MgFe2O4/cellulose/SO3H nanocomposite: a new biopolymer-based nanocatalyst for one-pot multicomponent syntheses of polysubstituted tetrahydropyridines and dihydropyrimidinones
摘要:
制备了一种新型生物聚合物纤维素基磁性异相催化剂--MgFe2O4/纤维素/SO3H 纳米复合材料。利用傅立叶变换红外光谱、X 射线衍射、能量色散 X 射线、场发射扫描电子显微镜、热分析(TG、DTG 和 DSC)、动态光散射和振动样品磁力计测量来表征该催化剂。然后,在无溶剂条件下,将其作为一种廉价的绿色催化剂有效地应用于两种多组分合成多取代四氢吡啶和二氢嘧啶酮的过程中。该纳米催化剂可多次回收和重复使用,而不会明显丧失催化活性。
Mass spectroscopy. Results: One-pot multi-component condensation of 2-naphthol with arylaldehydes and thioacetamide catalyzed by nano-[DSPECDA][HSO4] under green, mild and solvent-freeconditions led to 1-thioamidoalkyl-2-naphthols in high yields. The nanocatalyst was also used for the preparation of functionalized tetrahydropyridines by the one-pot multi-component reaction of anilines, arylaldehydes
目的和目的:Nano-2-[N',N'-dimethyl-N'-(silica-n-丙基)ethanaminium chloride]-N,N-dimethylaminium bisulfate (nano-[DSPECDA][HSO4])用作一种高效的非均相二氧化硅基纳米结构催化剂,用于合成 1-硫代氨基烷基-2-萘酚和取代的四氢吡啶。 材料与方法:预期产品在温和条件下制备。在这项工作中,合成了三种新型 1-硫代酰胺烷基-2-萘酚和两种新型四氢吡啶衍生物,并通过 IR、1 H 和13 C NMR 和质谱进行了表征。 结果:纳米-[DSPECDA][HSO 4 ] 催化2-萘酚与芳醛和硫代乙酰胺在绿色、温和、无溶剂条件下的一锅多组分缩合反应得到高收率的1-硫代氨基烷基-2-萘酚。该纳米催化剂还用于在无溶剂和温和条件下通过苯胺、芳基醛和乙酰乙酸乙酯的一锅多组分反应制备官能化四氢吡啶。 结论:
Al(H2PO4)3 as an efficient and reusable catalyst for the multi-component synthesis of highly functionalized piperidines and dihydro-2-oxypyrroles
Extremely facile and efficient procedures have been developed for the synthesis of highlyfunctionalizedpiperidines and dihydro-2-oxypyrroles via one-pot multi-component reactions in the presence of Al(H2PO4)3 as a heterogeneous and eco-friendly catalyst under mild conditions. The multi-component reaction of aromatic aldehydes, aromatic amines, and β-keto esters catalyzed by Al(H2PO4)3 in EtOH at room
在Al(H 2 PO 4)3作为非均相和生态友好型催化剂的存在下,通过单锅多组分反应合成高度官能化的哌啶和二氢-2-氧基吡咯的方法极为简便有效。温和的条件。Al(H 2 PO 4)3催化的芳香醛,芳香胺和β-酮酯的多组分反应在室温下,在乙醇中提供高官能度的哌啶,收率良好至极佳。这些功能化的哌啶的结构和相对立体化学通过单X射线晶体学分析证实。发现相同的催化剂可用于在环境温度下使用胺,乙炔二羧酸二烷基酯和甲醛在甲醇中的四组分反应来合成多官能化的二氢-2-氧基吡咯。发现该催化剂是可回收的,并且可以使用多达五次而不会显着降低其活性。
Diastereoselective Synthesis of Symmetrical and Unsymmetrical Tetrahydropyridines Catalyzed by Bi(III) Immobilized on Triazine Dendrimer Stabilized Magnetic Nanoparticles
作者:Beheshteh Asadi、Amir Landarani-Isfahani、Iraj Mohammadpoor-Baltork、Shahram Tangestaninejad、Majid Moghadam、Valiollah Mirkhani、Hadi Amiri Rudbari
DOI:10.1021/acscombsci.6b00180
日期:2017.6.12
the first time from a five-component Fe3O4@TDSN-Bi(III)-catalyzed reaction of aryl aldehydes, aryl amines, and ethyl acetoacetate. This magnetically separable catalyst enabled the selective incorporation of two different aryl amines or two different aryl aldehydes into the product, and provided excellent yields, short reaction times, mild reaction conditions, satisfactory catalyst recyclability, and
首次从五组分Fe 3 O 4 TDSN-Bi(III)催化的芳基醛,芳基胺和乙酰乙酸乙酯的反应中获得不对称的1,2,5,6-四氢吡啶-3-羧酸酯。该磁性可分离的催化剂能够将两种不同的芳基胺或两种不同的芳基醛选择性地掺入产物中,并提供优异的收率,较短的反应时间,温和的反应条件,令人满意的催化剂可回收性和较低的催化剂负载量。
Alum as an efficient catalyst for the multicomponent synthesis of functionalized piperidines
作者:Ramneet Kaur、Annah Gupta、Kamal K. Kapoor
DOI:10.1007/s11164-017-2979-3
日期:2017.11
An effective approach to the synthesis of functionalized piperidines via a one-pot multicomponent reaction of aniline, β-ketoester and aldehyde in the presence of alum as an efficient catalyst has been reported. The present procedure offers advantages such as simple workup, short reaction time and offers rapid access to a variety of functionalized piperidines.
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.