Trityl bromide versus nano-magnetic catalyst in the synthesis of henna-based xanthenes and bis-coumarins
作者:Mahmoud Zarei、Mohammad Ali Zolfigol、Ahmad Reza Moosavi-Zare、Ehsan Noroozizadeh
DOI:10.1007/s13738-017-1155-4
日期:2017.10
trityl bromide (TrBr) as a new, efficient, mild and neutral catalyst was used for the synthesis of henna-based xanthenes (aryl-5H-dibenzo[b,i]xanthene-5,7,12,14(13H)-tetraones) and bis-coumarins by in situ generation of trityl carbocation undersolvent-freeconditions in comparison with [Fe3O4@SiO2@(CH2)3-Im-SO3H]Cl as an acidic and reusablecatalyst for the first time. Graphical Abstract
BiVO4-NPs: an efficient nano-catalyst for the synthesis of biscoumarins, bis(indolyl)methanes and 3,4-dihydropyrimidin-2(1H)-ones (thiones) derivatives
作者:Farhad Shirini、Monireh Pourghasemi Lati
DOI:10.1007/s13738-016-0959-y
日期:2017.1
4-dihydropyrimidin-2(1H)-ones (thiones) derivatives. The structures of the products were characterized by IR, 1HNMR and 13C NMR spectroscopy and comparison with the authentic samples. Easy work-up procedure, excellent yields, short reaction times and reusability of the catalyst are some advantages of this work. In addition, in this article and for the first time, the preparation of 3,4-dihydropyrimidin-2(1H)-ones
BiVO 4 -NPs可用作促进双香豆素,双(吲哚基)甲烷和3,4-二氢嘧啶-2(1 H)-ones(thiones)衍生物合成的有效且可重复使用的纳米催化剂。产物的结构通过IR,1 H NMR和13 C NMR光谱表征,并与真实样品进行比较。简便的后处理程序,优异的收率,较短的反应时间和催化剂的可重复使用性是这项工作的一些优势。另外,在本文中并且首次报道了从醛的被保护的衍生物包括肟,半咔唑酮和1,1-二乙酸酯制备3,4-二氢嘧啶-2(1 H)-酮和-硫酮的报道。
Brønsted acidic ionic liquids of aza-crown ether complex cations: preparation and applications in organic reactions
作者:Chen Cheng、Huanwang Jing
DOI:10.1039/c4ra03061c
日期:——
of an aza-crownether chelated potassium cation and various anions, were designed, synthesized and characterised by FTIR, NMR and mass spectrometry, thermogravimetric differential thermal analysis (TG-DTA) and elemental analysis. These new Brønsted acidic ionic liquids of aza-crownether complex cations (aCBAILs) were applied as catalysts to the Biginelli reaction, Mannich reaction and synthesis of
A clean synthesis of bis(indolyl)methane and biscoumarin derivatives using P<sub>4</sub>VPy–CuO nanoparticles as a new, efficient and heterogeneous polymeric catalyst
the green, simple and highly efficient synthesis of bis(indolyl)methanes and 3,3′-(arylmethylene)bis(4-hydroxycoumarins). This methodology has some advantages such as short reaction times, environmentally friendly conditions, easy work-up, and excellent yields. This catalyst can be easily separated and re-used without any appreciable loss in its activity.
P 4 VPy-CuO纳米颗粒作为新型固体催化剂,采用超声辐照法合成,并通过X射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM)和傅立叶变换红外光谱(FT-IR)表征)光谱学。制备的催化剂用于绿色,简单,高效的双(吲哚基)甲烷和3,3'-(芳基亚甲基)双(4-羟基香豆素)的合成。该方法具有一些优点,例如反应时间短,环境友好的条件,易于后处理和优异的收率。该催化剂可以容易地分离和重复使用,而其活性没有任何明显的损失。
Heterogeneous
<scp>
SO
<sub>3</sub>
H
</scp>
@
<scp>
Fe
<sub>3</sub>
O
<sub>4</sub>
</scp>
magnetic nanocatalyst as an efficient and reusable medium for the synthesis of 3,3′‐(arylmethylene)‐bis‐(4‐hydroxycoumarin), bis‐(indolyl)‐methane, and 1,8‐dioxo‐octahydroxanthene derivatives
作者:Xiaobo Wu、Wan‐Xi Peng
DOI:10.1002/jccs.202000087
日期:2020.11
This work aimed to synthesize a new heterogeneous catalyst (SO3H@Fe3O4 magnetic nanoparticles) and the study of its catalytic behavior in synthesizing 3,3′‐(arylmethylene)‐bis‐(4‐hydroxycoumarin), bis‐(indolyl)‐methane, and 1,8‐dioxo‐octahydroxanthene derivatives. The characterization of obtained material has been performed by means of Fourier‐transform infrared spectroscopy, thermogravimetric analysis
这项工作旨在合成一种新的非均相催化剂(SO 3 H @ Fe 3 O 4磁性纳米粒子),并研究其在合成3,3'-(芳基亚甲基)-双-(4-羟基香豆素),双-(吲哚基)-甲烷和1,8-二氧代-八氢氧杂蒽衍生物。通过傅立叶变换红外光谱,热重分析,X射线衍射,振动样品磁力计和透射电子显微镜对获得的材料进行表征。与以前的方法相比,这种新方法的主要特性是反应时间短,反应条件温和,通过永久磁场简单回收催化剂,具有出色的收率,并且催化剂可重复使用至少六次。