Alpinia属植物の成分研究(第9報) : クマタケラン種子の成分 : 1新フラボノイド, Kumatakeninの構造

概要

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Examination was made on the seeds of Alpinia Kumatake MAKINO (A.formosana K.SCHUMANN) and quercetin, kaempferol, rhamnocitrin, and a new flavonoid derivative (kumatakenin), yellow needles of m.p. 246〜247°, were isolated by thinlayer chromatography and column chromatography. Analyses of kumatakenin agreed with C_<17>H_<14>O_6,involving two methoxyl and two hydroxyl groups. It gives 3,5,7,4'-tetrahydroxyflavone (kaempferol) by demethylation and 3,5,4'-trihydroxy-7-methoxyflavone (rhamnocitrin) by partial demethylation. UV and NMR spectra of kumatakenin indicated that it is a kaempferol derivative with hydroxyl groups in 5- and 4'-positions, and methoxyl groups in 3- and 7-positions. Thus, the structure of kumatakenin has been established as 5,4'-dihydroxy-3,7-dimethoxyflavone.
公益社団法人日本薬学会の論文
1967-04-25