A Convenient Method for the Preparation of 2,4,5-triaryl Imidazoles Using Barium Chloride Dispersed on Silica Gel Nanoparticles (BaCl2-nano SiO2) as Heterogeneous Reusable Catalyst
A simple and eco-friendly procedure for the synthesis of 2,4,5-triaryl imidazoles by using Barium chloride
dispersed on silica gel nanoparticles (BaCl2-nano SiO2) as heterogeneous reusable catalyst in high yield under thermal
conditions has been described.
Eco-friendly synthesis of various tri-substituted imidazole derivatives by using a novel functionalized NCP@SiO3PrNHPrSiO3TiO2 under solvent-free conditions
catalytic activity of NCP@SiO3PrNHPrSiO3TiO2 was also employed for the synthesis of tri-substituted imidazoles via three-component condensation reactions of aldehydes, benzyl and NH4OAc undersolvent-freeconditions. This synthesis features environmentally benign, short reaction time, efficiency, and feasibility of large-scale synthesis compared to classical reactions.
在本研究中,使用各种分析技术设计、合成并充分表征了一种新型NCP@SiO 3 PrNHPrSiO 3 TiO 2纳米催化剂:XRD 、FT-IR、SEM、EDS、BET 和 TG 分析。NCP@SiO 3 PrNHPrSiO 3 TiO 2的催化活性也被用于在无溶剂条件下通过醛、苄基和NH 4 OAc的三组分缩合反应合成三取代咪唑。与经典反应相比,该合成具有环境友好、反应时间短、效率高以及大规模合成的可行性等特点。
Synthesis and analgesic activity of some 1-benzyl-2-substituted-4,5-diphenyl-1H-imidazole derivatives
In this study, derivatives of 1-benzyl-2-substituted-4,5-diphenyl-1H-imidazole were synthesized and their analgesic activity assayed in two tests. 1,2,4,5-Tetrasubstituted imidazole compounds were obtained by the treatment of purified imidazole compounds with benzyl chloride in the presence of sodium hydride. The structure elucidation of the compounds was performed by IR, H-1-NMR and mass spectroscopic data and elemental analysis results. Generally the prepared compound exhibited only moderate analgesic activity in mice at the dose of 100 mg/kg i.p.; however, a few of them exhibited good activity, almost equivalent to that of morphine at 1 mg/kg i.p. was observed. At the above dosage, no toxicity was observed for all compounds. (C) 2001 Elsevier Science S.A. All rights reserved.