Yr. Lee et al., One-pot construction of medium- and large-sized ring substituted furans, efficient conversion to dibenzofurans, coumestans, and 4-pyrones, ORG LETT, 2(10), 2000, pp. 1387-1389
New efficient synthesis of medium and large sized ring substituted furans i
s achieved by 1,3-dicarbonyl compounds with vinyl sulfides in the presence
of Ag2CO3/Celite (Fetizon's reagent) in a one-pot procedure. The synthesize
d furans can be further converted to biologically interesting compounds suc
h as dibenzofurans, coumestans, benzofuroquinolinone, and 4-pyrone.