CN键的形成被认为是非常有用且基本的反应,这对于有机化学和药物化学中含氮分子的合成非常重要。贵金属和均相催化剂经常被用于形成CN键,但是,这些催化剂仍然存在一些问题,例如成本高,污染严重和原子经济性低。在此将低毒且便宜的铁络合物负载在CNT上,并制备了名为Fe-N x / CNTs的异质单原子催化剂(SAC)。我们首次将这种SAC应用于CN键的合成。发现Fe-N x / CNTs是从芳族胺和酮合成CN键的有效催化剂。催化性能非常出色,产率高达96%,比贵金属催化剂(例如AuCl 3 / CNT和RhCl 3 / CNT)高6倍。它适用于多达13种不含添加剂的芳族胺底物,并获得17种烯胺酮。通过将高角度环形暗场扫描透射电子显微镜(HAADF-STEM)与X射线吸收光谱法(XAS)结合使用,我们观察到Fe-N x / CNTs的铁物种分散良好,因为单原子和Fe- N x可能是催化活性位点。该Fe-N
An efficient copper-catalyzed formation of highly substituted pyrazoles using molecular oxygen as the oxidant
作者:Mamta Suri、Thierry Jousseaume、Julia J. Neumann、Frank Glorius
DOI:10.1039/c2gc35476d
日期:——
An efficient Cu-catalyzed formation of tetra-substituted pyrazoles is reported. In this atom economic process, readily available enamines and nitriles are reacted by C–C and N–N bond formation. Oxygen has been successfully used as the oxidant, which has important economic and environmental advantages. A broad scope of enamines and nitriles can be utilized in this process.
Approach to Synthesis of β-Enamino Ketones and Pyrroles Catalyzed by Gallium(III) Triflate Under Solvent-Free Conditions
作者:Jiuxi Chen、Xiaoliang Yang、Miaochang Liu、Huayue Wu、Jinchang Ding、Weike Su
DOI:10.1080/00397910902898528
日期:2009.11.5
Abstract Metal triflates have been used to catalyzesynthesis of β-enamino ketones or pyrroles from amines and 1,3-dicarbonyl or 1,4-dicarbonyl compounds undersolvent-freeconditions, respectively. Among different metal triflates screened, 0.5 mol% Ga(OTf)3 efficiently promoted the reactions to give excellent yields. In addition, the catalyst could be recovered easily after the reactions and reused
A General and Efficient Method for the Preparation of β-Enamino Ketones and Esters Catalyzed by Indium Tribromide
作者:Zhan-Hui Zhang、Liang Yin、Yong-Mei Wang
DOI:10.1002/adsc.200505268
日期:2006.1
A variety of β-enaminoketones and esters have been synthesized in high to exellent yields by reacting β-dicarbonyl compounds with amines in the presence of a catalytic amount of indiumtribromide. The reaction proceeds smoothly at room temperature in a short reaction time under solvent-free conditions.
A novel enamination of β-dicarbonyl compounds catalyzed by Bi(TFA)<sub>3</sub> immobilized on molten TBAB
作者:Mohammad M Khodaei、Ahmad R Khosropour、Mehdi Kookhazadeh
DOI:10.1139/v05-021
日期:2005.3.1
Enamination of a wide variety of primary amines was successfully carried out in the presence of catalytic amounts of bismuth(III) trifluoroacetate immobilized on molten tetrabutylammonium bromide as "green" media under mild conditions. This new system of the catalyst is recyclable and reusable. Generally, the results of the reaction in tetrabutylammonium bromide is better than the previously obtained
Zn(ClO 4 ) 2 .6H 2 O proved to be a very powerfulcatalyst for the condensation of primary and secondary amines with β-ketoesters to give N-substituted β-enaminoesters.