In recent years, metal-organic frameworks (MOFs) are valuable materials because of their applications on the preparation of adsorption, catalysis, sensors, electronics, selective separation, fuel cells, petrochemistry, large scale of industrial products and drug delivery [1-2]. Recently, application of solid acids with sulfonic acids tags as catalysts comprehensively reviewed. The research and application of various multi-SO3H functionalized solid acids are interesting due to their nano structures, Bronsted acidic and environmentally friendly, good candidates for replacing of conventional solid acids, which could be used as a catalyst and reagent [3]. In this paper, cobalt-based metal organic framework as a novel and heterogeneous catalyst with sulfonic acid tags was synthesied and fully characterized by using various analysis techniques. We wish to develop vinylogous anomeric based oxidation mechanism at the preparation of bis(3-indolyl)pyridines from aryl aldehydes, 3-(1H-indol-3-yl)-3-oxopropanenitrile and ammonium acetate in the presence of a catalytic amount of cobalt-based metal organic framework under mild conditions (Scheme 1). The major advantages of the described method are high yields, short reaction times and reusability of the catalyst. The obtained results from this research will be by the idea of rational designs, syntheses and applications of task-specific catalysts.
