Synthesis, characterization and catalytic activity of rare-earth metal amides incorporating cyclohexyl bridged bis(β-diketiminato) ligands
作者:Hui Miao、Shaowu Wang、Xiancui Zhu、Shuangliu Zhou、Yun Wei、Qingbing Yuan、Xiaolong Mu
DOI:10.1039/c7ra07565k
日期:——
characterized by 1H NMR and 13C NMR spectral analyses. The structures of complexes 1a–d were determined by single-crystal X-ray analyses. Investigation of the catalytic properties of the complexes indicated that all complexes exhibited a high catalytic activity towards the addition of diphenylphosphine oxide to β-nitroalkene and α,β-unsaturated carbonylderivatives with an excellent regioselectivity
一系列有机稀土金属酰胺,它们掺入具有手性的环己基桥联的双(β-二酮亚胺基)配体,通式为L REN(SiMe 3)2(L 1 =(1 S,2 S)-1,2-Cy [NC( Me)CHC(Me)NAr] 2,Ar = 2,6-Et 2 C 6 H 3,RE = Nd(1a),Dy(1b),Yb(1c),Y(1d); L 2 =(1 R,2 R)-1,2-Cy [NC(Me)CHC(Me)NAr] 2,Ar = 2,6- i -Pr 2 C通过[(Me 3 Si) 2 N] 3 RE的反应以高收率合成了6 H 3,RE = Nd( 2a),Gd( 2b),Dy( 2c),Er( 2d),Y( 2e))。具有H 2 L 1和H 2 L 2的III(μ-Cl)Li(THF) 3。所有化合物均通过光谱法和元素分析充分表征。配合物1d和2e的特征还在于1 H NMR和131 H NMR光谱分析。配合物1
Zn(OTf)<sub>2</sub>-Catalyzed Phosphinylation of Propargylic Alcohols: Access to γ-Ketophosphine Oxides
first facile and efficient Zn(OTf)2-catalyzed direct coupling of unprotected propargylic alcohols with arylphosphine oxides has been developed, affording a general, one-step approach to access structurally diverse γ-ketophosphine oxides via sequential Meyer–Schuster rearrangement/phospha-Michael reaction along with new C(sp3)—P and C═Obondformations, operational simplicity, and complete atom economy
Three-Component Direct Phosphorylation of Aldehydes and Alkylation of Ketones: Synthesis of γ-Ketophosphine Oxides under Acidic Conditions
作者:Xiao-Hong Wang、Ya-Wen Xue、Chun-Yuan Bai、Yan-Bin Wang、Xiao-Hong Wei、Qiong Su
DOI:10.1021/acs.joc.3c01674
日期:2023.12.1
and C–C bonds for the synthesis of γ-ketophosphine oxides with water as the only byproduct was developed. Detailed mechanistic experiments confirmed that the reaction proceeds by phospha-aldol elimination, in which a benzylic carbocation is generated from the phosphorylation of aldehydes, which then reacts with ketone enolates underacidicconditions.