在目前的工作中,合成了作为新型离子液体的1,3-二磺酸苯并咪唑鎓盐,并对其FT-IR,1 H NMR,13 C NMR以及质谱进行了表征。该离子液体用作高效,均质和可回收的催化剂,可通过以下途径合成高度官能化的四氢吡啶在无溶剂条件下,单锅多组分缩合芳族醛,乙酰乙酸乙酯和苯胺。当前的合成路线是一种绿色方案,具有几个优点,例如产品收率高,反应时间短,反应条件温和,化学废物最少,后处理程序容易。此外,该催化剂可以重复使用和回收至少四次而没有明显的活性损失。
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
Multicomponent preparation of highly functionalized piperidines using magnesium hydrogen sulfate as an efficient catalyst
作者:Mohammad Reza Mohammad Shafiee、Batool Hojati Najafabadi、Majid Ghashang
DOI:10.1007/s11164-012-0878-1
日期:2013.10
Abstract A simple, highly versatile, and efficientsynthesis of functionalized piperidines is achieved by four-component cyclo-condensation of aldehydes, aromatic amines, and acetoacetic esters using magnesium hydrogensulfate [Mg(HSO4)2] as a catalyst in acetonitrile as the solvent at roomtemperature. The key advantages of this procedure are high yields, easy work-up, and purification of products
Fe(NO3)3·9H2O is used as an efficient and effective catalyst for the one‐pot three‐component synthesis of highlyfunctionalizedpiperidines from aromatic aldehydes, anilines and b–ketoesters in ethanol at ambient temperature. This procedure includes some important aspects like the easy work‐up, no need to column chromatography, simple and readily available precursors, and good to high yields.
Cerium Ammonium Nitrate-Catalyzed Multicomponent Reaction for Efficient Synthesis of Functionalized Tetrahydropyridines
作者:Hong-Juan Wang、Li-Ping Mo、Zhan-Hui Zhang
DOI:10.1021/co100055x
日期:2011.3.14
A highly atom-economic one-pot synthesis of functionalized tetrahydropyridines by a multicomponent condensation reaction of β-ketoester, two equivalents of aromatic aldehyde, and two equivalents of amine in the presence of a catalytic amount of cerium ammonium nitrate (CAN) is reported. In this way, a series of pharmacologically interesting substituted piperidine derivatives were obtained in moderate
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.