN ligands. The combination of lanthanum amide La[N(SiMe3)2]3 and chiral TsDPEN ligand H3L1 [H3L1 = N-((1R,2R)-2-((3,5-di-tert-butyl-2-hydroxybenzyl)amino)-1,2-diphenylethyl)-4
使用稀土金属酰胺 RE[N(SiMe 3 ) 2 ] 3 (RE = Y, Eu, Sm, Nd, La) 和手性苯氧基,很好地建立了 α,β-不饱和酮与丙二腈的催化对映选择性迈克尔加成反应。功能化的 TsDPEN 配体。酰胺镧 La[N(SiMe 3 ) 2 ] 3与手性 TsDPEN 配体 H 3 L 1 [H 3 L 1 = N -((1 R ,2 R )-2-((3,5-di-)叔丁基-2-羟基苄基)氨基)-1,2-二苯基乙基)-4-甲基苯磺酰胺]以1:1.5的摩尔比被证明是THF的最佳配合物,它以优异的产率提供了所需的β-羰基二腈-15 °C 12 小时后具有良好至高的对映选择性。