Application of 2-methylpyridinum p-toluenesulfonate ([2- MPy][p-TSA]) as an efficient catalyst for the one-pot synthesis of hexahydroquinoline-3-carboxamides

2-methylpyridinum p-toluenesulfonate ([2-mpy][p-tsa]) as a novel room temperature ionic liquid was synthesized and evaluated as a recoverable catalyst for the one-pot synthesis of hexahydroquinoline-3-carboxamide derivatives by four-component reaction of arylaldehydes, dimedone, acetoacetanilide and ammonium acetate in high to excellent yield in ethanol at 50◦ c. the [2-mpy][p-tsa] catalyst was characterized via ft-ir, ^1h nmr and ^13c nmr spectroscopy. an environmentally benign procedure, four-component in one pot reaction, high yields and simple preparation of the catalyst are some advantages of this work.