Chalcones bearing suitably positioned protected 2′-sulfanyl
or 6′-hydroxy groups cyclize to form the corresponding thioflavanones
and flavanones, respectively. The thioflavanones were prepared by
a new method involving deprotection of the sulfanyl group under
alkaline conditions. These reactions provide a route to new biologically
interesting molecules.
chalcone cyclization - thioflavanone synthesis - benzoxathiolone
ring opening - flavanones