ionic compound named 2,2′-bipyridinium dihydrogen phosphate was synthesized by addition of phosphoric acid to a solution of 2,2′-Bipyridine in dichloromethane. After the characterization using FT-IR, mass, 1H, 13C and 31P NMR techniques, it was used as a Bronsted dicationic acidic catalyst for the promotion of the synthesis of 2-arylidene malononitrile and 5-arylidene barbituric acidderivatives via
通过将磷酸添加到2,2'-联吡啶在二氯甲烷中的溶液中,合成了名为2,2'-联吡啶二磷酸二氢的基于2,2'-联吡啶的离子化合物。在使用FT-IR,质谱,1 H,13 C和31 P NMR技术进行表征后,将其用作布朗斯台克双阳离子酸性催化剂,以促进通过Knoevenagel合成2芳基丙二腈和5芳基巴比妥酸衍生物。在水中发生缩合反应。该方法的一些优点是在高反应速率和产率下利用容易制备的,成本有效的和生态友好的有机盐作为催化剂,简单和快速的后处理以及可接受的催化剂可重复使用性。
2-Phenyl-2,3-dihydrobenzo[d]thiazole: A Mild, Efficient, and Highly Active in situ Generated Chemoselective Reducing Agent for the One-Pot Synthesis of 5-Monoalkylbarbiturates in Water
作者:Dibakar Deka、Subarna Kalita
DOI:10.1055/s-0036-1591725
日期:2018.3
protocol for the one-pot synthesis of 5-monoalkylbarbiturates from barbituric acids and aldehydes using the in situ generated chemoselectivereducingagent 2-phenyl-2,3-dihydrobenzo[ d ]thiazole from 2-aminothiophenol and benzaldehyde is described. The notable advantages of the protocol are operational simplicity, mild reaction conditions, high yield, short reaction time, and simple workup and purification
Reaction of 6-aminouracils with aldehydes in water as both solvent and reactant under FeCl<sub>3</sub>·6H<sub>2</sub>O catalysis: towards 5-alkyl/arylidenebarbituric acids
5-Alkyl/arylidenebarbituric acids were efficiently synthesized through an FeCl3·6H2O catalyzed domino reaction of 6-aminouracils, water and aldehydes with water serving a dual role as both solvent and reactant, under benign conditions.
The introduction of two new imidazole-based bis-dicationic Brönsted acidic ionic liquids and comparison of their catalytic activity in the synthesis of barbituric acid derivatives
sulfate and bis-imidazolium perchlorate as two new bis-dicationic Brönsted acidic ionic liquids based on imidazole is reported. After characterization by FT-IR, mass and NMR spectroscopy and pH titration, the applicability of these reagents is studied in the promotion of the synthesis of 5-arylidene barbituricacids and pyrano[2,3-d] pyrimidinone derivatives. These methods possess some advantages such
在本文中,报道了制备双咪唑硫酸氢盐和双咪唑高氯酸盐作为两种新的基于咪唑的双阳离子布朗斯台德酸性离子液体。通过FT-IR,质谱,NMR光谱和pH滴定法进行表征后,研究了这些试剂在促进5-亚芳基巴比妥酸和吡喃并[2,3- d ]嘧啶酮衍生物的合成中的适用性。这些方法具有一些优点,例如易于制备催化剂,简单的后处理步骤,短的反应时间,优异的产率以及在反应的所有步骤中使用非有机溶剂以及催化剂的良好可重复使用性。
A study on the physical properties of low melting mixtures and their use as catalysts/solvent in the synthesis of barbiturates
作者:Letcy Vincent Theresa、Govindan Avudaiappan、Machingal Shaibuna、Kottayil Hiba、Krishnapillai Sreekumar
DOI:10.1002/jhet.4315
日期:2021.9
In recent years, deepeutecticsolvents have become attractive due to their interesting characteristics such as, physicochemical properties, low cost of components, easiness to prepare, low toxicity, bio-renewability, and biodegradability. In order to make the deepeutectic mixture more cost-effective and renewable, carbohydrate derivatives were linked with deepeutectic mixtures, since, carbohydrates