Succinimidinium hydrogensulfate ([H-Suc]HSO4) as a new, green and efficient ionic liquid catalyst for the synthesis of tetrahydrobenzimidazo[2,1-b]quinazolin-1(2H)-one, 1-(benzothiazolylamino)phenylmethyl-2-naphthol, 1, 8-dioxo-octahydroxanthene and bis(indolyl)methane derivatives
作者:Omid Goli-Jolodar、Farhad Shirini
DOI:10.1007/s13738-016-0822-1
日期:2016.6
In this work, succinimidinium hydrogensulfate ([H-Suc]HSO4), a newly reported Brönsted acidic ionic liquid, is used as an efficient and reusable catalyst in the synthesis of tetrahydrobenzimidazo[2,1-b]quinazolin-1(2H)-ones, 1-(benzothiazolylamino)phenylmethyl-2-naphthols, 1,8-dioxo-octahydroxanthenes and bis(indolyl)methanes. All reactions were performed during relatively short reaction times with
在这项工作中,新报道的布朗斯台德酸性离子液体硫酸氢琥珀酰亚胺([H-Suc] HSO 4)在合成四氢苯并咪唑并[ 2,1- b ]喹唑啉-1(2 H)中用作有效且可重复使用的催化剂。)-,1-(苯并噻唑基氨基)苯基甲基-2-萘酚,1,8-二氧-八氢氧杂蒽和双(吲哚基)甲烷。所有反应均在相对短的反应时间内进行,并具有优异的收率。通过IR,1 H NMR和13 C NMR光谱对产物的结构进行表征,并通过比较真实样品进行确认。
Facile and Efficient Synthesis of Tetrahydrobenzimidazo [2,1-<i>b</i>]Quinazolin-1(2<i>H</i>)-One Derivatives Using Brönsted Acidic Ionic Liquid Immobilized on Nanoporous Na<sup>+</sup>-Montmorillonite
In this work, an efficient and green procedure have been described for the synthesis of tetrahydrobenzimidazo[2,1-b]quinazolin-1(2H)-one derivatives using nanoporous sodium montmorillonite clay (Na+-MMT) modified with 1-methyl-3-(trimethoxysilylpropyl)-imidazolium hydrogen sulfate (Na+-MMT-[pmim]HSO4). The procedure gave the products in excellent yields in very short reaction times under solvent-free
Preparation of a new DABCO-based ionic liquid and investigation on its application in the synthesis of benzimidazoquinazolinone and pyrimido[4,5-b]-quinoline derivatives
In this article, we report the preparation of a new ionicliquid from the reaction of DABCO and sulfuric acid and its characterization using FT-IR, Mass and NMR spectroscopy. This ionicliquid is air- and water-stable and affordable. Afterward this reagent is used for the synthesis of benzimidazoquinazolinone and pyrimido[4,5-b]-quinoline derivatives as a catalyst. The results show the applicability
在本文中,我们报告了由DABCO与硫酸反应制备的新型离子液体,并使用FT-IR,质谱和NMR光谱对其进行了表征。这种离子液体对空气和水都是稳定的,并且价格适中。此后,该试剂用于合成苯并咪唑并喹唑啉酮和嘧啶并[4,5- b ]-喹啉衍生物作为催化剂。结果表明,所制备的试剂作为可重复使用的催化剂的适用性而不会损失其活性。该方法具有一些优点,例如易于制备催化剂,后处理步骤简单,反应时间短,产率高以及使用无毒且廉价的催化剂。
A simple and convenient synthesis of [1,2,4]triazolo/benzimidazolo quinazolinone and [1,2,4]triazolo[1,5-a]pyrimidine derivatives catalyzed by DABCO-based ionic liquids
2,4]triazolo/benzimidazolo quinazolinone and [1,2,4]triazolo[1,5-a]pyrimidine derivatives in the adequate procedures. These methods involve three-component reaction between aldehydes, β-diketones and 3-amino-1,2,4-triazole or 2-aminobenzimidazole in the presence of 1,4-disulfo-1,4-diazabicyclo[2.2.2]octane-1,4-diium chloride ([DABCO](SO3H)2(Cl)2) and 1,4-disulfo-1,4-diazabicyclo[2.2.2]octane-1,4-diium
基于DABCO的离子液体在适当的程序中用于制备[1,2,4]三唑/苯并咪唑并喹唑啉酮和[1,2,4]三唑并[1,5- a ]嘧啶衍生物。这些方法涉及在1,4-二磺基-1,4-二氮杂双环[2.2.2]辛烷存在下,醛,β-二酮与3-氨基-1,2,4-三唑或2-氨基苯并咪唑之间的三组分反应。-1,4-二氯氯化物([DABCO](SO 3 H)2(Cl)2)和1,4-二磺基-1,4-二氮杂双环[2.2.2]辛烷-1,4-二硫酸二氢盐([ DABCO](SO 3 H)2(HSO 4)2)作为可重复使用且经济的催化剂,可在100°C下使用。这些方法还通过消除溶剂显示出环保特性。没有通过这种方法制备任何副产物,并且通过简单的后处理程序分离产物。这些方法的其他显着优势是产率高,反应时间短,反应条件温和以及使用廉价的廉价材料。
Synthesis of Benzimidazolo[2,3-<i>b</i>]quinazolinone Derivatives via a One-pot Multicomponent Reaction Promoted by a Chitosan-based Composite Magnetic Nanocatalyst
作者:Ali Maleki、Morteza Aghaei、Nakisa Ghamari
DOI:10.1246/cl.141074
日期:2015.3.5
A practical and green approach for the one-pot multicomponent synthesis of tetraheterocyclic benzimidazolo[2,3-b]quinazolinones has been described via the condensation of 2-aminobenzimidazole or 2-aminobenzothiazole, dimedone, and various aldehydes using Fe3O4@chitosan as an environmentally benign and reusable nanocomposite catalyst in good to excellent yields.