Preyssler heteropolyacid supported on silica coated NiFe2O4 nanoparticles for the catalytic synthesis of bis(dihydropyrimidinone)benzene and 3,4-dihydropyrimidin-2(1H)-ones
作者:Hossein Eshghi、Ali Javid、Amir Khojastehnezhad、Farid Moeinpour、Fatemeh F. Bamoharram、Mehdi Bakavoli、Masoud Mirzaei
DOI:10.1016/s1872-2067(14)60265-5
日期:2015.3
Abstract A novel magnetic acidic catalyst comprising Preyssler (H 14 [NaP 5 W 30 O 110 ]) heteropoly acid supported on silica coated nickel ferrite nanoparticles (NiFe 2 O 4 @SiO 2 ) was prepared. The catalyst was characterized by Fourier transform infrared, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy dispersive spectrum, VSM and particle size neasurement
摘要 制备了一种新型磁性酸性催化剂,其包含负载在二氧化硅包覆的铁氧体镍纳米颗粒(NiFe 2 O 4 @SiO 2 )上的 Preyssler (H 14 [NaP 5 W 30 O 110 ]) 杂多酸。通过傅里叶变换红外光谱、扫描电镜、透射电镜、X射线衍射、能谱、VSM和粒度测定对催化剂进行了表征。通过Biginelli反应研究了其在合成双(二氢嘧啶酮)苯和3,4-二氢嘧啶-2(1 H)-酮衍生物中的催化活性。使用催化剂,反应在不到 1 小时内发生,产率非常好。更重要的是,催化剂很容易通过外部磁铁从反应混合物中分离出来,并且可以重复使用至少五次而不会降低活性。
A New Biginelli Reaction Procedure Using Potassium Hydrogen Sulfate as the Promoter for an Efficient Synthesis of 3,4-Dihydropyrimidin-2(1<i>H</i>)-one
conditions have been found to carry out the Biginellireaction for the synthesis of 3,4-dihydropyrimidin-2(1H)-one derivatives. This synthesis was performed usingpotassiumhydrogensulfate as the promoter in glycol solution. Compared with the classical Biginellireaction conditions, this new method has the advantage of excellent yields (85-99%) and short reaction time (0.5-2 h).
Efficient and Green Microwave-Assisted Multicomponent Biginelli Reaction for the Synthesis of Dihydropyrimidinones Catalyzed by Heteropolyanion-Based Ionic Liquids Under Solvent-Free Conditions
Abstract An efficient and green route for the synthesis of dihydropyrimidinones via microwave-assisted Biginellireactioncatalyzed by 3 mol% of heteropolyanion-based ionic liquids undersolvent-freeconditions has been reported. The practical reaction was found to be compatible with different structurally diverse substrates. Good to excellent yields, short reaction times, and operational simplicity
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。
The development of an ecofriendly procedure for alkaline metal (II) sulfate promoted synthesis of<i>N</i>,<i>N</i>â²-dimethyl substituted (unsubstituted)-4-aryl-3,4-dihydropyrimidones (thiones) and corresponding bis-analogues in aqueous medium: Evaluation by green chemistry metrics
作者:Chhanda Mukhopadhyay、Arup Datta
DOI:10.1002/jhet.283
日期:——
Different alkalinemetal (II) sulfates were used as catalysts for the N,N′-dimethylsubstituted as well as unsubstituted 4-aryl-3,4-dihydropyrimidones (thiones) and their correspondingbis-analogues in aqueousmedium. Among the various salts, MgSO4·7H2O (Epsom salt) proved to be the best catalyst giving the desired products in good to excellent yields. This catalyst enables the construction of a series