Highly efficient and facile synthesis of β-enaminones catalyzed by diphenylammonium triflate
作者:Ting-Ting Zhao、Jiang-Long Song、Feng-Qing Hong、Jian-Sheng Xia、Jian-Jun Li
DOI:10.1007/s11696-019-00838-2
日期:2019.11
The catalytic performance of diphenylammonium triflates as an organocatalyst in the synthesis of β-enaminones from various substituted β-diketones and amides (or amines) were evaluated. A wide range of β-enaminones were efficiently synthesized in good to excellent yields under mild reaction conditions. Applying diphenylammonium triflate (DPAT) as catalyst makes this protocol cost-effective, low corrosive and easy to handle.
Efficient Synthetic Method for β-Enamino Esters Catalyzed by Yb(OTf)3 under Solvent-Free Conditions
作者:Ravi Varala、Sreelatha Nuvula、Srinivas R. Adapa
DOI:10.1071/ch06239
日期:——
esters have been synthesized in moderate to excellent yields by reacting 1,3-dicarbonyl compounds with amines in the presence of catalytic amounts of Yb(OTf)3 (2 mol%). The reaction proceeds smoothly at ambient temperature undersolvent-freeconditions. The catalyst can be recovered 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 Reusable CNT‐Supported Single‐Atom Iron Catalyst for the Highly Efficient Synthesis of C−N Bonds
作者:Qifeng Ding、Yang Yu、Fei Huang、Lihui Zhang、Jian‐Guo Zheng、Mingjie Xu、Jonathan B. Baell、He Huang
DOI:10.1002/chem.201905468
日期:2020.4.6
reaction, which is important for the synthesis of nitrogen-containing molecules in both organic and pharmaceutical chemistry. Noble metal and homogeneous catalysts have been used for C-N bond formation frequently, however, there are still some problems for these catalysts such as high cost, serious pollution and low atom economy. Herein the low-toxic and cheaper ironcomplex was loaded on CNTs and the heterogenous
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
Zinc Triflate Catalysed Synthesis of β-Enamino Ketones(Esters) under Solvent-Free Conditions
作者:Chengliang Feng、Shuguang Zhang、Jin Cai、Junqing Chen、Huayou Hu、Min Ji
DOI:10.3184/174751913x13787959859506
日期:2013.10
An efficient and mild procedure is described for the synthesis of a series of β-enaminoketones(esters) from 1,3-dicarbonyl compounds and aliphatic and aromatic amines using zinc triflate as the catalyst.