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Paper | Regular issue | Vol 24, No. 9, 1986, pp.2603-2610
Published online, 1st January, 1970
DOI: 10.3987/R-1986-09-2603
Structures of Kuwanons Y and Z, Two New Stilbene Derivatives from the Cultivated Mulberry Tree (Morus alba L.)

Yoshio Hano, Hiromi Tsubura, and Taro Nomura*

*Faculty of Pharmaceutical Sciences, Toho University, 2-2-1, Miyama, Funabashi, Chiba 274-8510, Japan


Two novel stilbene derivatives named kuwanons Y and Z were isolated from the acetone extract of the reddish violet powder (lenticel) from the surface of the root bark of cultivated mulberry tree (Ichinose, a cultivated variety of Morus alba L.). The structures of kuwanons Y and Z were shown to be 1 and 2, respectively, on the basis of spectral and chemical evidence. Kuwanon Y is regarded biogenetically as a Diels-Alder type adduct of a chalcone derivative and a dehydroprenylstilbene derivative, while kuwanon Z as a variation of a Diels-Alder type adduct.