Comparison of the efficiency of two imidazole-based dicationic ionic liquids as the catalysts in the synthesis of pyran derivatives and Knoevenagel condensations
([C4(MIm)2]·2HSO4) were prepared via adequate, solvent-free methods and characterized using FT-IR, 1H NMR, 13C NMR, and potentiometric titration techniques. These reagents were investigated in the synthesis of 5-arylidene (thio)barbituric acids, 2-arylidene malononitriles, 4H-pyrans, and pyrano[2,3-d] pyrimidineones, and their catalytic activities were compared in the promotion of these reactions. Based
catalyst for the synthesis of 4H-pyran scaffolds such as tetrahydrobenzo[b]pyran and pyrano[2,3-d]pyrimidinone(thione) derivatives. The use of inexpensive and bio-compatible reagents for the synthesis of the catalyst, a simple and green procedure for the preparation of the catalyst and products, short reaction times, high yields of the products, and applicability to large-scale synthesis are the prominent
在最近的有机合成中,对环境无害的合成方法的发展引起了越来越多的关注。作为这一概念的一部分,我们的小组使用加巴喷丁和氯化胆碱合成了一种新型的天然深共熔溶剂(NADES)。在通过FTIR,1 H和13 C NMR以及质谱进行表征后,所制备的NADES被用作合成4 H-吡喃骨架如四氢苯并[ b ]吡喃和吡喃并[2,3- d ]的有效催化剂。]嘧啶酮(硫酮)衍生物。廉价的和生物相容性试剂用于催化剂的合成,用于催化剂和产物的制备的简单且绿色的过程,短的反应时间,产物的高产率以及适用于大规模合成是突出的问题。该协议的功能。而且,该催化剂可以容易地回收并循环多达五次,而不会显着损失其催化活性。
Zn[(L)proline]<sub>2</sub>: An Efficient Catalyst for the Synthesis of Biologically Active Pyrano[2,3-<i>d</i>]pyrimidine Derivatives
作者:Majid M. Heravi、Azadeh Ghods、Khadijeh Bakhtiari、Fatemeh Derikvand
DOI:10.1080/00397910903174390
日期:2010.6.16
derivatives were efficiently synthesized in excellent yields by a three-component, one-pot condensation reaction of malononitrile, benzaldehydes, and barbituric acid using a catalytic amount of Zn[(L)proline].
ABSTRACT A basicionicliquid, namely 1,1′-(butane-1,4-diyl)bis(1,4-diazabicyclo [2.2.2]octan-1-ium) hydroxide, was prepared and characterized using Fourier-transform infrared spectroscopy, 1H nuclear magnetic resonance spectroscopy, and pH measurements. The ionicliquid was used for efficient promotion of the synthesis of pyrano[2,3-d]pyrimidinone and pyrido[2,3-d]pyrimidine derivatives at room temperature
Ferric metformin drug complex supported on magnetic nanofiber cellulose; An efficient access to 4-H pyrans derivatives and determination of their antimicrobial activity
ferric metformin and a novel nanocatalyst was prepared. This green heterogeneous organometallic catalyst was analyzed by physiochemical techniques. The new metformin drug complex supported on magnetic NFC was used as a powerful and efficient catalyst for the synthesis of functionalized 4H-pyrans derivatives. The antimicrobial activity of the products showed excellent activity against all the bacterial