Constructing a Quantitative Correlation between N-Substituent Sizes of Chiral Ligands and Enantioselectivities in Asymmetric Addition Reactions of Diethylzinc with Benzaldehyde
摘要:
Using the asymmetric addition reaction of diethylzinc with benzylaldehyde as a model, we have demonstrated that excellent correlations exist between steric reference parameters (Charton and Sterimol values) for appropriate sets of substituents present on chiral 1,2-aminophosphoramide ligands and the enantiomeric ratios of alcohol products produced in this process.
Synergistic effect of achiral quaternary ammonium salt on asymmetric additions of diethylzinc to aldehydes
摘要:
Our investigation has shown that achiral quaternary ammonium salt has a significant synergistic effect on the asymmetric additions of diethylzinc to aldehydes catalyzed by chiral phosphoramide-Zn(II) complex. The addition of 10 mol % NBu4X can dramatically reduce the loading amount of chiral ligand without sacrificing the excellent reactivity and enantioselectivity of the asymmetric reaction. (c) 2013 Elsevier Ltd. All rights reserved.
Constructing a Quantitative Correlation between N-Substituent Sizes of Chiral Ligands and Enantioselectivities in Asymmetric Addition Reactions of Diethylzinc with Benzaldehyde
作者:Huayin Huang、Hua Zong、Guangling Bian、Ling Song
DOI:10.1021/jo3016715
日期:2012.11.16
Using the asymmetric addition reaction of diethylzinc with benzylaldehyde as a model, we have demonstrated that excellent correlations exist between steric reference parameters (Charton and Sterimol values) for appropriate sets of substituents present on chiral 1,2-aminophosphoramide ligands and the enantiomeric ratios of alcohol products produced in this process.