Synthesis of 4-[ω-(3-thienyl)alkyl]pyridines and 4-[ω-(3-thienyl)alkyl]-2,2'-bipyridines

Abstract

The synthesis is reported of 4-[ω-(3-thienyl)alkyl]pyridine (2), 4-[ω-(3-thienyl)alkyl]-2,2′- bipyridine (3) and 4-methyl-4'-[ω-(3-thienyl)alkyl]-2,2′-bipyridine (4), where the length of the alkyl chain is varied (n = 2, 5, 7, 9, 11). The synthetic methodology involved the reaction of the 3-(ω- bromoalkyl ) thiophen with the anions derived from 4-methylpyridine, 4-methyl-2,2′-bipyridine or 4,4′-dimethyl-2,2′-bipyridine by lithiation . The n.m.r. (¹H and ¹³C) and electronic spectral characteristics of the compounds are discussed.