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。
Green, effective and chromatography free synthesis of benzoimidazo[1,2-a]pyrimidine and tetrahydrobenzo [4,5]imidazo [1,2-d]quinazolin-1(2H)-one and their pyrazolyl moiety using Fe3O4@SiO2@ -proline reusable catalyst in aqueous media
L-proline-functionalized silica-coated Fe3O4 nanoparticle was synthesized and characterized using Fourier Transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), thermogravimetric analysis (TGA), Zeta potential and a vibrating sample magnetometer (VSM). The Fe3O4@SiO2@L-proline nanoparticles in aqeous media have been used as a green avenue for the mild and efficient multicomponent synthesis of new derivatives of benzoimidazo[1,2-a]pyrimidines and tetrahydrobenzo [4,5] imidazo-[1,2-d] quinazolin-1(2H)-ones in excellent yields. Furthermore, the recovery and reuse of the catalyst was demonstrated 10 times without a detectible loss in activity. Eco-friendliness, high purity of the desired products, short reaction time and easy workup can be mentioned as the other advantages of this method. (c) 2019 Published by Elsevier B.V.
Sulfonic acid-supported vanillin/bis indolylmethane-functionalized Fe
<sub>3</sub>
O
<sub>4</sub>
@SiO
<sub>2</sub>
-propyl NPs as green, effective, and magnetically recoverable catalysts for the synthesis of imidazoquinazolines and thiazoquinazolines