Copper(I)-imine complexes: Synthesis and catalytic activity in olefin cyclopropanation
摘要:
Different imine-type ligands, prepared by the condensation of anilines or of alpha-methylbenzylamine with 2-pyridinecarboxaldehyde (pyim(1,2)) or 2-quinolinecarboxaldehyde (quim(1,2)) were prepared. These species act as N,N'-bidentate, chelating ligands upon coordination to Cu(I): treatment of [Cu(PPh3)(3)Cl] with an equimolar amount of the ligands resulted in the displacement of two molecules of PPh3, giving rise to the formation of [Cu(pyim(1,2))(PPh3)Cl] (1-2) and [Cu(quim(1,2))(PPh3)Cl] (3-4), respectively. The copper derivatives 1-4 proved to be highly active catalysts in olefin cyclopropanation in the presence of ethyl diazoacetate, even using deactivated olefins (namely, 2-cyclohexen-1-one) as substrate. The X-ray structure of complex 2, [Cu(pyim(2))(PPh3)Cl], is also reported. (C) 2009 Elsevier B.V. All rights reserved.
已经合成了一系列具有席夫碱配体的N , N配位镍 (II) 配合物。所有N , N配位镍 (II) 配合物1 – 4都通过 IR 和元素分析进行了很好的表征。配合物1的分子结构通过单晶X射线衍射分析进一步表征。所有对空气和水分稳定的镍配合物对多种酰胺和伯醇的酰胺化反应均显示出有效的催化活性。N-烷基化酰胺以良好至优异的收率得到,释放水作为唯一的副产物。多种类型的官能团在这种反应条件下耐受良好。此外,还进行了对照实验以了解这种镍催化方案。
Brønsted Acid Catalyzed Benzylic C–H Bond Functionalization of Azaarenes: Nucleophilic Addition to Nitroso Compounds
作者:Xu Gao、Feng Zhang、Guojun Deng、Luo Yang
DOI:10.1021/ol501422k
日期:2014.7.18
A practical Brønsted acid promoted benzylicC–Hfunctionalization of 2-alkylazaarenes and nucleophilic addition to nitroso compounds was developed under mild conditions. Switched by Brønsted acids, this method can afford azaarene-2-aldimines, azaarene-2-carbaldehyde, or azaarene-2-oximes selectively. No metal, base, oxidant, or other additives were required.