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。
Heterogeneous AlPO4(SO3H) nanosheets: novel catalyst for the multi-component synthesis of quinazolinones and highly functionalized piperidines
AbstractNanosheets AlPO4(SO3H) as a highly active solid acid catalyst were prepared and characterized. The morphology of obtained catalyst exhibited nanosheets with ∼ 25–35 nm thickness. The heterogeneous nanocatalyst was characterized by FT-IR, EDX, and FE-SEM analysis. The nanosulfonated-AlPO4 were found useful for cyclization synthesis of highlyfunctionalizedpiperidines and quinazolinones derivatives
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
Nanomagnetically modified ferric hydrogen sulfate (NiFe2O4@SiO2-FHS): a reusable green catalyst for the synthesis of highly functionalized piperidine derivatives
作者:Mohammad Rahimizadeh、Seyed Mohammad Seyedi、Mohsen Abbasi、Hossein Eshghi、Amir Khojastehnezhad、Farid Moeinpour、Mehdi Bakavoli
DOI:10.1007/s13738-014-0546-z
日期:2015.5
An efficient and one-pot multi-component procedure for the preparation of functionalized piperidine derivatives from reactions of aromatic aldehydes, substituted anilines and ethyl acetoacetate in the presence of ferric hydrogen sulfate-supported silica-coated magnetic nanoparticles (NiFe2O4@SiO2-FHS) as a magnetically recyclable green catalyst has been developed. The catalysts show environmentally benign character, which can be easily prepared, stored, and recovered several times without obvious significant loss of activity.