title: Selenium-catalyzed regioselective cyclization of unsaturated carboxylic acids using hypervalent iodine oxidants.
abstract: A new and convenient selenium-catalyzed regioselective cyclization of γ,δ-unsaturated carboxylic acids to the corresponding 3,6-dihydro-2H-pyran-2-ones is described. The cyclization products have been obtained in good to excellent yields using diphenyl diselenide as a catalyst and [bis(trifluoroacetoxy)iodo]benzene as a stoichiometric oxidant.
authors.affiliation: School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, UK.
authors.forename: Fateh V
authors.initials: FV
authors.lastname: Singh
authors.forename: Thomas
authors.initials: T
authors.lastname: Wirth