Recent Progress in the Synthesis of Flavonoids: From Monomers to Supra-Complex Molecules

More than five thousand naturally occurring flavonoids are known to exist. In this paper, we review the synthesis and transformation of flavan, flavone, flavonol, proanthocyanidin, anthocyanin, and related compounds on the basis of new and conceptual methodologies that have arisen in the last decade (2000-2010). We especially focus on new skeleton formations and the synthesis of flavonoid glycosides.