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Report | Regular issue | Vol 20, No. 6, 1983, pp.1071-1076
Published online, 1st January, 1970
DOI: 10.3987/R-1983-06-1071
Constituents of the Chinese Crude Drug “Sang-Bai-Pi” (Morus Root Barks) IV. Structures of Four New Flavonoids, Sanggenon H, I, J and K

Yoshio Hano and Taro Nomura

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


Two new isoprene substituted flavanone derivatives, named sanggenon H and I, and two new isoprene substituted flavone derivatives, named sanggenon J and K, were isolated from the benzene extract of the Chinese crude drug “Sang-Bai-Pi” (Japanese name “Sohakuhi”), the root barks of Morus sp. (Moraceae). The structures I, II, III, and IV were proposed for these compounds on the basis of the spectroscopic evidence, respectively. Photooxidative cyclization did not occur with sanggenon K (IV) but with sanggenon J (III).