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Neopierisoids A and B, Two New Chlorinated 3,4-seco-Grayanane Diterpenoids with Antifeedant Activity from Flowers of Pieris japonica

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posted on 31.07.2013 by Yan-Ping Li, Xiao-Nian Li, Ling-Huan Gao, Hai-Zhou Li, Guo-Xing Wu, Rong-Tao Li
Two new chlorinated multiacylated 3,4-seco-grayanane diterpenoids, neopierisoids A and B (1 and 2), were isolated from flowers of the poisonous plant Pieris japonica and were identified from spectroscopic analysis and X-ray diffraction data. Both compounds showed obvious antifeedant activity against Pieris brassicae with an EC50 of 10.07 μg/cm2 for 1 and 5.33 μg/cm2 for 2, indications of toxic properties. Chlorinated 3,4-seco-grayanane diterpenoids in P. japonica may play a defensive role against herbivores.