Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Chemical Constituents of Alnus sieboldiana (BETULACEAE) II. The Isolation and Structure of Flavonoids and Stilbenes
Yoshinori Asakawa
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1971 Volume 44 Issue 10 Pages 2761-2766

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Abstract

Four new flavonoids with an unsubstituted B-ring, alnusin, alnetin, alnustin, and alnustinol, isolated from Alnus sieboldiana were established to be 3,5,7-trihydroxy-6-methoxyflavone (1), 5-hydroxy-6,7,8-trimethoxyflavone (2), 5-hydroxy-3,6,7-trimethoxyflavone (3), and 3,5,7-trihydroxy-6-methoxyflavanone (15) respectively. Some previously-known flavonoids, chrysin (4), izalpinin (5), tectochrysin (6), pinocembrin (16), pinobanksin (17), strobopinin (19) and naringenin (20), and some stilbenes, pinosylvin (24), pinosylvin monomethyl ether (25), and pinosylvin dimethyl ether (26), were identified along with the above new flavonoids.

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