Ionic Liquid as Catalyst and Reaction Medium. The Dramatic Influence of a Task-Specific Ionic Liquid, [bmIm]OH, in Michael Addition of Active Methylene Compounds to Conjugated Ketones, Carboxylic Esters, and Nitriles
作者:Brindaban C. Ranu、Subhash Banerjee
DOI:10.1021/ol051004h
日期:2005.7.1
[reaction: see text] A task-specific ionicliquid, [bmIm]OH, has been introduced as a catalyst and as a reactionmedium in Michael addition. Very interestingly, although the addition to alpha,beta-unsaturated ketones proceeds in the usual way, giving the monoaddition products, this ionicliquid always drives the reaction of open-chain 1,3-dicarbonyl compounds with alpha,beta-unsaturated esters and
Ionic liquid as catalyst and solvent: the remarkable effect of a basic ionic liquid, [bmIm]OH on Michael addition and alkylation of active methylene compounds
作者:Brindaban C. Ranu、Subhash Banerjee、Ranjan Jana
DOI:10.1016/j.tet.2006.10.077
日期:2007.1
ketones, carboxylic esters and nitriles. It further catalyzes the addition of thiols to α,β-acetylenic ketones and alkylation of 1,3-dicarbonyl and -dicyano compounds. The Michael addition to α,β-unsaturated ketones proceeds in the usual way, giving the monoaddition products, whereas addition to α,β-unsaturated esters and nitriles leads exclusively to the bis-addition products. The α,β-acetylenic ketones
Intramolecular and intermolecular ketone–ester reductive coupling reactions promoted by samarium(II) iodide
作者:Yunkui Liu、Yongmin Zhang
DOI:10.1016/s0040-4039(01)01107-8
日期:2001.8
Intramolecular and intermolecular ketone–ester reductivecouplingreactionspromoted by SmI2 have been studied. Substituted 2-hydroxy-5-ethoxycarbonylcyclopentanones, 5-ethoxycarbonylcyclopentenones and α-ketols were prepared in moderate to good yields at room temperature or under reflux under neutral conditions.
Michael Addition Catalyzed by Potassium Hydroxide Under Ultrasound
作者:Ji-Tai Li、Yong Cui、Guo-Feng Chen、Zhao-Li Cheng、Tong-Shuang Li
DOI:10.1081/scc-120015762
日期:2003.1.3
Abstract Michael addition of chalcone with active methylene compound such as diethyl malonate, nitromethane and ethyl acetoacetate catalyzed by potassiumhydroxide in anhydrous ethanol results Michael adducts in 75–98% yield under ultrasound irradiation in 25–90 min.
The Michael Addition of Active Methylene Compounds to Chalcone Derivatives using a Catalytic Amount of Iodine and K<sub>2</sub>CO<sub>3</sub> at Room Temperature
作者:Yi-Ming Ren、Chun Cai
DOI:10.3184/174751911x12984726527461
日期:2011.3
A convenient method for the Michael addition of activemethylenecompounds to chalcone derivatives has been developed using the inexpensive and environmentally friendly reagent I2/K2CO3 at room temperature. The method is mild and proceeds with good to high yields.