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Sesquiterpenes from Onopordum illyricum and their antifeedant activity
Sergio Rosselli1, Antonella Maria Maggio, Marisa Canzoneri
1STEMBIO-Sect. Organic Chemistry, Università di Palermo, Viale delle Scienze, Parco d'Orleasn II, 90128 Palermo, Italy.
Abstract:
Phytochemical investigation of the acetone extract of the aerial parts of Onopordum illyricum L. afforded five known sesquiterpenoids: compounds 3 and 4 already isolated from O. illirycum, and 8alpha-[4'-hydroxymethacryloyloxy]-sonchucarpolide (1), 8alpha-[4'-hydroxymethacryloyloxy]-4-epi-sonchucarpolide (2) and 8-(4'-hydroxymethacryloyl)-dehydromelitensin (5), not previously detected in this species. Compounds 4 and 5 showed moderate antifeedant activity against larvae of Spodoptera littoralis.
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