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■ Structure of Mulberrofuran K, an Optically Active Natiral Diels-Alder Type Adduct from Chinese Crude Drug "Sang-Bai-Pi" (Morus Root Bark)

Yoshio Hano, Toshio Fukai, Hideaki Kohno, Kazuhiro Hirakura, Taro Nomura,* and Jun Uzawa

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

Abstract

From the methanol extract of the Chinese crude drug “Sang-Bai-Pi” (Japanese name “Sohakuhi”), the root bark of Morus sp. (Moraceae), a 2-arylbenzofuran derivative was isolated and named mulberrofuran K. Its structure was shown to be 1 on the basis of the spectral and chemical evidence. Mulberrofuran K is optically active and regarded biogenetically as a variation of a Dlels-Alder type adduct of a chalcone derivative and a dehydroprenyl-2-arylbenzofuran derivative.