One-Pot Construction of Medium- and Large-Sized Ring Substituted Furans. Efficient Conversion to Dibenzofurans, Coumestans, and 4-Pyrones

Abstract

New efficient synthesis of medium- and large-sized ring substituted furans is achieved by 1,3-dicarbonyl compounds with vinyl sulfides in the presence of Ag2CO3/Celite (Fétizon's reagent) in a one-pot procedure. The synthesized furans can be further converted to biologically interesting compounds such as dibenzofurans, coumestans, benzofuroquinolinone, and 4-pyrone.