Magnetized melamine‐modified polyacrylonitrile (PAN@melamine/Fe
<sub>3</sub>
O
<sub>4</sub>
) organometallic nanomaterial: Preparation, characterization, and application as a multifunctional catalyst in the synthesis of bioactive dihydropyrano [2,3‐c]pyrazole and 2‐amino‐3‐cyano 4H‐pyran derivatives
the fabricated nanocomposite was used as a heterogeneous catalyst in two multicomponent reactions (MCRs) for the synthesis of biologically active dihydropyrano[2,3-c]pyrazole and 2-amino-3-cyano 4H-pyran derivatives. The corresponding products were obtained in excellent yields without a complicated work-up process. Besides, the prepared nanocatalyst could be recycled and reused at least five consecutive
通过三个主要步骤制备了一种高效的磁性聚合物基纳米材料,包括聚丙烯腈 (PAN) 的合成、用三聚氰胺改性 PAN 以及通过原位构建 Fe 3 O 4 MNP对 PAN@三聚氰胺化合物进行磁化。新型PAN@三聚氰胺/Fe 3 O 4有机金属纳米复合材料通过傅里叶变换红外 (FT-IR) 光谱、能量色散 X 射线 (EDX) 光谱、热重分析 (TGA)、场发射扫描电子显微镜 (FESEM)、透射电子显微镜 (TEM) 等各种技术得到了很好的表征。 )、X 射线衍射 (XRD) 图案和振动样品磁强计 (VSM) 曲线。随后,制备的纳米复合材料在两个多组分反应 (MCR) 中用作多相催化剂,用于合成具有生物活性的二氢吡喃并 [2,3-c] 吡唑和 2-氨基-3-氰基 4H-吡喃衍生物。无需复杂的后处理过程即可以优异的产率获得相应的产品。除了,
Tris-hydroxymethylaminomethane (THAM): a novel organocatalyst for a environmentally benign synthesis of medicinally important tetrahydrobenzo[b]pyrans and pyran-annulated heterocycles
作者:Kapil S. Pandit、Pramod V. Chavan、Uday V. Desai、Makarand A. Kulkarni、Prakash P. Wadgaonkar
DOI:10.1039/c4nj02346c
日期:——
A simple, efficient and environmentally benign protocol has been developed for the one-pot, multicomponent synthesis of medicinallyimportant tetrahydrobenzo[b]pyrans and pyran-annulated heterocycles using a commercially available, inexpensive, non-toxic, and biodegradable tris-hydroxymethylaminomethane (THAM) as a novel organocatalyst. Ambient reaction conditions, wide scope, avoidance of conventional
已经开发了一种简单,有效且对环境无害的方案,用于使用市售,廉价,无毒且可生物降解的三羟甲基甲基甲烷(THAM)一锅,多组分合成重要的药用四氢苯并[ b ]吡喃和吡喃环杂环)作为新型有机催化剂。环境反应条件,宽范围,避免常规分离以及纯化技术以及催化剂连续五次运行的可重复使用性提高了该多组分反应规程歧管的实用性。
Morpholine triflate promoted one-pot, four-component synthesis of dihydropyrano[2,3-c]pyrazoles
作者:Chen-Feng Zhou、Jian-Jun Li、Wei-Ke Su
DOI:10.1016/j.cclet.2016.05.010
日期:2016.11
Abstract A one-pot, four-component reaction of ethyl acetoacetate, hydrazine hydrate, aldehydes, and malononitrile was discussed using Lewis acid catalyst morpholine triflate (MorT) to afford a series of dihydropyrano[2,3- c ]pyrazoles, which were generally catalyzed by organic alkalis. Moderate to excellent yields, no chromatographic purification, and evasion of environmentally hazardous solvents
Hydrolyzed Arabic gum-grafted-polyacrylonitrile@ zinc ferrite nanocomposite as an efficient biocatalyst for the synthesis of pyranopyrazoles derivatives
作者:Fereshte Hassanzadeh-Afruzi、Mohammad Mehdi Salehi、Golnaz Heidari、Ali Maleki、Ehsan Nazarzadeh Zare
DOI:10.1016/j.molstruc.2022.134490
日期:2023.2
hydrolyzation. This bio-based catalyst with a soft three-dimensional cross-linked framework contains distinct acidic and basic sites and could be applied as a powerful catalyst for the one-pot synthesis of pyranopyrazoles derivatives. Using an external magnet, the superparamagnetic nanocomposite could be easily separated. Furthermore, the catalyst can well be utilized at least six times in subsequent reaction
使用水解阿拉伯胶-g-聚丙烯腈/ZnFe 2 O 4 (Hyd AG-g-PAN/ZnFe 2 O 4 ) 催化剂、丙二腈和芳香醛、水合肼的组合有效合成吡唑并吡唑衍生物的催化方法,描述了乙酰乙酸乙酯。该协议依赖于使用基于铁酸锌磁性颗粒的环保非均相催化剂与阿拉伯胶 (AG) 作为骨架、N、N亚甲基双丙烯酰胺(MBA)作为交联剂,过硫酸铵(APS)作为引发剂,碱性溶液用于水解。这种具有柔软的三维交联框架的生物基催化剂包含不同的酸性和碱性位点,可用作吡唑并吡唑衍生物的一锅法合成的强大催化剂。使用外部磁铁,超顺磁性纳米复合材料可以很容易地分离。此外,在失去活性之前,催化剂可以很好地在随后的反应循环中使用至少六次。FT-IR、EDX、TGA、FESEM、VSM 和 XRD 方法用于表征生产的催化剂。取0.01g催化剂在80℃水/乙醇绿色溶剂中,15分钟内二氢吡喃[2,3-c]吡唑的最大产量为96%。技术简单,反应时间短,
l–aspartic acid chelan–Cu (II) complex coted on ZrFe2O4 MNPs catalyzed one–pot annulation and cooperative geminal-vinylogous anomeric–based oxidation reactions
sites. Moreover, the [ZrFe2O4@SiO2–n–Pr–ASP–Cu(II)] complex exhibited significant catalytic activity in the synthesis of Pyrano[2,3–c]pyrazoles and 2–amino–3–cyanopyridine derivatives under green conditions. The mechanisticstudies revealed the same Knoevenagel condensation – Michael addition – cyclization sequence for both of these reactions. However, regarding 2–amino–3–cyanopyridines, a cooperative