Phosphane-Catalyzed Knoevenagel Condensation: A Facile Synthesis ofα-Cyanoacrylates andα-Cyanoacrylonitriles
作者:Jhillu S. Yadav、Basi V. Subba Reddy、Ashok K. Basak、Boddapati Visali、Akkirala Venkat Narsaiah、Kommu Nagaiah
DOI:10.1002/ejoc.200300513
日期:2004.2
Triphenylphosphane (TPP) has been utilized as a novel and efficient catalyst for the Knoevenagelcondensation of aldehydes with acidic methylene compounds such as ethyl cyanoacetate and malononitrile to afford substituted olefins. The reaction proceeds smoothly under mild and solvent-free conditions and the products are obtained in excellent yields with an E-geometry. This method is applicable for
An Eco‐Friendly Synthesis of Electrophilic Alkenes Catalyzed by Dimethylaminopyridine Under Solvent‐Free Conditions
作者:A. Venkat Narsaiah、A. K. Basak、B. Visali、K. Nagaiah
DOI:10.1081/scc-200026625
日期:2004.1.1
Electrophilic olefins were synthesized in solvent‐free condition using DMAP (10%mol) as catalyst in excellent yield and E‐geometry. The various aldehydes which are aliphatic, aromatic, and heterocyclics underwent smoothly for Knoevenagel condensation with different active methylene compounds. #IICT Communication No. 030900.
亲电烯烃是在无溶剂条件下使用 DMAP (10% mol) 作为催化剂以优异的产率和 E 几何合成的。脂肪族、芳香族和杂环的各种醛与不同的活性亚甲基化合物顺利进行Knoevenagel缩合。#IICT 通讯编号 030900。
Tri-lacunary polyoxometalates of Na8H[PW9O34] as heterogeneous Lewis base catalysts for Knoevenagel condensation, cyanosilylation and the synthesis of benzoxazole derivatives
作者:Shen Zhao、Yang Chen、Yu-Fei Song
DOI:10.1016/j.apcata.2014.01.017
日期:2014.4
development of tri-lacunary polyoxometalates (POMs) of Na8H[A-PW9O34]·7H2O and Na8H[B-PW9O34]·19H2O (Na-A-PW9 and Na-B-PW9) as highlyselective and efficient heterogeneous Lewis base catalysts for Knoevenagel condensation, cyanosilylation of various aldehydes and ketones and the synthesis of benzoxazole derivatives at 25 °C under mild conditions. Since both Na-A-PW9 and Na-B-PW9 display no characteristic porosity
Classical Keggin Intercalated into Layered Double Hydroxides: Facile Preparation and Catalytic Efficiency in Knoevenagel Condensation Reactions
作者:Yueqing Jia、Yanjun Fang、Yingkui Zhang、Haralampos N. Miras、Yu-Fei Song
DOI:10.1002/chem.201501953
日期:2015.10.12
Knoevenagel condensationreactions of various aldehydes and ketones with Z‐CH2‐Z′ type substrates (ethyl cyanoacetate and malononitrile) at 60 °C in mixed solvents (V2‐propanol:Vwater=2:1) demonstrated highly efficient catalytic activity. The synergistic effect between the acidic and basic sites of the Mg3Al‐PW12 composite proved to be crucial for the efficiency of the condensationreactions. Additionally
Green and Efficient Knoevenagel Condensation Catalysed by a DBU Based ionic Liquid in Water
作者:An-Guo Ying、Li-Min Wang、Le-Le Wang、Xin-Zhi Chen、Wei-Dong Ye
DOI:10.3184/030823409x12616597939085
日期:2010.1
An efficient, clean and facile protocol for the Knoevenagel condensation of aromatic aldehydes with active methylene compounds catalysed by task specific ionic liquid 1,8-diazabicyclo[5.4.0]-undec-7-en-8-ium acetate in an aqueous medium has been developed. The reactions proceed at room temperature and high to excellent yields were afforded. The workup procedure is very simple. The ionic liquid could