An efficient procedure for the synthesis of 2,4,6-triarylpyridines (Kröhnke pyridines) by the one-pot multicomponent condensation of aldehydes (1 equiv) with acetophenones (2 equiv) and ammonium acetate (1.2 equiv) in the presence of catalytic amounts of oxozirconium(IV) chloride (ZrOCl 2 ) under solvent-free conditions is described. In this work, four products have been reported for the first time. Easy work-up, simple methodology, clean reaction and reusability of the catalyst are some advantages of this work.

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A simple, highly efficient and green procedure for the condensation of aryl and alkyl 1,2-diamines with α-diketones in the presence of catalytic amount of phenol(20 mol%) at room temperature is described. Using this method, quinoxaline derivatives as biologically interesting compounds are produced in high to excellent yields and short reaction times.

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