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.
A simple and efficient procedure for the synthesis of benzimidazoles using air as the oxidant
作者:Songnian Lin、Lihu Yang
DOI:10.1016/j.tetlet.2005.04.101
日期:2005.6
Direct one-step synthesis of various benzimidazoles from phenylenediamines and aldehydes is described using air as the oxidant. The salient features of this method include a simpleprocedure, mild conditions, no coupling agents or commercial oxidants/additives used, no waste produced (only by-product being water), easy purification, and high generality.
A simple and efficient procedure for the synthesis of benzimidazoles using trichloroisocyanuric acid (TCCA) as the oxidant
作者:Mohammad A. Bigdeli、Hamideh Dostmohammadi、Firouzeh Nemati、Gholam Hossein Mahdavinia
DOI:10.1002/jhet.5570450443
日期:2008.7
A Direct one step synthesis of various benzimidazoles from 3,4-diaminotoluene and benzaldehydes is described usingTCCA as the oxidant. The salient features of this method include simpleprocedure, mild condition, no waste products, easy separation, low reaction times and generality.
Zn<sub>3</sub>(BTC)<sub>2</sub>as a Highly Efficient Reusable Catalyst for the Synthesis of 2-Aryl-1<i>H</i>-Benzimidazole
作者:Sami Sajjadifar、Zeinab Arzehgar、Azadeh Ghayuri
DOI:10.1002/jccs.201700266
日期:2018.2
Zn3(BTC)2 metal‐organic frameworks as recyclable and heterogeneous catalysts were effectively used to catalyze the synthesis of benzimidazole derivatives from o‐phenylendiamine and aldehydes in ethanol. This method provides 2‐aryl‐1H‐benzimidazoles in good to excellent yields with little catalyst loading. The catalyst was characterized using different techniques such as X‐ray diffraction (XRD), energy
Step- and atom-economical synthesis of 2-aryl benzimidazoles via the sulfur-mediated redox condensation between o-nitroanilines and aryl methanols
作者:Huy X. Le、Khoa D. Nguyen、Nam T.S. Phan、Ha V. Le、Tung T. Nguyen
DOI:10.1016/j.tet.2022.132918
日期:2022.8
of expensive and sensivitve substrates such as phenylenediamine and aldehyde or metal catalysts. In this work, 2-nitroanilines and benzylalcohols were alternatively applied for the condensation towards 2-phenyl benzimidazoles in the presence of elemental sulfur and an amine. Mechanistic results proved a dualrole of sulfur as both oxidizing and reducing agents in this synthetic pathway. The study was