Recent Applications of Heteropolyacids and Related Compounds in Heterocycle Synthesis. Contributions between 2010 and 2020

Over the past two decades, polyoxometalates (POM) have received considerable attention as solid catalysts, due to their unique physicochemical characteristics, since, first, they very strong Bronsted acidity, approaching region of a superacid, and second, are efficient oxidizers that exhibit rapid redox transformations under fairly mild conditions. Their structural mobility is also highlighted, since complex molecules can be modified by changing structure or elements compose them model size, charge density, potentials, solubility. Finally, used in substoichiometric amounts reused without an appreciable loss catalytic activity, all which postulate versatile, economic ecological catalysts. Therefore, 2009, we wrote review article highlighting great variety organic reactions, mainly area synthesis bioactive heterocycles used, this new completes with contributions made same for period 2010 2020. The synthesized covered include pyrimidines, pyridines, pyrroles, indoles, chromenes, xanthenes, pyrans, azlactones, azoles, diazines, azepines, flavones, formylchromones, among others.