Acetic Acid-Mediated Synthesis of Kojic Acid Derivatives
作者:Y. B. Kiran、G. Rambabu、V. Vijayakumar、L. C. A. Barbosa
DOI:10.1134/s1070428021070162
日期:2021.7
acetic acid-mediated synthesis of kojicacidderivatives through a multicomponent reaction (MCR) has been developed. This new protocol is simple and efficient; it involves a one-pot reaction of equimolar amounts of kojicacid, aromatic aldehydes, and several active methylene compounds at 90°C in 3 h and results in the formation of a wide range of kojicacidderivatives with high yields. Furthermore, the
Anchoring of nickel (II) kojic acid in functionalized Si-MCM‐41 matrix: a effective nanocatalyst for the catalytic clean synthesis of dihydropyrano[3,2-b]chromenediones
作者:Khadijeh Ojaghi Aghbash、Nader Noroozi Pesyan
DOI:10.1007/s13738-021-02395-6
日期:2022.4
Green solventless preparation of dihydropyrano[3,2-b]chromenediones was developed by a three-component reaction (3-CR) of dimedone, different aldehydes, and kojic acid that catalyzed with nano-silica-MCM‐41‐kojic acid‐Ni as a reusable, efficient, and high yielding nanocatalyst. The reactions were completed at 100 °C in 20 min using 5 mg of nanocatalyst under neat conditions to synthesize 1 mmol of
纳米二氧化硅-MCM-41-曲酸-Ni催化二甲酮、不同醛和曲酸的三组分反应(3-CR)开发了二氢吡喃并[3,2- b ]色内二酮的绿色无溶剂制备作为一种可重复使用、高效且高产的纳米催化剂。使用 5 mg 纳米催化剂在纯条件下在 100 °C 下在 20 分钟内完成反应,以高产率合成 1 mmol 产物。通过后接枝法制备纳米二氧化硅-MCM-41-KA-Ni,并使用XRD、ICP、EDX、TGA、DTA、SEM和TEM分析对其进行表征。使用过的纳米催化剂很容易通过离心回收并有效地再利用 5-循环,而其硅酸盐结构中孔率没有显着变化,其催化活性也没有显着降低。 图形摘要
InCl3-catalyzed three-component reaction: a novel synthesis of dihydropyrano[3,2-b]chromenediones under solvent-free conditions
Three-component coupling (3CC) of kojicacid, aldehyde and 1,3-dione has been achieved in the presence of 10 mol % InCl3 under solvent-free conditions to afford the corresponding dihydropyrano[3,2-b]chromenedione derivatives in good yields. This is the first example of the condensation of kojicacid, aldehyde and 1,3-diones to provide a novel series of kojicacid derivatives.
在无溶剂条件下,在10 mol%InCl 3的存在下,曲酸,醛和1,3-二酮的三组分偶联(3CC)已实现,从而得到相应的二氢吡喃并[3,2- b ] chromenedione衍生物良品率高。这是曲酸,醛和1,3-二酮缩合以提供一系列新的曲酸衍生物的第一个例子。
Nano-pistachio hull-OxTiCl4 − x: synthesis, characterization and application as an effective and novel nanocatalyst for one-pot synthesis of dihydropyrano[3,2-b]chromenedione derivatives
nano-pistachio hull-OxTiCl4 − x nanocatalyst was shown by a scanning electron microscope below 100 nm. The catalytic activity of the solid acid catalyst has been successfully examined in a one-pot, three-component condensation reaction of aromatic aldehydes, dimedone and kojicacid in refluxing ethanol to furnish dihydropyrano[3,2-b]chromendione derivatives. Consequently, pyran annulated heterocycles were obtained
A simple method was employed for the synthesis of dihydropyrano[3, 2‐b]chromenedionederivatives (4a‐o) in high yields by condensation of 5, 5‐dimethylcyclohexane‐1, 3‐dione(1), different aromatic aldehydes (2a‐o), and 5‐hydroxy‐2‐(hydroxymethyl)‐4H‐pyran‐4‐one(3), using meglumine as a stable and reusable catalyst. Meglumine, an amino sugar, was employed as an environmentally benign catalyst, due to
通过简单的方法,通过缩合5,5-二甲基环己烷-1,3-二酮(1),不同的芳族醛(2a )来高收率合成二氢吡喃并[3,2 - b ]铬二酮衍生物(4a-o)-o)和5-羟基-2-(羟甲基)-4 H-吡喃-4-酮(3),使用葡甲胺作为稳定且可重复使用的催化剂。葡甲胺(一种氨基糖)由于其出色的性能(例如便宜,可回收和可生物降解)而被用作对环境无害的催化剂。完善的方案使用低催化剂负载量和易于后处理的方法合成5-羟基-2-(羟甲基)-4 H吡喃-4-1衍生物。一项重要的资产是,在不造成任何重大损失的情况下,可以回收催化剂并将其用于扩展的合成步骤。这为克服可回收性问题提供了巨大的优势。我们合成的化合物通过IR,1 H,13 C NMR,质谱进行了分析,并通过1,1-二苯基-2-吡啶基肼基自由基(DPPH),过氧化氢(H 2 O 2)和硝酸评估了它们的抗氧化性能。氧化物(NO)清除方法。抗氧化剂活性表现