Application and developing of iron‐doped multi‐walled carbon nanotubes (Fe/MWCNTs) as an efficient and reusable heterogeneous nanocatalyst in the synthesis of heterocyclic compounds
Iron‐dopedmulti‐walledcarbonnanotubes (Fe/MWCNTs) is an efficient, ecofriendly and reusableheterogeneousnanocatalyst for the one‐pot synthesis of heterocycliccompounds including bis‐spiro piperidines, piperidines, dihydro‐2‐oxopyrroles, pyrazoles and diazepines at room temperature with good to excellent yields. The heterogeneousnanocatalyst was fully characterized by scanning electron microscopy
铁掺杂的多壁碳纳米管(Fe / MWCNTs)是一种高效,生态友好且可重复使用的多相纳米催化剂,用于在室温下单锅合成杂环化合物,包括双螺哌啶,哌啶,二氢-2-氧吡咯,吡唑和二氮杂s温度高到极好的产量。通过扫描电子显微镜(SEM),X射线衍射(XRD),电感耦合等离子体(ICP)和FT-IR分析充分表征了多相纳米催化剂。同样,所有制备的化合物的结构均通过1 H NMR表征,13C NMR,FT-IR,质谱(MS)和元素分析。这些规程的主要优点是温和且绿色的反应条件,较短的反应时间,清洁的反应,操作简单,易于纯化以及可重复使用的多相纳米催化剂的产率高至优异。将该催化剂循环十次而活性没有明显损失。
Bismuth nitrate-catalyzed multicomponent reaction for efficient and one-pot synthesis of densely functionalized piperidine scaffolds at room temperature
作者:Goutam Brahmachari、Suvankar Das
DOI:10.1016/j.tetlet.2012.01.042
日期:2012.3
diastereoselective multicomponent one-pot synthesis of a series of pharmaceutically interesting functionalized piperidine derivatives has been developed based on a low-cost and environmentally benign Bi(NO3)3·5H2O catalyst via tandem reactions of 1,3-dicarbonyl compounds, aromatic aldehydes, and various amines in ethanol at room temperature. High atom-economy, good yields, eco-friendliness, and mild reaction conditions
developed for one-pot, five-component synthesis of highlyfunctionalized piperidines from reactions of β-keto esters, aromatic aldehydes, and various amines catalyzed in acetic acid medium. The reaction proceeded smoothly to generate the corresponding product in good yield. We have found that the use of acetic acid as reaction medium has a remarkable beneficial effect on the reaction, allowing it to
Trityl chloride as an efficient organic catalyst for one-pot, five-component and diastereoselective synthesis of highly substituted piperidines
作者:Seyed Sajad Sajadikhah、Nourallah Hazeri、Malek Taher Maghsoodlou、Sayyed Mostafa Habibi-Khorassani、Anthony C. Willis
DOI:10.1007/s11164-012-0997-8
日期:2014.2
chloride is used as an efficient organic catalyst for the one-pot, five-component and diastereoselective synthesis of highly substituted piperidines by means of reaction between aromatic aldehydes, amines and β -ketoesters in methanol at 50 °C. The structure as well as relative stereochemistry of products was confirmed by single X-ray crystallographic analysis. This homogeneous catalyst procedure includes
1-Methyl-2-oxopyrrolidinium hydrogen sulfate ([Hpyro][HSO4]) is used as an ionic liquid catalyst for the one-potthree-componentsynthesis of highly substituted piperidines from aromatic aldehydes, anilines and β–ketoesters in refluxing ethanol. This homogeneous catalyst procedure has the advantages of easy work-up, no need for column chromatography, simple and readily available precursors, and good