title: Synthetic access to bent polycycles by cation-pi cyclization.
abstract: The presence of an ether oxygen within a chain undergoing cation-polyene cyclization has a profound influence on the stereochemistry of this important construction, apparently due to nucleophilic participation of oxygen in the cyclization process and formation of an oxonium intermediate, leading to bent fused ring systems.
authors.affiliation: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Ryan A
authors.initials: RA
authors.lastname: Shenvi
authors.forename: E J
authors.initials: EJ
authors.lastname: Corey
mesh_terms: D003500:Cyclization; D006576:Heterocyclic Compounds, 4 or More Rings / Q000138:chemical synthesis* / Q000737:chemistry; D015394:Molecular Structure; D010100:Oxygen / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000138:chemical synthesis* / Q000737:chemistry; D011090:Polyenes / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D006576:Heterocyclic Compounds, 4 or More Rings; D011084:Polycyclic Aromatic Hydrocarbons; D011090:Polyenes; D010100:Oxygen