title: Tricyclic flavonoids with 1,3-dithiolium substructure.
abstract: The synthesis of new 3-dithiocarbamic flavonoids has been accomplished by the reaction of the corresponding 2-hydroxyaryl dithiocarbamates with aminals. These flavonoids were obtained as a mixture of diastereoisomers, the anti isomer being the major one. The heterocyclization of these compounds provided novel tricyclic flavonoids bearing a 1,3-dithiolium-2-yl ring fused at the 3,4-carbon positions of the benzopyran moiety.
authors.affiliation: Department of Chemistry, "Al. I. Cuza" University of Iasi, 11 Carol I Bv., RO-700506 Iasi, Romania ; Institute of Organic Chemistry, Technical University of Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany.
authors.forename: Lucian G
authors.initials: LG
authors.lastname: Bahrin
authors.forename: Peter G
authors.initials: PG
authors.lastname: Jones
authors.forename: Henning
authors.initials: H
authors.lastname: Hopf