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
A simple and efficient procedure for the synthesis of benzo[4,5]imidazo[1,2-α]pyrimidine and 2-amino-4-substituted-1,4-dihydrobenzo[4,5]imidazolo[1,2-α]pyrimidine-3-carbonitrile derivatives using poly(vinylpyrrolidonium) perchlorate [PVPH]ClO4} as a newly reported, modified polymeric catalyst is reported. Some of the advantages of this novel synthetic method are: easy preparation of the catalyst,
Silica sulfuric acid/ethylene glycol as an efficient catalyst for the synthesis of benzo[4,5]imidazo[1,2-<i>a</i>]pyrimidine-3-carbonitrile derivatives
作者:Wahid M. Basyouni、Samir Y. Abbas、Nagwa M. Abdelazeem、Khairy A. M. El-Bayouki、Mohamed Y. El-Kady
DOI:10.1080/00397911.2019.1652322
日期:2019.11.17
developed for the synthesis of new benzo[4,5]imidazo[1,2-a]pyrimidine-3-carbonitrile derivatives in excellent yields. The synthesis was achieved through the reaction of 2-aminobenzimidazole, aldehydes and active nitriles (malononitrle or ethyl cyanoacetae) in the presence of silica sulfuric acid/ethylene glycol. This protocol offers very short reaction times (in some cases, reaction times were reduced to five
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.