Clerodendrins from Clerodendron trichotomum and their feeding stimulant activity for the turnip sawfly
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- 作者：Kawai ; Kunji ; Amano ; Takashi ; Nishida ; Ritsuo ; Kuwahara ; Yasumasa ; Fukami ; Hiroshi
- 关键词：Clerodendron trichotomum ; Verbenaceae ; Athalia rosae ruficornis ; turnip sawfly ; Tenthredinidae ; pharmacophagy ; feeding stimulants ; defense substance ; neo-clerodane diterpenoids ; Clerodendrin
- 刊名：Phytochemistry
- 出版年：1998
- 出版时间：December 5, 1998
- 年：1998
- 卷：49
- 期：7
- 页码：1975-1980
- 全文大小：245 K
文摘
Adults of the turnip sawfly, Athalia rosae ruficornis, are stimulated to feed pharmacophagously on the leaves of Clerodendron trichotomum by bitter neo-clerodane diterpenoids contained in glandular organs on the leaf surface. Four new neo-clerodane analogues, clerodendrins E, F, G and H, were isolated from leaf surface extracts of C. trichotomum. Clerodendrins E, F and G were characterized as analogues of clerodendrin A, in which the acyl moiety at the C-3β position was replaced by 2-acetoxy-2-methylpropanoyl, 2,3-diacetoxy-2-methylbutanoyl and 2-methylbutanoyl moieties, respectively. Clerodendrin H was shown to be the 7,8-dihydro-derivative of F. Of the seven clerodendrins (A–H) isolated from C. trichotomum, only the 7,8-dihydro analogues (clerodendrins B, D and H) exhibited distinct feeding stimulant activity to adults of the turnip sawfly.