Guanidinium-based sulfonic acid as a new Brønsted acid organocatalyst has been synthesized, characterized, and applied for the synthesis of 3,4-dihydroquinoxalin-2-amine, 1,6-dihydropyrazine-2,3-dicarbonitrile, triazolo[1,2-a]indazole-trione, and spiro triazolo[1,2-a]indazole-tetraone derivatives in an aqueous medium. The catalytic system, reported here, possesses the advantages of both homogeneous and heterogeneous catalysts and can be repetitively used in water.
A novel catalytic one-pot three-component reaction of aldehydes, o-phenylenediamine derivatives and isocyanides for synthesis of 3,4-dihydroquinoxalin-2-amine derivatives in the presence of zirconium tetrachloride
作者:Seyed Ali Jehbez、Hamid Reza Safaei
DOI:10.1007/s13738-018-1301-7
日期:2018.5
synthesis of biologically interesting 3,4-dihydroquinoxalin-2-amine derivatives through a three-component condensation reaction of o-phenylenediamines, carbonyl compounds and isocyanides in ethanol at room temperature is described. In this work, unlike the other methods, aldehydes reacted as well as ketones in the presence of 10 mol% of zirconium tetrachloride as catalyst to afford good to excellent yields
摘要描述了一种简单有效的一锅法,用于在室温下通过邻苯二胺,羰基化合物和异氰化物在乙醇中的三组分缩合反应合成生物学上令人感兴趣的3,4-二氢喹喔啉-2-胺衍生物。在这项工作中,与其他方法不同,在10摩尔%的四氯化锆作为催化剂的存在下,醛类和酮类也发生了反应,从而提供了良好的产品收率。该方法由于其对环境有益的特性,高收率,易于处理以及对醛和酮的可靠性而具有重要的价值。通过IR,1 H NMR,13 C NMR和元素分析系统地表征了新合成的化合物。 图形概要醛,邻苯二胺衍生物和异氰酸酯的新型催化一锅三组分反应,用于在四氯化锆存在下合成3,4-二氢喹喔啉-2-胺衍生物 。
Eco-friendly synthesis of 3,4-dihydroquinoxalin-2-amine, diazepine-tetrazole and benzodiazepine-2-carboxamide derivatives with the aid of MCM-48/H<sub>5</sub>
PW<sub>10</sub>
V<sub>2</sub>
O<sub>40</sub>
efficient, eco‐friendly and highly recyclable catalyst for the one‐pot and multicomponentsynthesis of 3,4‐dihydroquinoxalin‐2‐amine, diazepine‐tetrazole and benzodiazepine‐2‐carboxamide derivatives in aqueous media and at room temperature with high yields in short reaction times (40–60 min). The recoverable catalyst was easily recycled at least five times without any loss of catalytic activity. The
生产了由MCM-48 / H 5 PW 10 V 2 O 40组成的非均质材料,并将其用作高效,生态友好且高度可回收的催化剂,用于3,4-二氢喹喔啉-2-胺的一锅多组分合成,二氮杂-四唑和苯并二氮杂-2-羧酰胺衍生物在水性介质中和室温下以高收率在较短的反应时间(40-60分钟)内产生。可回收的催化剂易于循环至少五次,而没有任何催化活性的损失。使用1 H NMR和13 C NMR光谱确认获得的产物的结构。
Wool-SO3H and nano-Fe3O4@wool as two green and natural-based renewable catalysts in one-pot isocyanide-based multicomponent reactions
Natural wool sulfonic acid (wool-SO3H) and wool-supported Fe3O4 nanoparticles (nano-Fe3O4@wool) with highly loaded Fe3O4 nanoparticles were simply synthesized and characterized by flame atomic absorption spectroscopy, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. The successful synthesis of 3,4-dihydroquinoxalin-2-amine, 1,6-dihydropyrazine-2,3-dicarbonitrile, (cyanophenylamino)acetamide, tetrahydro-1H-1,5-benzodiazepine-2-carboxamide, and 4,5,6,7-tetrahydro-1H-1,4-diazepine-5-carboxamide derivatives shows that wool-SO3H and Fe3O4@wool nanocomposite have high catalytic activity and can be repetitively used as two biodegradable catalysts.
Cellulose-SO3H as a biodegradable solid acid catalyzed one-pot three-component Ugi reaction: Synthesis of α-amino amide, 3,4-dihydroquinoxalin-2-amine, 4H-benzo[b][1,4]thiazin-2-amine and 1,6-dihydropyrazine-2,3-dicarbonitrile derivatives
A variety of amines has become utilized in the three-compound Ugi reaction and synthesis of 3,4-dihydroquinoxalin-2-amine, 4H-benzo[b][1,4]thiazin-2-amine and 1,6-dihydropyrazine-2,3-dicarbonitrile derivatives in the presence of cellulose sulfuric acid as a biopolymer solid acid catalyst in ethanol at room temperature. (c) 2012 Elsevier B.V. All rights reserved.