three-component synthesis of 2-amino-4-substituted-1,4-dihydrobenzo[4,5]imidazolo[1,2-a]pyrimidine-3-carbonitrile derivatives by the reaction between various aldehydes with 2-aminobenzimidazole and malononitrile with an excellent output and in low-response period was studied in the presence of Ag–TiO2 nanocomposite as an efficient and recyclable catalyst undersolvent-freeconditions at 60 °C. The results
摘要通过各种醛与2-的反应,一锅三组分合成2-氨基-4-取代的1,4-二氢苯并[4,5]咪唑并[1,2 - a ]嘧啶-3-腈在无溶剂条件下于60°C的条件下,以Ag-TiO 2纳米复合材料作为有效和可回收的催化剂,研究了氨基苯并咪唑和丙二腈具有优异的产量和低响应时间。结果表明,所需产物的分离可通过简单过滤实现,并且Ag-TiO 2纳米复合材料可重复使用并连续重复使用。 图形摘要
Ferrocene-Functionalized Dithiocarbamate Zinc(II) Complexes as Efficient Bifunctional Catalysts for the One-Pot Synthesis of Chromene and Imidazopyrimidine Derivatives via Knoevenagel Condensation Reaction
作者:Anamika、Chote Lal Yadav、Michael G. B. Drew、Kamlesh Kumar、Nanhai Singh
DOI:10.1021/acs.inorgchem.1c00162
日期:2021.5.3
analyses, IR, UV–vis, and 1H and 13C1H} NMR spectroscopic techniques. The solid-statestructures of complexes 1, 3, and 4 have been determined by single-crystal X-ray crystallography as well as powder X-ray diffraction. Single-crystal X-ray crystallography revealed a monomeric structure for complex 1 but 1Dpolymericstructures for complexes 3 and 4. In all complexes, dithiocarbamate ligands are bonded
p-Toluenesulfonic acid-catalyzed one-pot synthesis of 2-amino-4-substituted-1,4-dihydrobenzo[4,5]imidazolo[1,2-a]pyrimidine-3-carbonitriles under neat conditions
Résumé A simple, efficient, and green procedure for the preparation of 2-amino-4-substituted-1,4-dihydrobenzolo[4,5]imidazolo[1,2-a]pyrimidine-3-carbonitriles has been developed by multi-component condensation of 2-aminobenzimidazole with aldehydes and malononitrile in the presence of a catalytic amount of p-toluenesulfonic acid, affording excellent yields under neat conditions. The protocol avoids the use of expensive catalysts, toxic solvents, and chromatographic separation. We believe that this new environmentally metal-free procedure, combined to a solvent-free reaction, would be of importance in the search of green laboratory-scale synthesis.
Starch functionalized magnetite nanoparticles: A green, biocatalyst for one-pot multicomponent synthesis of imidazopyrimidine derivatives in aqueous medium under ultrasound irradiation
efficient and environmentally friendly one-pot multicomponent synthesis of biologically fascinating imidazopyrimidine derivatives by the reaction of aromatic aldehydes, active methylene compounds and 2-aminobenzimidazole under ultrasonic irradiation have been developed. The reaction is catalyzed by starch functionalized magnetite nanoparticles (s-Fe3O4). The salient features of the present methodology
Facile and efficient synthesis of pyrimido[1,2-a]benzimidazole and tetrahydrobenzimidazo[2,1-b]quinazolin-1(2H)-one derivatives using Brönsted acidic ionic liquid supported on rice husk ash (RHA-[pmim]HSO4)
In this work, a green and efficient procedure has been reported for the synthesis of pyrimido[1,2-a]benzimidazole and tetrahydrobenzimidazo[2,1-b]quinazolin-1(2H)-onederivatives using Brönsted acidic ionicliquid supported on rice husk ash (RHA-[pmim]HSO4) as the catalyst. These reactions were performed at 100 °C under solvent-free conditions with high yields in very short reaction times.
在这项工作中,已经报道了使用布朗斯台德酸性离子液体载体合成嘧啶基[1,2- a ]苯并咪唑和四氢苯并咪唑并[ 2,1- b ]喹唑啉-1(2 H)-one衍生物的绿色高效方法。以稻壳灰(RHA- [pmim] HSO 4)为催化剂。这些反应是在100°C无溶剂条件下以极短的反应时间高收率进行的。