Sulfuric Acid Functionalized Silica-Coated Magnetic Nanoparticles: Preparation and Application in Synthesis of Mono-, Di- and Tri[bis(6-aminopyrimidinyl)methanes]
magnetic nanoparticles (SSA-MNPs) were prepared by a simple method and evaluated as efficient catalysts for the condensation reaction of 6-amino-1,3-dimethyluracil with mono-, di-, or trialdehydes to give the corresponding mono-, di- and tri[bis(6-aminopyrimidinyl)methanes]. The catalyst was simply recycled by the use of an external magnetic field and could be reused five times without significant loss
C-C bond cleavage: Metal-free-catalyzed reaction of Betti bases with various heterocycles under microwave irradiation
作者:Mohit L. Deb、B.-Shriya Saikia、Kongkona Borah、Pranjal K. Baruah
DOI:10.1080/00397911.2016.1239740
日期:2016.12.1
ABSTRACT The reaction of Betti bases with various heterocycles in the presence of p-toluenesulphonic acid (PTSA) under microwave irradiation gives bis(heterocycle)methanes through benzyl transfer. The reaction proceeds via the cleavage of C-N bond followed by C-C bond. The metal-free cleavage of C-C bond, which is in fact a C-dearylation, is rarely reported in the literature. GRAPHICAL ABSTRACT
A Clean, Highly Efficient and One-Pot Green Synthesis of Aryl/Alkyl/Heteroaryl-Substituted Bis(6-amino-1,3-dimethyluracil-5-yl)methanes in Water
作者:Subrata Das、Ashim Jyoti Thakur
DOI:10.1002/ejoc.201001581
日期:2011.4
A highlyefficient green synthesis of aryl/alkyl/heteroaryl-substituted bis(6-amino-1,3-dimethyluracil-5-yl)methanes by the condensation of 6-amino-1,3-dimethyluracil with aldehydes (aromatic, aliphatic and heterocyclic) in water at room temperature is described. No dehydrating agent, heat, catalyst, surfactant or additive was used. The structures of the compounds were established by spectroscopic
Ceric ammonium nitrate (CAN): an efficient and eco-friendly catalyst for the one-pot synthesis of alkyl/aryl/heteroaryl-substituted bis(6-aminouracil-5-yl)methanes at room temperature
作者:Goutam Brahmachari、Bubun Banerjee
DOI:10.1039/c5ra04723d
日期:——
practical method for the one-pot synthesis of biologically relevant alkyl/aryl/heteroaryl-substituted bis(6-aminouracil-5-yl)methane scaffolds (3a–3u) has been developed using ceric ammonium nitrate (CAN) as a commercially available and eco-friendly catalyst via pseudo three-component condensation reaction between aldehydes and 6-aminouracils in aqueous ethanol at roomtemperature. The salient features of
Preparation, characterization and utilization of a novel dicationic molten salt as catalyst for the synthesis of bis(6-amino-1,3-dimethyluracil-5-yl)methanes
firstly, preparation and characterization of a novel dicationic molten salt, namely N , N , N ′, N ′-tetramethylethylenediaminium bisulfate ([TMEDA][HSO4]2), by 1H NMR, 13C NMR, FT-IR, mass, thermogravimetry, derivative thermogravimetry and differential thermal analysis data have been reported. Thereafter, utilization of [TMEDA][HSO4]2 as a recyclable catalyst for the solvent-free synthesis of bis(6-amino-1
摘要 在本研究中,首先,通过1 H NMR,13 C NMR制备并表征了一种新型的专用熔融盐,即 N , N , N ′, N′- 四甲基乙二硫酸氢铵([TMEDA] [HSO 4 ] 2)。已经报道了FT-IR,质量,热重分析,微分热重分析和差热分析数据。之后,利用[TMEDA] [HSO 4 ] 2作为可循环利用的催化剂,用于通过6-氨基-1,3-二甲基尿嘧啶(2当量)和芳醛(1的反应)无溶剂合成双(6-氨基-1,3-二甲基尿嘧啶-5-基)甲烷eq。)。 图形摘要