title: Constituents of the cultivated mulberry tree.
abstract: From the ethyl acetate extract of root bark of the Japanese cultivated mulberry tree (a variety of Morus alba L.), a novel chalcone derivative with a fused dihydrochalcone partial moiety was isolated and named kuwanon I. The structure was shown to be I on the basis of chemical and spectral data. Kuwanon I (I) is the first example which is regarded biogenetically as a Diels-Alder adduct of a prenylchalcone derivative and a dehydroprenylchalcone derivative. NMR variable temperature studies of I suggested that kuwanon I (I) exists as an equilibrium mixture of conformational isomers in solution.
authors.affiliation: Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nomura
authors.forename: T
authors.initials: T
authors.lastname: Fukai
authors.forename: J
authors.initials: J
authors.lastname: Matsumoto
authors.forename: A
authors.initials: A
authors.lastname: Imashimizu
authors.forename: S
authors.initials: S
authors.lastname: Terada
authors.forename: M
authors.initials: M
authors.lastname: Hama