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Paper | Regular issue | Vol 32, No. 3, 1991, pp.499-510
Published online, 1st January, 1970
DOI: 10.3987/COM-91-5661
Revised Structures of Albanins D and E, Geranylated Flavones from Morus alba

Toshio Fukai and Taro Nomura*

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


The chemical shifts of the proton signals of the hydrogen-bonded hydroxyl groups of albanins D and E, isolated from Morus alba L. (Moraceae), were compared with those of the hydroxyl groups of 6- or 8-isoprenoid substituted flavones to doubt the location of the geranyl groups of albanins D and E. The proposed structures (3) and (4) for albanins D and E were revised to the structures (1) and (2), respectively, on the basis of the syntheses of 6-geranylated flavones (1 and 2) and 8-geranylated flavones (3 and 4).