A highlyefficient method for the synthesis of tetrahydrodipyrazolopyridines by a multicomponent reaction of ethyl acetoacetate, an aldehyde, hydrazine and ammonium acetate using an ionicliquid (IL) supported on a FeNi3 nanocatalyst is described. This method provides several advantages including mild reaction conditions, applicability to a wide range of substrates, reusability of the catalyst and
The efficientsynthesis of eleven tetrahydrodipyrazolopyridines (two of which are novel) has been achieved by the multicomponent condensation reaction of ethyl acetoacetate, an araldehyde, hydrazine hydrate and ammonium acetate at room temperature in ethanol in the presence of nano-CuCr2O4. The key advantages of this process are good to high yields, short reaction times, practical simplicity, reusability
New magnetic-responsive deep eutectic catalyst based on Co2+/choline chloride for the synthesis of tetrahydro-pyrazolopyridines and pyrroles in water
作者:Fatemeh Tamaddon、Ali Khorram
DOI:10.1016/j.molliq.2020.112722
日期:2020.4
CoCl42− which provides magnetically recovering of Co4ChDES in cooperation with the four choline groups are hydrogen bond-acceptor and hydrogen bond-donor components of this DES. The 0.75 mol% and 1.5 mol% of Co4ChDES represented high catalytic performance in the water-based multi-component reactions (MCRs) for the synthesis of substituted tetrahydropyrazolopyridines (THDPPs) and pyrroles under very mild conditions
Iron oxide magnetic nanoparticles supported on amino propyl‐functionalized KCC‐1 as robust recyclable catalyst for one pot and green synthesis of tetrahydrodipyrazolopyridines and cytotoxicity evaluation
In this study, paramagnetic dendritic fibrous nano‐silica functionalized by aminopropyltriethoxysilan (Fe3O4@KCC‐1‐nPr‐NH2) was synthesized using a novel hydrothermal protocol and used as a highly efficient, recyclable and heterogeneous nanocatalyst for the synthesis of a wide range of tetrahydrodipyrazolopyridines derivatives (5a‐5 m). The influence of different reaction parameters, such as the effects
在这项研究中,使用新型水热方法合成了被氨基丙基三乙氧基硅烷(Fe 3 O 4 @ KCC-1-nPr-NH 2)官能化的顺磁树枝状纤维纳米二氧化硅,并将其用作高效,可回收和多相的纳米催化剂,用于合成广泛的四氢二吡唑并吡啶衍生物(5a-5 m)。研究了反应条件,溶剂,温度,时间和催化剂浓度对合成四氢二吡唑并吡啶(2a)的影响。该催化剂可重复使用十次,而不会造成催化活性的明显损失。这种新颖的合成方法具有一些优点,包括反应时间短,产率高和后处理步骤简单。最后,通过1 H和13 C NMR,IR和CHN对新合成的四氢二吡唑并吡啶衍生物(5a-5f)进行了表征。
Nanoalkalinecellulose immobilized on magnetic nanoparticles as a green catalyst for the synthesis of tetrahydrodipyrazolopyridines and mechanistic insights under base catalysis
Fe3O4@NAC represented a catalytic advantage in the room-temperature one-pot pseudo-multicomponent synthesis of tetra-hydrodipyrazolopyridines (THDPPs) in water. Mechanistic monitoring supported no requisite to acid/base catalyst in the first phase for rapid formation of intermediate 3-methylpyrazolone (A) by Knorr reaction of the ethylacetoacetate with hydrazine hydrate in water at room temperature. Alternatively
絮凝在 Fe 3 O 4纳米颗粒上的棉衍生的纳米碱性纤维素 (NAC)被分析表征为 Fe 3 O 4 @NAC。与1:有机5.7重量比的无机和基座容量等于7.5毫摩尔HO - /克,中的Fe 3 ö 4 @NAC表示在室温一锅煮的催化优势伪的-multicomponent合成四-氢化二吡唑并吡啶 (THDPP) 在水中。机械监测支持在第一阶段不需要酸/碱催化剂即可快速形成中间体 3-甲基吡唑啉酮 ( A) 通过乙酰乙酸乙酯与水合肼在室温下在水中的克诺反应。或者,Fe 3 O 4 @NAC 在从A合成 THDPP 的进一步反应阶段中显示出催化作用。这种有机金属催化剂具有优异的碱容量、氢键性能和稳定性,因为在五个反应循环后没有显着的活性损失和浸出。