Efficient synthesis of 2-amino-3-cyano-4H-pyran derivatives via a non-catalytic one-pot three-component reaction
作者:Cheng-Wei Lü、Jia-Jing Wang、Fei Li、Shi-Jun Yu、Yue An
DOI:10.1007/s11164-017-3151-9
日期:2018.2
Abstract A convenient one-pot multi-component strategy was conducted successfully under catalyst-free conditions employing water and PEG-400 as the efficient and cheap promoting medium. Three types and nearly 50 2-amino-3-cyano-4H-pyran annulated derivatives were synthesized in good to excellent yields by the condensation of a series of aromatic aldehydes with malononitrile and different 1,3-dicarbonyl
Nano-Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-supported boron sulfonic acid as a novel magnetically heterogeneous catalyst for the synthesis of pyrano coumarins
magnetically heterogeneouscatalyst based on the immobilization of boron sulfonicacid onto Fe3O4@SiO2 nanoparticles (Fe3O4@SiO2–BSA) is reported. Fe3O4@SiO2–BSA was characterized via FT-IR, X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and vibrating sample magnetometer (VSM) analysis. The performance ability of this catalyst including
在这项研究中,报道了一种基于硼磺酸固定在Fe 3 O 4 @SiO 2纳米颗粒(Fe 3 O 4 @SiO 2 -BSA)上的新型磁性非均相催化剂。Fe 3 O 4 @SiO 2 –BSA通过FT-IR,X射线衍射图(XRD),扫描电子显微镜(SEM),能量色散X射线光谱(EDS)和振动样品磁力计(VSM)分析。在无溶剂条件下以高收率评估了该催化剂包括酸位点的性能,以合成吡喃香豆素。催化剂的热稳定性及其易于被磁场分离,使该催化剂成为良好的多相体系,并且是其他多相催化剂的有用替代品。
Sodium ethylene diamine tetraacetate catalyzed synthesis of chromene derivatives via multi-component reactions at low catalyst loading
作者:Lu Chen、Jiaqi Lin、Bin Chen、Liqin Zhao
DOI:10.1007/s11164-017-3015-3
日期:2017.11
An efficient and practical protocol for the synthesis of chromenes derivatives catalyzed by a low-loading sodium ethylene diamine tetraacetate (2 mol%) as a catalyst via multicomponent reaction is reported. A wide range of aromatic aldehydes easily undergo condensations with malononitrile and 4-hydroxycoumarin (4-hydroxy-6-methyl-2-pyrone or dimedone) under mild conditions to afford the desired products
Sodium Tungstate: The First Application as Non-oxidative Catalyst in Organic Synthesis
作者:Saeed Khodabakhshi、Mojtaba Baghernejad
DOI:10.1002/jccs.201300529
日期:2014.5
A convenient synthesis of some pyranocoumarins was described via a one‐pot, three‐component reaction of 4‐hydroxyxoumarin, malononitrile and different aromatic aldehydes in the presence of sodium tungstate. This is the first application of sodium tungstate as non‐oxidative catalyst in organic reactions. Simple operation, use of readily available starting materials, good to excellent yields and short
Fe3O4@SiO2-BenzIm-Fc[Cl]/ZnCl2: a novel and efficient nano-catalyst for the one-pot three-component synthesis of pyran annulated bis-heterocyclic scaffolds under ultrasound irradiation
作者:Mahdi Gholamhosseini-Nazari、Somayeh Esmati、Kazem D. Safa、Alireza Khataee、Reza Teimuri-Mofrad
DOI:10.1007/s11164-018-3704-6
日期:2019.4
synthesized using a novel nano-catalyst via the condensation reaction of different aldehydes, malononitrile and 4-hydroxycoumarin. Kojic acid was also used in the three-component reaction for the synthesis of pyrano[3,2-b]pyran derivatives. The method was successful in the synthesis of various pyrano[2,3-d]pyrimidine derivatives. Additionally, new ultrasound-assisted synthesis protocol was used for the
在这项研究中,使用一种简单的化学共沉淀方法合成了一种新型的可磁恢复的Fe 3 O 4 @SiO 2 -BenzIm-Fc [Cl] / ZnCl 2纳米颗粒。在纳米粒子的FT-IR光谱中,出现了相关的吸收峰,这证实了纳米催化剂的成功合成。在纳米催化剂的EDX光谱中,在其区域上出现了预期的元素。纳米催化剂的X射线衍射图谱表明Fe 3 O 4的晶体分散磁性纳米粒子。根据FE-SEM和TEM图像,纳米颗粒具有相对的单分散性,并且纳米颗粒的平均尺寸为约35nm。在超声波照射下,在多种吡喃环化的双杂环衍生物(38种化合物)的一锅三组分合成中评估了新型磁性纳米粒子的催化活性。引入了一种简单,高效的面部超声辅助方法,用于在室温下通过一锅三组分反应合成稠合的双杂环吡喃衍生物。一系列吡喃[3,2- c通过不同的醛,丙二腈和4-羟基香豆素的缩合反应,使用新型的纳米催化剂合成了] 1,1-二甲基萘衍生物。曲酸还用于三组分反应中,以合成吡喃并[3