Efficient and Expeditious Synthesis of Pyrano-pyrimidines, Multi-substituted γ-Pyrans, and Their Antioxidant Activity
作者:Khairy A. M. El-Bayouki、Wahid M. Basyouni、Tamer K. Khatab、Fakhry A. El-Basyoni、Ahmed R. Hamed、Eslam A. Mostafa
DOI:10.1002/jhet.2019
日期:2014.1
An efficient, expeditious catalytic route for the synthesis of ethyl 6‐amino‐5‐cyano‐2‐methyl‐4‐aryl‐4H‐pyran‐3‐carboxylates 2 was achieved via a three‐component, one‐potreaction of malononitrile, ethyl acetoacetate, and various aromatic aldehydes in water as a solvent at room temperature. The key advantages are excellent yield, reaction time, and inexpensive catalyst. Also, cyclization of 4H‐pyrans
通过三组分单锅丙二腈反应,实现了一种高效,快速的催化路线,用于合成乙基6-氨基-5-氰基-2-甲基-4-甲基-4-芳基-4 H-吡喃-3-羧酸酯2室温下,以水为溶剂,乙酰乙酸乙酯和各种芳香醛作为溶剂。关键优势是优异的收率,反应时间和廉价的催化剂。此外,还描述了在乙酸酐存在下使用二氧化硅硫酸将4 H-吡喃2 2环化为相应的4 H-吡喃并[2,3- d ]嘧啶3。一些合成的化合物表现出有希望的抗氧化活性。
Green synthesis of nano-titania (TiO2 NPs) utilizing aqueous Eucalyptus globulus leaf extract: applications in the synthesis of 4H-pyran derivatives
We have presented the green synthesis and characterization of nano-titania (TiO2 NPs) by using Eucalyptus globulus leaf aqueous extract in a greener approach leading to their utilization as a catalyst in one-pot, three-component A3 coupling reactions. The composition of the as-prepared TiO2 NPs were confirmed by various analytical and spectroscopic techniques such as powder X-ray diffraction, scanning
我们展示了纳米二氧化钛 (TiO 2 NPs)的绿色合成和表征,通过以更环保的方式使用蓝桉叶水提取物,从而将其用作一锅三组分 A 3偶联反应的催化剂。通过各种分析和光谱技术,如粉末 X 射线衍射、扫描电子显微镜、透射电子显微镜、傅里叶变换红外光谱、热重分析、动态光散射分析和比表面积确认了所制备的 TiO 2 NPs的组成。通过Brunauer-Emmett-Teller分析测量。二氧化钛2 NPs 表现出平均粒径为 12 nm 的纯锐钛矿相结构。