Eco-friendly polyethylene glycol promoted Michael addition reactions of α,β-unsaturated carbonyl compounds
作者:Dalip Kumar、Gautam Patel、Braja G. Mishra、Rajender S. Varma
DOI:10.1016/j.tetlet.2008.09.116
日期:2008.12
Intra- and inter-nucleophilic addition reactions of different α,β-unsaturatedcarbonylcompounds were found to be highly effective without any additives in PEG-400 as a recyclable reaction medium under neutral conditions.
Alumina supported-CeCl3·7H2O–NaI: an efficient catalyst for the cyclization of 2′-aminochalcones to the corresponding 2-aryl-2,3-dihydroquinolin-4(1H)-ones under solvent free conditions
作者:Naseem Ahmed、Johan E. van Lier
DOI:10.1016/j.tetlet.2006.11.020
日期:2007.1
supported-TaBr5 as an efficientcatalyst for the isomerization of 2′-aminochalcones to the corresponding 2-aryl-2,3-dihydroquinolin-4(1H)-ones under solventfreeconditions (Tetrahedron Lett. 2006, 47, 2725–2729). This conversion can be further improved through the use of more economic alumina supported-CeCl3·7H2O–NaI, providing high yields of up to 98% at lower reaction temperatures. This stable catalyst is easily
Silica gel supported TaBr5: new catalyst for the facile and rapid cyclization of 2′-aminochalcones to the corresponding 2-aryl-2,3-dihydroquinolin-4(1H)-ones under solvent-free conditions
作者:Naseem Ahmed、Johan E. van Lier
DOI:10.1016/j.tetlet.2006.02.086
日期:2006.4
Silica gel supported TaBr5 (5-10 mol %) is anew solid-support catalyst that can be used under solvent-free conditions for the facile and efficient isomerization of 2'-aminochalcones to the corresponding 2-aryl-2,3-dihydroquinolin-4(1H)-ones. The catalyst is easily prepared, stable and employed under environmentally friendly conditions. (c) 2006 Elsevier Ltd. All rights reserved.
Ionic liquid catalyzed expeditious synthesis of 2-aryl-2,3-dihydroquinolin-4(1<i>H</i>)-ones and 2-aryl-2,3-dihydro-4<i>H</i>-chromen-4-ones under microwave irradiation
作者:Dalip Kumar、Gautam Patel、Anil Kumar、Ram K. Roy
DOI:10.1002/jhet.123
日期:2009.7
A facile and convenient synthesis of 2-aryl-2,3-dihydroquinolin-4(1H)-one and 2-aryl-2,3-dihydro-4H-chromen-4-one has been described using ionicliquidcatalyzed intramolecular cyclization of the corresponding 2′-aminochalcones and 2′-hydroxychalcones, respectively. The rapid and fairly general protocol affords product in good yield. Ionicliquid, 1-butyl-3-methylimidazolium tetrafluoroborate, was