Glycerol is applied as a green, biodegradable and reusable promoting medium for one-pot three component synthesis of 4H-pyrans under catalyst-free conditions. A broad range of substrates including aromatic and heteroaromatic aldehydes, isatine derivatives, acenaphthenequinone and ninehydrine are condensed with carbonyl compounds possessing a reactive α-methylene group and alkylmalonates. All reactions are completed in short times, and the products are obtained in good to excellent yields. The reaction medium could be recycled and reused several times without any loss of efficiency.
The introduction of two new imidazole-based bis-dicationic Brönsted acidic ionic liquids and comparison of their catalytic activity in the synthesis of barbituric acid derivatives
sulfate and bis-imidazolium perchlorate as two new bis-dicationic Brönsted acidic ionic liquids based on imidazole is reported. After characterization by FT-IR, mass and NMR spectroscopy and pH titration, the applicability of these reagents is studied in the promotion of the synthesis of 5-arylidene barbituricacids and pyrano[2,3-d] pyrimidinone derivatives. These methods possess some advantages such
在本文中,报道了制备双咪唑硫酸氢盐和双咪唑高氯酸盐作为两种新的基于咪唑的双阳离子布朗斯台德酸性离子液体。通过FT-IR,质谱,NMR光谱和pH滴定法进行表征后,研究了这些试剂在促进5-亚芳基巴比妥酸和吡喃并[2,3- d ]嘧啶酮衍生物的合成中的适用性。这些方法具有一些优点,例如易于制备催化剂,简单的后处理步骤,短的反应时间,优异的产率以及在反应的所有步骤中使用非有机溶剂以及催化剂的良好可重复使用性。
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].
Water Mediated Domino Knoevenagel-Michael-cyclocondensation Reaction of Malononitrile, Various Aldehydes and Barbituric Acid Derivatives Using Boric Acid Aqueous Solution System Compared with Nano-titania Sulfuric Acid
作者:Ardeshir Khazaei、Heidar Ali Alavi Nik、Ahmad Reza Moosavi-Zare
DOI:10.1002/jccs.201500115
日期:2015.8
Nano‐titania sulfuricacid (TSA) and boricacid [B(OH)3] were efficiently utilized for domino Knoevenagel‐Michael‐cyclocondensation reaction of malononitrile, variousaldehydes and barbituricacidderivatives to synthesis of pyrano[2,3‐d]pyrimidine diones. It is interesting that in boricacidaqueoussolutionsystem, H+ which abstracted from water by the interaction with B(OH)3, efficiently catalyzed
New advances in catalytic performance of erbium‐folic acid‐coated CoFe
<sub>2</sub>
O
<sub>4</sub>
complexes for green one‐pot three‐component synthesis of pyrano[2,3‐
<i>d</i>
]pyrimidinone and dihydropyrano[3,2‐
<i>c</i>
]chromenes compounds in water
current research, much attention is paid to heterogenized nanostructure. Herein, we report the green synthesis magnetic nanoparticles (MNPs) of cobalt ferrite by the immobilization of erbium (Er) coated with folic acid (FA) which show effective catalytic properties and recyclability. Full characterizations with field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM)
在当前的研究中,非常关注异质化纳米结构。在此,我们报告了通过固定包覆有叶酸 (FA) 的铒 (Er) 来制备铁氧体钴的绿色合成磁性纳米粒子 (MNP),该纳米粒子显示出有效的催化性能和可回收性。使用场发射扫描电子显微镜 (FE-SEM)、透射电子显微镜 (TEM)、能量色散 X 射线光谱 (EDX)、X 射线原子映射、热重分析 (TGA)、X 射线衍射 ( XRD), 振动样品磁强计 (VSM), i进行了电感耦合等离子体发射光谱(ICP-OES)和傅里叶变换红外(FT-IR)光谱技术来揭示所制备磁性催化剂的结构特性。所获得的纳米杂化复合物作为高效、可回收、绿色的异质体系,为制备吡喃并[2,3- d ]嘧啶酮和二氢吡喃并[3,2- c ]铺平了道路]色烯衍生物,通过各种醛、丙二腈和羟基香豆素或巴比妥酸在绿色条件下的一锅三组分缩合反应。这种易于制备的有机金属催化剂具有许多优点,例如操作简单、