Supramolecular catalysis by β-cyclodextrin for the synthesis of kojic acid derivatives in water
作者:Evgeny A. Kataev、Mittapalli Ramana Reddy、Gangarpu Niranjan Reddy、Vemulapati Hanuman Reddy、Cirandur Suresh Reddy、Basi V. Subba Reddy
DOI:10.1039/c5nj01902h
日期:——
An efficient and green method has been developed for the synthesis of kojic acid derivatives by employing 20 mol% β-cyclodextrin in aqueous media.
已开发出一种高效且环保的方法,通过在水介质中使用20 mol% β-环糊精合成曲酸衍生物。
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