Ag/CNT-catalyzed hydroamination of activated alkynes with aromatic amines
作者:Yi Liu、Guojie Wu、Yingde Cui
DOI:10.1002/aoc.2950
日期:2013.4
nanotubes (CNTs) provide a certain potential activation of catalysis in heterogeneous catalytic organicreactions. Herein, an efficient Ag/CNT‐catalyzed synthesis of enamines via hydroamination of activatedalkynes with aromatic amines has been described. This catalyst still retains catalytic activity after being recycled and reused three times. In addition, it represents a green and environmentally
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.
12-Tungstophosphoric acid (H3PW12O40) is found to be an efficient and recyclable catalyst in promoting a chemo- and regioselective condensation of hydrazines/hydrazides, diamines, and primary amines with various 1,3-dicarbonyl compounds in pure water at room temperature to afford pyrazoles, diazepines, and enaminones/enamino esters, respectively, in high yields.
Solvent-free synthesis of β-enamino ketones and esters catalysed by recyclable iron(III) triflate
作者:Cheng-Liang Feng、Ning-Ning Chu、Shu-Guang Zhang、Jin Cai、Jun-Qing Chen、Hua-You Hu、Min Ji
DOI:10.2478/s11696-014-0544-8
日期:2014.1.1
A novel application of highly stable Fe(OTf)3 as an efficient catalyst for the synthesis of a variety of β-enaminoketones and esters under solvent-free conditions is described. Notably, this protocol of a “green synthesis”, which produced β-enaminoketones and esters by the reaction of a variety of β-dicarbonyl compounds and primary amines, exhibits attractive properties including high yields, short
Room-Temperature Synthesis of Pyrazoles, Diazepines, <font>β</font>-Enaminones, and <font>β</font>-Enamino Esters Using Silica-Supported Sulfuric Acid as a Reusable Catalyst Under Solvent-Free Conditions
highly efficient regio- and chemoselective condensation of hydrazines/hydrazides, diamines, and primary amines with various β-dicarbonyl compounds at room temperature to afford pyrazoles, diazepines, and β-enaminones/β-enaminoesters under solvent-free conditions within 5–15 min.