Introduction of a novel dicationic Brönsted acidic ionic liquid based on pyrazine and its application in the synthesis of xanthenediones and 3, 4-dihydropyrimidin-2(1H)-ones under solvent-free conditions
作者:Seyyed Erfan Sadati Sorkhi、Mohammad M. Hashemi、Ali Ezabadi
DOI:10.1007/s11164-020-04089-9
日期:2020.4
acidic ionic liquid based on pyrazine has been prepared and characterized by FTIR, 1HNMR, 13C NMR, MS, thermal gravimetric and differential thermal gravimetric analysis and also Hammett acidity function. The prepared dicationic ionic liquid is found to be an efficient and reusable catalyst for the synthesis of xanthenediones and 3,4-dihydropyrimidin-2(1H)-ones under solvent-free conditions. The merits
制备了一种新型的吡嗪类布朗斯台德酸性离子液体,并通过FTIR,1 H NMR,13 C NMR,MS,热重分析和差示热重分析以及Hammett酸度函数进行了表征。发现所制备的阳离子型离子液体是在无溶剂条件下用于合成黄二酮和3,4-二氢嘧啶-2(1 H)-one的有效且可重复使用的催化剂。所开发方法的优点包括离子液体的新颖性,离子液体的易于制备,易于后处理,催化剂的可重复使用性,高收率,短的反应时间以及不存在有毒的有机溶剂。
A novel polymeric catalyst for the one-pot synthesis of xanthene derivatives under solvent-free conditions
simple, efficient, and environmentally benign route was developed for the preparation of 14-aryl or alkyl-14H-dibenzo[a,j]xanthene, 1,8-dioxo-octahydroxanthene and 12-aryl—8,9,10,12-tetrahydrobenzo[a]xanthene-11-ones from condensation of various aldehydes with (i) β-naphthol, (ii) cyclic 1,3-dicarbonyl compounds and (iii) β-naphthol and cyclic 1,3-dicarbonyl compounds, using novel polymeric catalyst [poly(AMPS-co-AA)]
Rapid, efficient and solvent-free synthesis of (un)symmetrical xanthenes catalyzed by recyclable sulfated polyborate
作者:Manisha S. Patil、Amey V. Palav、Chetan K. Khatri、Ganesh U. Chaturbhuj
DOI:10.1016/j.tetlet.2017.06.027
日期:2017.7
straightforward approach to the synthesis of 1,8-dioxo-octahydroxanthenes, 14-phenyl-14H-dibenzo[a,j]xanthene and tetrahydrobenzoxanthene-11-ones under solvent-free conditions usingsulfated polyborate as a highly efficientcatalyst. The procedure offers several advantages including cleaner reaction profile, mild reaction condition, economic, recyclable and environmentally benign catalyst, high yields, simple
4-Imidazol-1-yl-butane-1-sulfonic acid or a novel liquid salt? The NMR analysis and dual solvent-catalytic efficiency for one-pot synthesis of xanthenes
structure of the product was investigated by the NMRanalysis in CD3OD and DMSO‑d6. This work demonstrated that 4-imidazol-1-yl-butane-1-sulfonic acid could not be obtained through the above reaction and the mixture of zwitterionic (I) and ionic (II) structure is produced. The structure of the liquid salt (I + II) was characterized and analyzed by 2D NMR. Then, the dual solvent-catalytic efficiency of
Tungstophosphoric acid nanoparticles supported on polyamic acid: A mild and recoverable heterogeneous catalyst for the selective synthesis of mono and bulky bis(1,8-dioxooctahydroxanthene)s under solvent-free conditions
作者:Masoud Nasr-Esfahani、Zahra Rafiee、Hassan Kashi
DOI:10.1080/10426507.2015.1100185
日期:2016.5.3
8-dioxooctahdroxanthene) were selectively synthesized using tungstophosphoricacid nanoparticles supported on polyamic acid (TPA/PAA) as a new catalyst in solvent-freeconditions. The high purity products were isolated and catalyst was easily separated in simple work-up and was recycled several times without loss of reactivity under the described reaction conditions. The reaction is characterized by short reaction