Synthesis of Substituted meta-Terphenyls

Novel 5'-methylamino-2'-nitro- m -terphenyls were obtained by the rearrangement of quaternary nitropyridinium salts under the action of aqueous alcoholic alkali and aqueous methylamine. Hantzsch 4-aryl-2-methyl-5-nitro-6-phenyl-1,4-dihydropyridines obtained by the cyclocondensation of nitrochalcones with various enamines were used as starting compounds. The oxidation of 1,4-dihydropyridines with sodium nitrite in acetic acid gave 4-aryl-2-methyl-5-nitro-6-phenylpyridines. The synthesized nitropyridines were alkylated with dimethyl sulfate and methyl fluorosulfonate.