摘要 通过柳氮磺吡啶铁与作为磁性生物聚合物表面的纳米材料CoFe 2 O 4 -纤维素反应,制备了绿色纳米催化剂。这种新型非均相有机金属催化剂通过 X 射线衍射、场发射扫描电子显微镜、FT-IR 光谱、热重分析和 X 射线能量色散分析以及电感耦合等离子体质谱法进行了表征。这种负载在 CoFe 2 O 4 纤维素上的绿色柳氮磺吡啶药物复合物被用作有机反应的有效且可回收的催化剂,例如功能化 4H-吡喃和 1,4-二氢吡啶衍生物的合成。所有的反应都在温和的条件下在很短的反应时间内成功进行。使用过的催化剂很容易分离并重复使用 6 次,而其催化活性没有明显损失。图形摘要
Synthesis and application of chitosan supported vanadium oxo in the synthesis of 1,4-dihydropyridines and 2,4,6-triarylpyridines <i>via</i> anomeric based oxidation
作者:Maliheh Safaiee、Bahar Ebrahimghasri、Mohammad Ali Zolfigol、Saeed Baghery、Abbas Khoshnood、Diego A. Alonso
DOI:10.1039/c8nj02062k
日期:——
area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma mass spectrometry (ICP-MS). The synthesized catalyst has been successfully used as a reusable catalyst in the synthesis of dihydropyridines and triarylpyridines.
A series of aza-crown ether ionic liquids supported on magnetic Fe3O4@SiO2 core–shell particles were designed, synthesized and characterized by elemental analysis, TEM, TG and FT-IR. These new aza-crown ether complex cation ionic liquids were utilized as heterogeneous acidic catalysts in Friedel–Crafts alkylation and Hantzsch reaction in good yields under convenient reaction conditions. Moreover, these
设计,合成并通过元素分析,TEM,TG和FT-IR表征了在磁性Fe 3 O 4 @SiO 2核-壳颗粒上负载的一系列氮杂-冠醚离子液体。这些新型的氮杂-冠醚络合物阳离子离子液体在便利的反应条件下,以良好的收率被用作Friedel-Crafts烷基化和Hantzsch反应中的多相酸性催化剂。而且,这些磁性颗粒负载的IL催化剂可以容易地通过外部磁体回收并重复使用五次而没有明显的活性损失。
Anchored sulfonic acid on silica-layered NiFe2O4: A magnetically reusable nanocatalyst for Hantzsch synthesis of 1,4-dihydropyridines
Abstract In this study, the immobilization of sulfonicacid on silica-layered nickel ferrite, NiFe2O4@SiO2@SO3H, was investigated. The sulfonated Ni-nanocatalyst was then characterized using FT-IR, SEM, EDX, XRD and VSM analyses. Catalytic activity of the Ni-nanocomposite was also studied towards Hantzsch synthesis of 1,4-dihydropyridines via one-pot condensation reaction of 1,3-diketones (ethyl acetoacetate
Synthesis of 1,4-Dihydropyridines Using Ce(SO<sub>4</sub>)<sub>2</sub>-SiO<sub>2</sub>as Catalyst under Solvent-free Conditions
作者:Wen Pei、Qin Wang、Xiaonian Li、Li Sun
DOI:10.1002/cjoc.201090101
日期:2010.1
A facile and efficient one‐pot synthesis of 1,4‐dihydropyridines from aldehyde, 1,3‐dicarbonyl compounds and ammonium acetate in the presence of Ce(SO4)2‐SiO2 at 80°C under solvent‐freeconditions is described. Compared with the classical Hantzsch reaction, this novel method consistently has the advantages of excellent yields and short reaction time.
New magnetic nanocomposites of ZrO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–Fe<sub>3</sub>O<sub>4</sub>as green solid acid catalysts in organic reactions
作者:Anqi Wang、Xiang Liu、Zhongxing Su、Huanwang Jing
DOI:10.1039/c3cy00572k
日期:——
A series of magnetic solid acid nano-catalysts were designed and prepared through a facile co-precipitate approach. The original nanocomposites ZrO2âAl2O3âFe3O4 were characterized by means of ICP-AES, BET, XRD, TEM, HRTEM, VSM, FT-IR, NH3-TPD and TG. Their catalytic behaviours were investigated via esterification, the synthesis of bis-indolylmethanes, Hantzsch reaction, Biginelli reaction and Pechmann reaction. In all of these organic reactions, the corresponding products were obtained in moderate to excellent yields. The optimal catalyst was ZAF-16/16, which retained catalytic activity after several recycles.