An efficient method for <i>retro</i>-Claisen-type C–C bond cleavage of diketones with tropylium catalyst
作者:M. A. Hussein、V. T. Huynh、R. Hommelsheim、R. M. Koenigs、T. V. Nguyen
DOI:10.1039/c8cc07329e
日期:——
cleavage in this reaction is usually promoted by a number of transition-metal Lewis acid catalysts or organic Brønsted acids/bases. Herein we report a new convenient and efficient method utilizing the tropylium ion as a mild and environmentally friendly organocatalyst to mediate retro-Claisen-type reactions. Using this method, a range of synthetically valuable substances can be accessed via solvolysis of
Expeditious and eco-friendly synthesis of new multifunctionalized pyrrole derivatives and evaluation of their antioxidant property
作者:Tania Kundu、Animesh Pramanik
DOI:10.1016/j.bioorg.2020.103734
日期:2020.5
upon the efficient and eco-friendly synthesis of an array of novel diversely functionalized pyrrolederivatives which are found to be antioxidants with reactive oxygen species (ROS) shielding competency against the deleterious consequence of oxidative stress. The results of the investigation displayed the effect of structural modification of the pyrrolederivatives on their respective antioxidant properties
A general and efficient method for synthesis of enaminones and enamino esters catalyzed by NbCl5 under solvent-free conditions
作者:Yu-Heng Liu、Ping Wang、Gui-Tian Cheng
DOI:10.1007/s00706-012-0783-8
日期:2013.2
synthesis of β-enaminones and β-enamino esters by reacting 1,3-dicarbonyl compounds with amines in the presence of catalytic amounts of niobium pentachloride. The reaction proceeds smoothly at room temperature under solvent-free conditions and leads to chemo- and regioselective formation of enamine derivatives in high to excellent yields. Graphical Abstract
Mild and Efficient Method for Synthesis of Eaminones Using Ytterbium Triflate as Catalyst
作者:Rener Chen、Ping Li、Jianjun Li、Weike Su
DOI:10.1080/00397911.2010.493722
日期:2010.8.5
A mild and efficient procedure for synthesis of β-enaminones by the condensation of β-dicarbonyl compounds and amines using ytterbium triflate [Yb(OTf)3] as catalyst is described. The catalyst can be easily recovered and reused without loss of activity.
FeCl<sub>3</sub>-Catalyzed Combinatorial Synthesis of Functionalized Spiro[Indolo-3,10′-indeno [1,2-<i>b</i>]quinolin]-trione Derivatives
作者:Animesh Mondal、Chhanda Mukhopadhyay
DOI:10.1021/acscombsci.5b00038
日期:2015.7.13
new spiro[indolo-3,10′-indeno [1,2-b]quinolin]-trione derivatives has been developed, involving three-component reaction of enaminones, N-substituted isatins and Indane-1,3-dione catalyzed by FeCl3. The approach to this spiro-heterocycle is noteworthy because it results in the formation of three new σ (two C–C and one C–N) bonds in a single operation, leading to the construction of novel spiro skeleton
已开发出一种高效,廉价,环保且高收率的锅法合成新的螺[indolo-3,10'-茚并[1,2- b ]喹啉]-三酮衍生物,涉及烯胺酮的三组分反应, FeCl 3催化N-取代的isatins和Indane-1,3-dione 。值得注意的是,这种螺旋杂环的方法会导致在一次操作中形成三个新的σ键(两个C–C和一个C–N),从而构造出新颖的螺旋骨架。该方法以优异的产量大规模工作。