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The absolute configuration of sphaeropsidin A was confirmed by X-ray analysis of the toxin and its 6-O-p-bromobenzoyl derivative. Sphaeropsidin A is a tetracyclic pimarane diterpene produced by different pathogens of forest plants belonging to Diplodia spp. This compound has been long known for its phytotoxic, antimicrobial, and insecticidal activities and, more recently, studied for its promising...
Six forms of sphaeropsidins (SA-SF), three- and tetra-cyclic unrearranged pimarane diterpenes produced by Sphaeropsis sapinea f. sp. cupressi, as well as eight derivatives obtained by chemical modification of SA-SC, were assayed for their bioactivity. The effect of each compound on plants which are host or non-host of the pathogen was investigated. Activity on some plant pathogenic fungi was also...
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