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The neodolastane diterpenoids comprise a group of 44 compounds including guanacastepenes, heptemerones, plicatilisins, radianspenes, 2,15-epoxy-5,13-dihydroxyneodolast-3-en-14-one and sphaerostanol. These fungal and marine natural products are characterized by a tricyclic neodolastane skeleton that consists of fused five-, seven- and six-membered rings. Their reported antibiotic activities against antibiotic-resistant bacteria together with strong antifungal and anticancer activities and their novel structures render these compounds interesting synthetic targets. The aim of this account is to summarise the progress in the isolation, characterisation and synthesis of these diterpenoids as well as to review their biogenetic origins and diverse biological activities since their discovery in 2000.

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Anticancer vaccine: Antigen 2 made out of a tripeptide of β‐D‐Galp‐(1→3)‐CH2‐α‐D‐GalNAc‐O‐Ser and conjugated with keyhole limpet hemocyanin (KLH) protein induced an early and strong immune response (IgG antibodies) in mice. Antigen 3 made out of an α‐C‐galactoside analogue did not induce such an immune response (see scheme).

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