A simple and efficient method is demonstrated for the synthesis of benzimidazoles via cyclocondensation of o-phenylenediamine with aldehydes in the presence of catalytic amount of tert-butyl nitrite. All the reactions were carried out at room temperature while the desired products were obtained in good to excellent yields.
the cyclotrimerization reaction of acetyls, which was used as a pre-established network to introduce propyl sulfonic acid through post-synthetic modification strategy, for the fabrication of SO3H-COF with graphene-like multilayer structure. SO3H-COF was employed as an effective heterogeneous catalyst for the synthesis of benzimidazoles, the synthesis of benzodiazepines and one-pot reductive amination