Alkylamino group exchange upon recyclization of pyridinium salts into anilines

Nitropyridiniium salts react with primary or secondary amines to form alkyl or dialkylanilines as result of recyclization of pyridine nuclei. The alkylamine or dialkylamine group is included in the reaction final product at the open form stage. Aqueous methylamine may open even non-quatèrnized nitropyridines with the following ring closure to alkylanilines.