The preparation of pharmaceutically active 2-amino-4H-chromene derivatives has been achieved using a nano powder of natural clinoptilolite (CP) zeolite. A wide range of these worthy structures having diverse substituents on the 4H-chromene ring were efficiently synthesized via the reaction of an aromatic aldehyde and variety of enolizable C–H activated acidic compounds. Nano sized natural clinoptilolite
One‐pot synthesis of 2‐amino‐4,8‐dihydropyrano[3,2‐b]pyranes and pyridopyrimidines under mild conditions
作者:Fatemeh Rigi、Hamid Reza Shaterian
DOI:10.1002/jccs.201800048
日期:2019.4
was applied for the one‐pot, three‐component synthesis of 2‐amino‐4,8‐dihydropyrano[3,2‐b]pyrane‐3‐carbonitriles and pyridopyrimidines, under solvent‐free conditions. The reaction was carried out at room temperature, and pure products were obtained in high yields and short reaction times (3–7 min). This work introduced an environmentally benign procedure for the synthesis of these classes of biological
Synthesis, characterization, and application of Cu<sub>2</sub>O and NiO nanoparticles supported on natural nanozeolite clinoptilolite as a heterogeneous catalyst for the synthesis of pyrano[3,2-b]pyrans and pyrano[3,2-c]pyridones
作者:Seyed Meysam Baghbanian
DOI:10.1039/c4ra10537k
日期:——
In this research, Cu2O and NiO nanoparticles supported on natural nanozeolite clinoptilolite (CP) was found to be a recoverable catalyst system for synthesis of pyrano-[3,2-c]pyridone and pyrano[3,2-b]pyran derivatives in aqueous media. The nanocatalysts were characterized by various techniques such as XRD, BET, SEM, TEM, TEM-EDS, and XPS analyses. TEM study reveals that the Cu2O and NiO nanoparticles
在这项研究中,发现负载在天然纳米沸石斜发沸石(CP)上的Cu 2 O和NiO纳米颗粒是可合成吡喃并[3,2- c ]吡啶酮和吡喃并[3,2- b ]吡喃衍生物的催化剂体系。在水性介质中。纳米催化剂通过各种技术进行表征,例如XRD,BET,SEM,TEM,TEM-EDS和XPS分析。TEM研究表明,Cu 2 O和NiO纳米颗粒的粒径小于10 nm。XRD和XPS表征表明存在Cu 2形式天然纳米沸石CP表面的O或NiO。催化剂的容易回收和产物的高产率使该方案具有吸引力和经济性。此外,纳米催化剂可以循环使用几次,而不会显着降低其催化活性。
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