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9β-Pimarane Diterpenes from the Tuber of Icacina trichantha
The tuber of Icacina trichantha Oliv. (Icacinaceae) is a home remedy used to treat constipation, poisoning, malaria and to induce emesis in Nigeria. The antidiabetic potentials of its extracts have been reported. In the present study, four 9β-pimarane (9β-podocarpane) diterpenes were isolated from the tuber extract. The structures were elucidated by means of NMR and HR-MS. The planar structures of 1 and 2 were consistent with those of icacinol and humirianthenolide C, respectively, which have been found in other plant sources, and 3 and 4 are new natural products. The relative stereochemistry of the isolates was determined by NOE experiments; and the stereochemistry of 1 was found to be different from that of icacinol through X-ray diffraction analysis.