Nitropyridines: III. Synthesis of meta-terphenyls by recyclization of nitropyridinium salts

Abstract

A two-component Hantzsch synthesis was applied to preparation of nitropyridines and their quaternary salts from various enamines and chalcones based on nitroacetophenone. The recyclization of nitropyridinium quaternary salts under the treatment with an aqueous-alcoholic alkali led to preparation of 5'-methylamino-2'-nitro-m-terphenyl derivatives. © Nauka/Interperiodica 2006.