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In this work, a novel pyridinium-based dicationic organic salt, [H 2 -BiPyr][ClO 4 ] 2 , was easily prepared and characterized by FT-IR and NMR spectroscopy. After characterization, it was used as the catalyst in a one-pot multi-component reaction of aromatic aldehydes, ethyl acetoacetate and hydroxylamine hydrochloride under aqueous conditions at reflux temperature leading to the formation of 3-methyl-4-arylmethylene isoxazole-5(4 H )-one derivatives. Easy and low-cost preparation of the catalyst, high yields, short reaction times and acceptable reusability of the catalyst are the most important advantages of this method.

polycyclic aromatic compounds

Introduction of [2,2'-Bipyridine]-1,1'-Diium Perchlorate as a Novel and Highly Efficient Dicationic Brönsted Acidic Organic Salt for the Synthesis of 3-Methyl-4-Arylmethylene Isoxazole-5(4 H )-One Derivatives in Water