Synthesis and Structural Characterization of Nickel Complexes Possessing P-Stereogenic Pincer Scaffolds and Their Application in Asymmetric Aza-Michael Reactions
作者:Zehua Yang、Delong Liu、Yangang Liu、Masashi Sugiya、Tsuneo Imamoto、Wanbin Zhang
DOI:10.1021/om501287k
日期:2015.4.13
Notably, the PCP complex 3 exhibited higher catalytic activity in the aza-Michael addition than the PNP complexes 7, 8, and 9. Two achiral PCP-type pincer-Ni complexes, κP,κC,κP-3,5-Me2-2,6-(tBu2PCH2)2C6H}NiCl (11) and κP,κC,κP-3,5-Me2-2,6-(Ph2PCH2)2C6H}NiCl (13), were also synthesized and fully characterized in order to reveal the structural differences between the chiral and achiral complexes.
新颖P-立体钳形络合物的Ni κ P,κ Ç,κ P -3,5--ME 2 -2,6-(ME吨BuPCH 2)2 C ^ 6 H}的NiCl(3),κ P,κ ç,κ P -3,5--ME 2 -2,6-(ME吨BuPCH 2)2 C ^ 6 H} NiOTf(4),[κ P,κ ñ,κ P -2,6-(ME吨BuPCH 2)2 C 5 H 3N}的NiCl]氯(7),[κ P,κ Ñ,κ P -2,6-(ME吨BuPCH 2)2 C ^ 5 ħ 3 N}的NiCl] BF 4(8),和[κ P,κ ñ,κ P -2,6-(ME吨BuPCH 2)2 C ^ 5 ħ 3 N}的Ni(NCMe)](BF 4)2(9)在55-84%的产率被合成和表征通过1个ħ NMR,13 C 1 H} NMR,31 P 1 H} NMR,19 F 1 H} NMR和/或单晶X射线衍射。复