title: The total synthesis of (+)-tedanolide--A macrocyclic polyketide from marine sponge Tedania ignis.
abstract: Tedanolide, which was isolated by Schmitz in 1984 from the marine sponge Tedania ignis, is a highly cytotoxic macrolide leading to strong growth inhibition of P338 tumor cells in bioassays. A unique structural feature of the known tedanolides is the primary hydroxyl group incorporated in the macrolactone. This unusual motif for macrolactones originated from PKS biosynthesis might arise through lactonizations others than those derived by the thioesterase reaction. First experimental data that support this hypothesis and reflect the inherent preference of PKS-induced macrolactonization were obtained during this synthesis. The inherent preference for the formation of a 14-membered macrocyclization is discussed together with the pivotal steps in the synthesis.
authors.affiliation: Institut für Organische Chemie, Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover, Germany.
authors.forename: Gunnar
authors.initials: G
authors.lastname: Ehrlich
authors.forename: Jorma
authors.initials: J
authors.lastname: Hassfeld
authors.forename: Ulrike
authors.initials: U
authors.lastname: Eggert
authors.forename: Markus
authors.initials: M
authors.lastname: Kalesse
mesh_terms: D000818:Animals; D007783:Lactones / Q000138:chemical synthesis / Q000737:chemistry; D018942:Macrolides / Q000138:chemical synthesis* / Q000737:chemistry; D008968:Molecular Conformation; D011161:Porifera / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D007783:Lactones; D018942:Macrolides; C119775:tedanolide