Tellurium(IV) tetrachloride catalysed facile knoevenagel reaction
作者:Rahat H. Khan、Raj K. Mathur、Anil C. Ghosh
DOI:10.1080/00397919608086741
日期:1996.2
Abstract Non-enolisable aldehydes (I) and active methylene compounds (II) react in the presence of tellurium(IV) tetrachloride (catalytic) to give the corresponding α, β-unsaturated carbonyl compounds (III) in excellent yields and high purity.
摘要 不可烯醇化的醛 (I) 和活性亚甲基化合物 (II) 在四氯化碲 (IV)(催化)存在下反应,以优异的收率和高纯度反应生成相应的 α, β-不饱和羰基化合物 (III)。
Oxidative Olefination of Benzylamine with an Active Methylene Compound Mediated by Hypervalent Iodine (III)
作者:Bapurao D. Rupanawar、Sruthi M. Veetil、Gurunath Suryavanshi
DOI:10.1002/ejoc.201900970
日期:2019.9.30
Hypervalent iodine mediates the oxidative olefination of amines with activemethylenecompounds for the formation of electrophilic alkenes under mild reaction conditions in good to excellent yields.
高价碘介导胺与活性亚甲基化合物的氧化烯化反应,可在温和的反应条件下以良好至极好的收率形成亲电烯烃。
Triflic acid-catalyzed metal-free synthesis of (<i>E</i>)-2-cyanoacrylamides and 3-substituted azetidine-2,4-diones
作者:Bapurao D. Rupanwar、Santosh S. Chavan、Anil M. Shelke、Gurunath M. Suryavanshi
DOI:10.1039/c7nj05169g
日期:——
efficient synthesis of biologically active (E)-2-cyanoacrylamides and 3-substituted azetidine-2,4-diones has been reported with 64–94% yields under metal-free conditions. The reaction proceeds through sequential Knoevenagel condensation/stereoselective in situ monohydration of nitrile or C–N cyclization protocol in one-pot. The attractive features of this tandem process are moderate reaction conditions
Organic Reactions in Ionic Liquids: Ionic Liquids Ethylammonium Nitrate Promoted Knoevenagel Condensation of Aromatic Aldehydes with Active Methylene Compounds
作者:Yi Hu、Jue Chen、Zhang‐Gao Le、Qin‐Guo Zheng
DOI:10.1081/scc-200050380
日期:2005.3.1
Abstract The Knoevenagel condensation of aromaticaldehydes with activemethylenecompounds proceeded efficiently in a reusable ionic liquid, ethylammonium nitrate, at room temperature in the absence of any catalyst with high yields.
Knoevenagel condensation of aromatic aldehydes with active methylene compounds such as malononitrile, ethylcyanoacetate, and cyanoacetamide proceeded very smoothly in reusable and cheap ionic liquid 2-hydroxyethylammonium formate at room temperature in the absence of a catalyst. Compared to other reported ionic liquids, the ionic liquid 2-hydroxyethylammonium formate shows better potential in the applications on the industrial scale with its low cost and viscosity.