title: First Total Synthesis, Structure Revision, and Natural History of the Smallest Cytochalasin: (+)-Periconiasin G.
abstract: The total synthesis of the smallest cytochalasin isolated so far, periconiasin G, which bears a seven-membered ring in lieu of the usual macrocycle, has been performed from both enantiomers of citronellal, relying on an intramolecular Diels-Alder reaction in favor of the natural endo stereochemistry. We show that, among the four synthesized stereoisomers, including the exo isomers, the one matching the NMR data of the natural product was not that assigned in the original report, imposing structure revision. The natural product, previously isolated from a plant-mutualistic fungus, was biologically investigated taking into account its natural history, showing significant effects against the phytopathogenic fungus Botrytis cinerea and thus opening new opportunities in combating this pest.
authors.affiliation: Muséum National d'Histoire Naturelle, CNRS (UMR 7245), Sorbonne Universités, 57 rue Cuvier (CP 54), 75005, Paris, France.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Zaghouani
authors.affiliation: Muséum National d'Histoire Naturelle, CNRS (UMR 7245), Sorbonne Universités, 57 rue Cuvier (CP 54), 75005, Paris, France.|Sorbonne Universités, Université Pierre et Marie Curie, Paris 6, UFR 927, Paris, France.
authors.forename: Caroline
authors.initials: C
authors.lastname: Kunz
authors.affiliation: Muséum National d'Histoire Naturelle, CNRS (UMR 7245), Sorbonne Universités, 57 rue Cuvier (CP 54), 75005, Paris, France.
authors.forename: Laura
authors.initials: L
authors.lastname: Guédon
authors.affiliation: Institut de Chimie des Substances Naturelles (ICSN-CNRS), 1 Avenue de la Terrasse, 91198, Gif-sur-Yvette Cedex, France.
authors.forename: Florent
authors.initials: F
authors.lastname: Blanchard
authors.affiliation: Muséum National d'Histoire Naturelle, CNRS (UMR 7245), Sorbonne Universités, 57 rue Cuvier (CP 54), 75005, Paris, France. bnay@mnhn.fr.
authors.forename: Bastien
authors.identifier: http://orcid.org/0000-0002-1209-1830
authors.initials: B
authors.lastname: Nay
mesh_terms: D061565:Cycloaddition Reaction; D003572:Cytochalasins / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure
chemical_list: D003572:Cytochalasins; C000627412:periconiasin G
keywords: antifungal activities; cytochalasin; periconiasin; structure revision; total synthesis