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Tanemossu Fobofou, S. A.; Franke, K.; Sanna, G.; Porzel, A.; Bullita, E.; La Colla, P.; Wessjohann, L. A.; Isolation and anticancer, anthelminthic, and antiviral (HIV) activity of acylphloroglucinols, and regioselective synthesis of empetrifranzinans from Hypericum roeperianum Bioorg. Med. Chem. 23, 6327-6334, (2015) DOI: 10.1016/j.bmc.2015.08.028
From the ethno-medicinally used leaves of Hypericum roeperianum we isolated a new tricyclic acylphloroglucinol (1), a new tetracyclic acylphloroglucinol (2), and a new prenylated bicyclic acylphloroglucinol (3) together with four known prenylated (4–7) and three known tetracyclic acylphloroglucinol derivatives (8–10). Structure elucidation was based on UV, IR, [α]D25, 1D- and 2D-NMR experiments. Furthermore, empetrifranzinans A (8) and C (9) were synthesized regioselectively in only two steps. The isolated compounds were evaluated for their cytotoxicity against PC-3 and HT-29 cancer cell lines as well as antibacterial and anthelmintic activities. They were also tested in cell-based assays for cytotoxicity against MT-4 cells and for anti-HIV activity in infected MT-4 cells. Significant anthelmintic activity against Caenorhabditis elegans was exhibited by compound 7 (3-geranyl-1-(2′-methylbutanoyl)-phloroglucinol), which might provide a new lead.