Enaminone, Enaminoesters, and Related Compounds in the Metal‐Free Synthesis of Pyridines and Fused Pyridines

This minireview presents the synthesis and applications of enaminones, enaminoesters, and related compounds. A metal‐free synthesis of pyridines and fused pyridines, pyridyl‐substituted amino acids, hydroxy acids, and polyols which is enabled by ring switching methodology is described, as well as a simple metal‐free synthesis of aryl‐substituted pyridines, and polysubstituted pyridines from polysubstituted butadiene.