Green Synthesis of Pyrano[2,3‐d]‐pyrimidine Derivatives in Ionic Liquids
摘要:
Pyrano[2,3-d]pyrimidine derivatives were synthesized in high yields by a condensation reaction between arylmethylidenemalononitrile and barbituric acid using room-temperature ionic liquids such as 1- n -butyl-3-methylimidazolium tetrafluoroborate ([BMIm]BF4) or 1-butylpyridinium tetrafluoroborate ([BPy]BF4) as solvents under neutral conditions.
compounds containing at least one core moiety of pyrano[2,3-d]pyrimidine have received considerable attention in synthetic organic chemistry because of their potential as drugs and bioactive compounds. Pyrano[2,3-d]pyrimidines have attracted interest in medicine as antitumor, anti-hypertensive, antibacterial and antileishmanial drugs. Pyrano[2,3-d]pyrimidines have been produced by a number of methods. A
characterized by various analytical methods and suitably used for facilitating the organicsynthesis reactions. Briefly, high reaction yield (99%) has been obtained in short reaction times (4 min) in the synthesis reactions of chromene pharmaceutical derivatives, through applying this highly efficient organometallic catalyst. From mechanistic aspect, effective electronic interactions between heteroatoms
4,4’-trimethylenedipiperidine as a nitrogen heterocycle solvent and/or catalyst: Liquid phase tandem Knoevenagel–Michael condensation
作者:Lia ZAHARANI、Nader GHAFFARI KHALIGH、Hayede GORJIAN、Mohd RAFIE JOHAN
DOI:10.3906/kim-2010-41
日期:——
Liquid phase tandem Knoevenagel-Michael condensation of various aromatic and heteroaromatic aldehydes with barbituric acid or 2-thiobarbituric acid and malononitrile was studied in a one-pot three-component reaction. For the first time, TMDP was employed as a safe and efficient solvent and/or catalyst in the liquid and aqueous ethanol medium, respectively, for the practical and eco-friendly Knoevenagel-Michael
SCMNPs@Urea/Py-CuCl<sub>2</sub>: a recyclable catalyst for the synthesis of pyrano[2,3-<i>d</i>]pyrimidinone and pyrano[2,3-<i>d</i>] pyrimidine-2,4,7-trione derivatives
作者:Jun Zhang、Hongqing Song、Ruirui Cui、Chaoyong Deng、Qahtan A. Yousif
DOI:10.1080/00958972.2020.1737681
日期:2020.2.16
Abstract An efficient, simple, and mild strategy for the one-pot multicomponent synthesis of pyrano[2,3-d]pyrimidinone and pyrano[2,3-d]pyrimidine-2,4,7-trione derivatives is described using SCMNPs@Urea/Py-CuCl2 nanoparticles as a reusable heterogeneous magnetic nanocatalyst. The catalyst was characterized using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating
In this study, a novel magnetic mesoporous MCM‐41 silica supported ionicliquid/palladium complex (Fe3O4@MCM@IL/Pd) with core‐structure was prepared and characterized and its catalytic performance was developed under green conditions. The Fe3O4@MCM@IL/Pd was prepared via a post grafting method and was characterized using Fourier transform infrared spectroscopy, thermal gravimetric analysis, wide‐ and
在这项研究中,制备并表征了一种新型的磁介孔MCM-41二氧化硅负载型离子液体/钯配合物(Fe 3 O 4 @ MCM @ IL / Pd),并对其进行了表征,并在绿色条件下开发了其催化性能。通过后接枝方法制备Fe 3 O 4 @ MCM @ IL / Pd,并使用傅里叶变换红外光谱,热重分析,宽和低角度粉末X射线衍射,扫描电子显微镜,透射电子显微镜对其进行表征。 ,振动样品磁力计和能量色散X射线分析。这被用作一种高效且可回收的纳米催化剂,用于一锅合成吡喃并[2,3- d在超声条件下的嘧啶衍生物。将该催化剂磁性回收并连续使用12个循环,而不会显着降低其活性和选择性。