Mild and Highly Efficient Method for the Synthesis of 2-Arylbenzimidazoles and 2-Arylbenzothiazoles
作者:Kiumars Bahrami、M. Mehdi Khodaei、Fardin Naali
DOI:10.1021/jo8010232
日期:2008.9.1
A new, convenient method for the syntheses of 2-substituted benzimidazole and benzothizole is described. Short reaction times, large-scale synthesis, easy and quick isolation of the products, excellent chemoselectivity, and excellent yields are the main advantages of this procedure.
A simple and efficient procedure for the synthesis of substituted benzimidazoles through a one-pot condensation of o-phenylenediamines with aryl aldehydes in the presence of H2O2/HCl system in acetonitrile at room temperature is described. Short reaction time, large-scale synthesis, easy and quick isolation of the products, and excellent yields are the main advantages of this procedure.
Synthetic Utility of Catalytic Fe(III)/Fe(II) Redox Cycling Towards Fused Heterocycles: A Facile Access to Substituted Benzimidazole, Bisbenzimidazole and Imidazopyridine Derivatives
作者:Malvinder P. Singh、Sanjita Sasmal、Wei Lu、Manashi N. Chatterjee
DOI:10.1055/s-2000-7111
日期:——
A catalytic Fe(III)/Fe(II) redox cycling approach has been examined and applied towards synthesis of a wide range of benzimidazole, bis-benzimidazole and imidazopyridine derivatives from oxidative coupling of aromatic ortho-diamines with aromatic as well as heterocyclic aldehydes bearing different types of substituents. This versatile and convenient method has further proven to be particularly useful
PEG-mediated catalyst-free expeditious synthesis of 2-substituted benzimidazoles and bis-benzimidazoles under solvent-less conditions
作者:Chhanda Mukhopadhyay、Pradip Kumar Tapaswi
DOI:10.1016/j.tetlet.2008.08.041
日期:2008.10
A wide variety of 2-substituted benzimidazoles and bis-benzimidazoles were synthesized in high yields by PEG-mediated catalyst-free synthesis under solvent-less conditions. The products were directly recrystallized from hot methanol. The reaction occurred giving excellent yields with low as well as high molecular weight PEGs.
One-pot synthesis of 2-substituted benzimidazoles catalyzed by anhydrous FePO4
作者:Farahnaz K. Behbahani、Parisa Ziaei
DOI:10.1007/s10593-012-1093-0
日期:2012.10
Anhydrous FePO4 has been employed as a catalyst for efficient synthesis of 2-substituted benzimidazoles. Simple and convenient procedure, easy purification and shorter reaction time are the advantages of this method, resulting in several known and three new compounds.