Synthesis, characterization and first application of keggin-type heteropoly acids supported on silica coated NiFe<sub>2</sub>O<sub>4</sub>as novel magnetically catalysts for the synthesis of tetrahydropyridines
作者:Hossein Eshghi、Amir Khojastehnezhad、Farid Moeinpour、Mehdi Bakavoli、Seyed Mohammad Seyedi、Mohsen Abbasi
DOI:10.1039/c4ra05133e
日期:——
In this study, two heteroploly acids with Keggin structures (phosphotungestic acid (PWA) and phosphomolybdic acid (PMA)) have been supported on silica coated nickel ferrite nanoparticles (NiFe2O4@SiO2). The synthesized catalysts were characterized by several methods (FT-IR, SEM, TEM, VSM, XRD, BET and ICP-AES), and the catalytic activities of these new and magnetic catalysts in synthesis of tetrahydropyridine derivatives have been investigated. These new catalysts showed that they can carry out reactions at room temperature in a short time and under solvent-free conditions. Moreover, the obtained results indicated that PWA supported NiFe2O4@SiO2 is a stronger acid than PMA to run these reactions. More importantly, the catalysts were easily isolated from the reaction mixture by a magnetic bar and reused at least five times without significant degradation in their activities.
Ruthenium Chloride Catalysed Multicomponent Reaction for Efficient and One-Pot Synthesis of Functionalised Tetrahydropiperidines at Room Temperature
作者:Sedigheh Mohammadi、Mohsen Abbasi
DOI:10.3184/174751915x14230617481292
日期:2015.2
a Lewis acid catalyst for the one-pot three-component synthesis of highly functionalised tetrahydropiperidines from aromatic aldehydes, anilines and ethylacetoacetate in ethanol at ambient temperature without any ligand or activator. The simple experimental procedure, high yields of products, no need for column chromatography, and short reaction times compared to other catalysts are some of the advantages
Design of ionic liquid sulfonic acid pyridinium hydrogen sulfate as an efficient, eco-friendly, and reusable catalyst for one-pot synthesis of highly functionalized tetrahydropyridines
作者:Sedigheh Mohammadi、Mohsen Abbasi
DOI:10.1007/s11164-015-1934-4
日期:2015.11
Novel ionic liquid sulfonicacid pyridinium hydrogen sulfate ([Pyridine-SO3H]HSO4) is synthesized and characterized by various techniques such as FT-IR, 1H NMR, 13C NMR, TG, DTG, as well as mass spectra. This ionic liquid is used as an efficient, homogeneous, and recyclable catalyst for one-pot synthesis of highly functionalized tetrahydropyridines from the three-component condensation of aromatic
合成了新型离子液体磺酸吡啶鎓硫酸氢盐([吡啶-SO 3 H] HSO 4),并通过多种技术进行了表征,例如FT-IR,1 H NMR,13 C NMR,TG,DTG以及质谱。这种离子液体用作无溶剂条件下由芳族醛,乙酰乙酸乙酯和取代的苯胺的三组分缩合反应一锅合成高官能化四氢吡啶的有效,均质和可循环使用的催化剂。该方案的主要优点是反应时间短,产率高,温和清洁的条件以及多次重复使用时间而不会明显降低催化活性。
Mohammadi, Seddigheh; Ghazanfari, Dadkhoda; Karimi-Jaberi, Zahed, Revue Roumaine de Chimie, 2017, vol. 62, # 11, p. 825 - 829
Moreover, some of themhavebeenfoundtobeusefulasinhibitorsofaminopeptidaseandalpha-glucosidase. Numerous recent methods reported for the synthesis of highly substituted piperidines use various catalytic systems such as bismuth nitrate, molecular iodine, bromodimethyl-sulfonium bromide (BDMS), tetra(n-butyl)ammonium tribromide (TBATB), InCl3, 21 CAN, ZrOCl2.8H2O, 23 picric acid, ionicliquids, ZrCl4, 26