Pyrrole and Pyrazole Ring Closure in Heterogeneous Media
作者:F. Texier-Boullet、B. Klein、J. Hamelin
DOI:10.1055/s-1986-31655
日期:——
Pyrroles and pyrazoles may be conveniently prepared by dispersing primary amines or hydrazines and 1,4- or 1,3-diketones, respectively, on alumina or clay (montmorillonite K 10) without solvent, keeping the mixture at 20°C or higher temperatures for 1-26 h, and then eluting the product with dichloromethane.
Al complexes bearing ketimine ligands was investigated. The catalytic results indicated complexes with more steric hindrance with an electron-withdrawing group on the ligands, or the fact that less chelating ligands demonstrated greater propagation activity. The opposite trend for these structural effects was observed on the measurement of induction periods. These features on ligands of aluminum complexes
Liquid-Assisted Mechanosynthesis of trans-2,3-Dihydropyrroles from Chalcones and Enaminones
作者:Hui Xu、Ze Zhang、Ming-Yue Weng、Hong Chen
DOI:10.3987/com-20-14365
日期:——
iodine-promoted cyclization between chalcones and enaminones has been demonstrated under liquid-assisted grinding conditions. The present protocol provides a practical, fast and green alternative to traditional solvent-based methods due to its notable advantages such as significantly higher yield, much shorter reaction time, good functional group tolerance and mild reaction conditions.
β‐Enaminone Synthesis from 1,3‐Dicarbonyl Compounds and Aliphatic and Aromatic Amines Catalyzed by Iron Complexes of Fused Bicyclic Imidazo[1,5‐
<i>a</i>
]pyridine Derived N‐Heterocyclic Carbenes
作者:A. P. Prakasham、Manoj Kumar Gangwar、Prasenjit Ghosh
DOI:10.1002/ejic.201800906
日期:2019.1.17
fused bicyclic imidazo[1,5‐a]pyridine framework of the type [CpFe(2‐R‐imidazo[1,5‐a]pyridin‐3‐ylidene)(CO)2]BF4 R = mesityl (1c), nPr (2c)} successfully carried out the synthesis of β‐enaminoketones (3–10) and (17–27) and β‐enamino esters (11–16) and (28–36) by the condensation of acyclic and cyclic 1,3‐dicarbonyl compounds and various aliphatic and aromatic amines in the presence of light irradiation
一系列的Fe-NHC络合物(1 - 2)ç稠合的双环咪唑并[1,5-的一个]吡啶的类型的框架[CpFe的量(2-R -咪唑并[1,5-一个]吡啶-3-亚基)(CO)2 ] BF 4 R =异亚丙基丙酮(1C),ñ PR(图2c)}成功地进行了β烯氨基酮(合成3 - 10)和(17 - 27)和β-烯酯(11 – 16)和(28 – 36)在光照射下通过无环和环状1,3-二羰基化合物与各种脂肪族和芳香族胺的缩合而形成。相当显著,类型[CpFe的量(NHC)(acac)]的(的催化相关衬底加合物种类2E)和式[CpFe的量(NHC)(β的乘积加合物种类-烯胺酮)](2F所述的Fe的)已通过质谱研究检测到NHC前催化剂(2c)。[CpFe(2-R-咪唑并[1,5- a ]吡啶-3-亚基)(CO)2 ] BF 4 R =均三(1c),n Pr(2c)}络合物是从它们各自的N-杂环卡宾前体,即2-R-咪唑并[1
Bimetallic Ag–Cu alloy nanoparticles as a highly active catalyst for the enamination of 1,3-dicarbonyl compounds
作者:Lipeeka Rout、Aniket Kumar、Rajendra S. Dhaka、Priyabrat Dash
DOI:10.1039/c6ra04569c
日期:——
Bimetallicnanoparticles, particularly those based on copper, have recently attracted a great deal of attention for the development of low cost and highlyactive catalysts due to the synergistic interaction between individual metal components. In this work, bimetallic Ag–Cu alloynanoparticles were explored as a highlyactive and reusable catalyst for the enamination of 1,3-dicarbonyls using diverse