(α-Fe2O3)-MCM-41 as a magnetically recoverable nanocatalyst for the synthesis of pyrazolo[4,3-c]pyridines at room temperature
摘要:
MCM-41 embedded magnetic nanoparticles which was prepared through the formation of MCM-41 in the presence of Fe3O4 nanoparticles has been used as a magnetically recoverable catalyst for the synthesis of new series of pyrazolo[3,4-c]pyridine derivatives. This catalyst with 10 wt.% of loaded iron oxide nanoparticles was highly recyclable (up to 5 times), and was easily recovered from the reaction mixture using an external magnet without loss of activity. The prepared magnetic catalyst is characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), nitrogen physisorption measurements, and acid-base titration. (C) 2012 Elsevier B.V. All rights reserved.
Magneticgrapheneoxide functionalized with sulfonicacid (Fe3O4‐GO‐SO3H) was used as a new recyclable nanocatalyst for one‐pot synthesis of N‐aryl‐2‐amino‐1,6‐naphthyridine derivatives under solvent free conditions. The catalyst could be easily recovered from the reaction mixture by an external magnet and reused without significant decrease in activity even after 4 runs. This nanocatalyst exhibited
磺酸功能化的磁性氧化石墨烯(Fe 3 O 4 -GO-SO 3 H)被用作一种新的可回收纳米催化剂,用于在无溶剂条件下一锅法合成N-芳基-2-氨基-1,6-萘啶衍生物。可以容易地通过外部磁体从反应混合物中回收催化剂,并且即使在4次运行后,活性也不会显着降低地重复使用。该纳米催化剂显示出比其他市售磺酸催化剂更好的活性。
(α-Fe2O3)-MCM-41-SO3H as a novel magnetic nanocatalyst for the synthesis of N-aryl-2-amino-1,6-naphthyridine derivatives
The new (alpha-Fe2O3)-MCM-41-SO3H catalyst was prepared directly through the reaction of chlorosulfonic acid with silica-coated nanoparticles (alpha-Fe2O3)-MCM-41 and used as a magnetically recyclable catalyst for an efficient one-pot synthesis of N-aryl-2-amino-1,6-naphthyridine derivatives. The catalyst with 10 wt% of loaded iron oxide nanoparticles could be recovered from the reaction mixture by an external magnet and reused without significant decrease in activity even after 5 runs. This new prepared catalyst exhibited better activities to other commercially available sulfonic acid catalysts. (C) 2012 Elsevier B.V. All rights reserved.