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(R)-(+)-Palasonin, a Cantharidin-Related Plant Toxin, Also Occurs in Insect Hemolymph and Tissues

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Abstract

Gas chromatographic and mass spectroscopic analyses of extracts of cantharidin-containing meloid, clerid, and staphylinid beetles revealed the presence of minor to significant amounts of palasonin, previously only known from seeds and fruits of the Indian shrub Butea frondosa (Leguminaceae). Unlike (S)-(–)-palasonin (>99% ee) from B. frondosa, the insects produce palasonin of low ee with the (R)-(+)-enantiomer (0–50% ee) prevailing. The ee of palasonin from individual specimens of predatory insects (Trichodes apiarius), which acquire their chemical protection from cantharidin-producing insects, may vary considerably. The absolute configuration of (S)-(–)-palasonin, previously deduced from indirect chemical and spectroscopic methods, was confirmed by X-ray crystal structure analysis of a cyclic imide derived from (S)-(–)-palasonin and (S)-(–)-1-(4-nitrophenyl)-ethylamine.

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Correspondence to Wilhelm Boland.

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Fietz, O., Dettner, K., Görls, H. et al. (R)-(+)-Palasonin, a Cantharidin-Related Plant Toxin, Also Occurs in Insect Hemolymph and Tissues. J Chem Ecol 28, 1315–1327 (2002). https://doi.org/10.1023/A:1019561517040

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