Synthesis and deprotonation of 2-(pyridyl)phenols and 2-(pyridyl)anilines

Abstract

2-(2- and 3-Pyridyl)anilines (1, 2), 2,2-dimethyl-N-[2-(2- and 3-pyridyl)phenyl]propanamides (3, 4), and 2-, 3- and 4-(2-methoxyphenyl)pyridines (7–9) are readily synthesized using cross-coupling reactions. Whereas the amines 1, 2 undergo side reactions, the corresponding amides 3, 4 are deprotonated with lithium 2,2,6,6-tetramethylpiperidide (LTMP): the compound 3 at C6′ under in situ quenching, and the compound 4 at C4′. When the ether 7 is subjected to the same reagent, lithiation occurs at C6′.