Synthesis of organosilyl compounds-containing 1,2,4,5-tetraaryl imidazoles sonocatalyzed by M/SAPO-34 (M = Fe, Co, Mn, and Cu) nanostructures
作者:Kazem D. Safa、Maryam Allahvirdinesbat、Hassan Namazi、Parvaneh Nakhostin Panahi
DOI:10.1016/j.crci.2015.04.008
日期:2015.8
Résumé The one-step synthesis of silylated 1,2,4,5-tetraaryl imidazoles by use of a series of M/SAPO-34 (M: Fe, Co, Mn, and Cu) nanocatalysts and subsequent silylation reactions is described. Cu/SAPO-34 catalyst has the highest activity in improving the efficiency of the heterogeneous cyclo-condensation of an aldehyde, benzil, ammonium acetate and a primary aromatic amine in water under ultrasonic irradiation. Some of imidazole derivatives are studied with a view to the synthesis of a series of new, multi-substituted imidazoles containing organosilyl groups including carbosilanes (Si–C) and silyl ethers (Si–O). Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.docx
gel (P2O5/SiO2) has been used as an efficient and reusable catalyst for the one‐pot pseudo four‐componentsynthesis of 2,4,5‐trisubstituted imidazoles from benzil or benzoin, aldehydes, and ammonium acetate. It was also used for four‐component preparation of 1,2,4,5‐tetrasubstitutedimidazoles from benzil or benzoin, aldehydes, primary amine, and ammonium acetate under thermal solvent‐free conditions
负载在硅胶(P 2 O 5 / SiO 2)上的五氧化二磷已被用作一种高效且可重复使用的催化剂,用于由苯甲腈或安息香,醛,和醋酸铵。它也可在无热溶剂的条件下用于由苄基或安息香,醛,伯胺和乙酸铵四组分制备1,2,4,5-四取代的咪唑。这种新方法的显着特征是高转化率,更清洁的反应,简单的实验和后处理程序,并且催化剂可以轻松地从反应混合物中分离出来并重复使用几次,而不会损失其活性。
Synthesis of highly substituted imidazoles using Brønsted acidic ionic liquid, triphenyl(propyl-3-sulphonyl)phosphonium toluenesulfonate, as teusable catalyst
作者:H. R. Shaterian、M. Ranjbar、K. Azizi
DOI:10.1007/bf03246570
日期:2011.12
Brønsted acidic ionicliquid, triphenyl(propyl-3-sulphonyl)phosphonium toluenesulfonate, has been used as an efficient and reusable catalyst for the one-potsynthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstitutedimidazoles under solvent-free conditions in excellent yields.
One-pot synthesis of 2,4,5-tri-substituted and 1,2,4,5-tetra-substituted imidazoles catalyzed by poly(4-vinylpyridinium tribromide) (P.V.P.Br3) or citric acid
An efficient, one-pot method for preparation of tri and tetra-substituted imidazoles by condensation of benzil, aldehydes, and ammonium acetate or primary amine in the presence of a catalytic amount of citric acid or poly(4-vinylpyridinium tribromide) (P.V.P.Br3) under solvent-free conditions is reported. The remarkable advantages of this method are the inexpensive green catalyst, mild reaction conditions, simple procedures, and excellent yields of products. .
Magnetic nanoparticle-supported sulfonic acid as a green catalyst for the one-pot synthesis of 2,4,5-trisubstituted imidazoles and 1,2,4,5-tetrasubstituted imidazoles under solvent-free conditions
作者:Mahnaz Sakhdari、Ali Amoozadeh、Eskandar Kolvari
DOI:10.1515/hc-2020-0125
日期:2021.10.4
(γ-Fe2O3-SO3H) is used as an efficient catalyst in the synthesis of 2,4,5-trisubstituted imidazoles and 1,2,4,5-tetrasubstitutedimidazoles in a short time (40–70 min for trisubstituted imidazoles and 30–40 min for tetrasubstituted imidazoles) and high-purity products were obtained (92–98% for trisubstituted imidazoles and 94–98% for tetrasubstituted imidazoles) in simple multicomponent reactions. The structure