title: Cu(I)-catalyzed oxidative cyclization of alkynyl oxiranes and oxetanes.
abstract: In the presence of a Cu(I) catalyst and a pyridine oxide, alkynyl oxiranes and oxetanes can be converted into functionalized five- or six-membered α,β-unsaturated lactones or dihydrofuranaldehydes. This new oxidative cyclization is proposed to proceed via an unusual allenyloxypyridinium intermediate.
authors.affiliation: Département de Chimie, UMR 7652, CNRS/ Ecole Polytechnique, 91128 Palaiseau, France.
authors.forename: Colombe
authors.initials: C
authors.lastname: Gronnier
authors.forename: Søren
authors.initials: S
authors.lastname: Kramer
authors.forename: Yann
authors.initials: Y
authors.lastname: Odabachian
authors.forename: Fabien
authors.initials: F
authors.lastname: Gagosz