title: Contrasting diastereofacial selectivity associated with N-phenyltriazolinedione cycloadditions to oxaspirocycloheptatrienes.
abstract: [reaction: see text] The cycloaddition of N-phenyltriazolinedione to a pair of spirocyclic cycloheptatrienes featuring a tetrahydrofuran or tetrahydropyran ring is shown to proceed with opposite pi-facial stereoselectivity. In addition, the furan undergoes direct [4+2] cycloaddition to the cycloheptatriene whereas the pyran product is a diazetidine.
authors.affiliation: Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210, USA. paquette.1@osu.edu
authors.forename: Leo A
authors.initials: LA
authors.lastname: Paquette
authors.forename: Peter
authors.initials: P
authors.lastname: Webber
authors.forename: Iain
authors.initials: I
authors.lastname: Simpson