One-Pot Three-Component Synthesis of 2,4,5-Triaryl-1H-imidazoles Using Mn2+ Complex of [7-Hydroxy-4-methyl-8-coumarinyl] Glycine as a Heterogeneous Catalyst
A highly efficient and simple synthesis of 2,4,5-trisubstituted imidazoles has been developed using highly reusable support‐free Mn2+complex of [7-hydroxy-4-methyl-8-coumarinyl] glycine as a heterogeneous catalyst via a one-potthree-component reaction of benzil, aldehydes and ammonium acetate as a nitrogen source. Moreover, this catalyst was characterized by various techniques such as field emission
Natural Bio-surfactant for Pseudomulticomponent Synthesis of 2-Aryl-1- aryl Methyl-1H-benzimidazoles
作者:Smita T. Morbale、Sachin K. Shinde、Shashikant A. Damate、Madhukar B. Deshmukh、Suresh S. Patil
DOI:10.2174/1570178614666170710115331
日期:2017.12.11
Green chemistry emphasizes the development of environmentally benign chemical processes
and technologies. Pseudo-multicomponent synthesis of 2-aryl-1-arylmethyl-1H-benzimidazoles
using o-phenylenediamine and aromatic aldehydes is carried out by Bronsted acid type bio-surfactant
as a catalyst. The green features of this method include the use of biodegradable catalyst obtained from
renewable resource i.e. Citrus Limonium extract as bio-surfactant type Bronsted acid, which provides a
micellar media for effective cyclocondensation. The critical micellar concentration (cmc) of biosurfactant
was determined by conductivity method and visualized by light microscopy measurement. Identity
of all pure compounds was ascertained on the basis of FT-IR, 1H NMR and 13C NMR spectroscopic
techniques.
In this study, we developed an instrumental hybrid catalytic system comprising cellulose fiber and volcanic pumice powder, which was applied as a suitable organic-inorganic hybrid catalyst for the synthesis of 2,4,5-triarylimidazole derivatives. High reaction yields (97%) were obtained in short reaction times (20 min) using this catalytic system. In physical terms, the high porosity of pumice provides an extremely high active surface area for electronic interactions among the components. Moreover, the most distinctive properties of this catalytic system are high biodegradability, simple separation of the catalyst, and good reusability. The natural pumice can be recovered easily using an external magnet and reused with no significant decline in the catalytic activity. The structural characteristics of this efficient catalytic system were assessed using various analytical methods.
Simple practical method for synthesis of trisubstituted imidazoles: an efficient copper catalyzed multicomponent reaction
作者:Vikas D. Kadu、Ganesh A. Mali、Siddheshwar P. Khadul、Gokul J. Kothe
DOI:10.1039/d1ra01767e
日期:——
A rapid practical process has been developed for synthesis of 2,4,5-trisubstituted-imidazoles in excellent yields up to 95% from readily available starting materials. In this CuI catalyzed synthesis, trisubstituted imidazoles were afforded in short reaction times, wherein the substrate scope is well explored with benzoin as well as benzil reacting with different aldehydes in the presence of ammonium
已经开发出一种快速实用的方法,用于从容易获得的起始材料合成 2,4,5-三取代咪唑,收率高达 95%。在这种 CuI 催化合成中,在很短的反应时间内得到了三取代咪唑,其中在乙酸铵作为氮源存在下,安息香以及苯偶酰与不同的醛反应,很好地探索了底物范围。