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Polyoxygenated Klysimplexane- and Eunicellin-Based Diterpenoids from the Gorgonian Briareum violaceum.

ABSTRACT: Three new polyoxygenated diterpenoids with a rare 4-isopropyl-1,5,8a-trimethylperhydrophenanthrane structure of the klysimplexane skeleton, briarols A‒C (1‒3), and one eunicellin-based diterpenoid, briarol D (4), were isolated from Briareum violaceum, a gorgonian inhabiting Taiwanese waters. The chemical structures of these compounds were determined by employing extensive analyses of NMR and high-resolution electrospray ionization mass spectrometry (HRESIMS) data. Metabolites 1‒3 were found to possess the rarely found skeleton of the diterpenoid klysimplexin T. All isolated compounds showed very weak cytotoxic activity against the growth of three cancer cell lines. A plausible biosynthetic pathway for briarols A‒C from the coexisting eunicellin diterpenoid briarol D (4) was postulated.

SUBMITTER: Ahmed AF

PROVIDER: S-EPMC8198191 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Briarenones A‒C, New Briarellin Diterpenoids from the Gorgonian Briareum violaceum.

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New Eunicellin-Type Diterpenes from the Panamanian Octocoral Briareum Asbestinum.

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