title: Total synthesis of gambierol by using oxiranyl anions.
abstract: Gambierol was isolated as a neurotoxin from the cultured cells of the ciguatera causative dinoflagellate Gambierdiscus toxicus and classified as a member of the polycyclic ether family of marine toxins. The structure consists of a ladder-shaped trans-fused octacyclic ring system that includes 18 stereogenic centers, two 1,3-diaxial dimethyl-substituted tetrahydropyranyl rings, and a partially conjugated triene side chain. The total synthesis of gambierol has been achieved by utilizing an oxiranyl anion strategy in an iterative manner. Synthetic highlights of this route include direct carbon-carbon formation on epoxides, sulfonyl-assisted 6-endo cyclization, and an expansion reaction of the tetrahydropyranyl rings to oxepanes to forge the polycyclic architecture of the target molecule.
authors.affiliation: Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Furuta
authors.forename: Yuki
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: Mariko
authors.initials: M
authors.lastname: Hase
authors.forename: Yuji
authors.initials: Y
authors.lastname: Mori
mesh_terms: D000838:Anions / Q000737:chemistry*; D002922:Ciguatoxins / Q000138:chemical synthesis* / Q000737:chemistry / Q000302:isolation & purification; D003500:Cyclization; D004141:Dinoflagellida / Q000737:chemistry / Q000302:isolation & purification; D004852:Epoxy Compounds / Q000737:chemistry*; D005027:Ethylene Oxide / Q000737:chemistry*; D008387:Marine Toxins / Q000138:chemical synthesis*; D015394:Molecular Structure; D009498:Neurotoxins / Q000138:chemical synthesis* / Q000737:chemistry / Q000302:isolation & purification; D011083:Polycyclic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D013329:Structure-Activity Relationship; D035964:Oxocins
chemical_list: D000838:Anions; D002922:Ciguatoxins; D004852:Epoxy Compounds; D005027:Ethylene Oxide; D008387:Marine Toxins; D009498:Neurotoxins; D011083:Polycyclic Compounds; C435770:gambierol; D035964:Oxocins