This review gives an up-to-date overview of the different ways (routes) to the synthesis of coumarin (benzopyrone)-fused, five-membered aromatic heterocycles with one heteroatom, built on the pyrone moiety. Covering 1966 to 2020.
Keywords: benzopyrones; coumarins; five-membered aromatic heterocycles; furan; pyrrole; selenophen; thiophene.