title: Regioselective reactions of 1-alkylidene-2-oxyallyl cations with furan: control of [4 + 3] cycloaddition, [3 + 2] cycloaddition, and electrophilic substitution.
abstract: The ring opening of alkylidenecyclopropanone acetal under acidic conditions produces the 1-alkylidene-2-oxyallyl cation as an intermediate, which reacts with furan to give the [3 + 2] and [4 + 3] cycloadducts as well as an electrophilic substitution product. The product distribution is controlled by the oxy substituents of the cation and by the solvent employed.
authors.affiliation: Graduate School of Material Science, Himeji Institute of Technology, University of Hyogo, Kohto, Kamigori, Hyogo 678-1297, Japan. fuji@sci.u-hyogo.ac.jp
authors.forename: Morifumi
authors.initials: M
authors.lastname: Fujita
authors.forename: Makoto
authors.initials: M
authors.lastname: Oshima
authors.forename: Sakuro
authors.initials: S
authors.lastname: Okuno
authors.forename: Takashi
authors.initials: T
authors.lastname: Sugimura
authors.forename: Tadashi
authors.initials: T
authors.lastname: Okuyama