Synthetic strategies in the construction of chromones.

<GRAPHIC></GRAPHIC> Because of important biological applications of chromones, some synthetic strategies leading to more complex derivatives have been widely explored in the past years. Thus, the purpose of this review is to report some recent improvements of the classical synthetic methods and of some nonclassical methods to obtain simple oxygenated chromones. The strategies for synthesis of heterocycle analogs containing phosphorus, nitrogen, and sulfur are also summarized. J. Heterocyclic Chem., (2010). [ABSTRACT FROM AUTHOR]