著者

坂井 進一郎 高山 広光 岡本 敏彦

出版者

公益社団法人日本薬学会

雑誌

藥學雜誌 (ISSN:00316903)

巻号頁・発行日

vol.99, no.6, pp.647-656, 1979-06-25

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Reinvestigation of the alkaloidal constituents of Aconitum japonicum THUNB. of Mt. Takao (Tokyo) was made. In addition to the reported constituents, i.e. isohypognavine, delcosine and dehydrodelcosine, two known compounds, isotalatizidine and condelphine, were isolated. Furthermore, five new bases, i.e. 11-acetylisohypognavine, diacetylisohypognavine, 14-acetyltalatizamine, takaosamine and takaonine, were isolated and their structures were elucidated. Takaosamine was proved to be 18-O-demethyldelcosine from the spectroscopic study on the parent material and the acetyl derivatives, and from the chemical correlation with known diterpene alkaloids, gigactonine and delsoline. The structure of takaonine was deduced to be 2,3-dehydro-14-dehydrodelcosine on the basis of ^<13>C-nuclear magnetic resonance spectral evidence and the derivation to the known diterpene alkaloid, delcosine, by catalytic hydrogenation.