title: Enantioselective formation of cyclopropane spiroindenes from benzofulvenes by phase transfer catalysis.
abstract: The enantio- and diastereoselective formation of indenes spirofused to highly substituted cyclopropanes is described. The application of a new cinchona alkaloid derived ammonium salt in a phase transfer catalysis setup facilitates high selectivity and excellent yields at low catalyst loadings (0.1-1.0 mol%).
authors.affiliation: Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark. kaj@chem.au.dk.
authors.forename: Bjarke S
authors.initials: BS
authors.lastname: Donslund
authors.affiliation: Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark. kaj@chem.au.dk.
authors.forename: Nicolaj Inunnguaq
authors.initials: NI
authors.lastname: Jessen
authors.affiliation: Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark. kaj@chem.au.dk.
authors.forename: Joakim Bøgelund
authors.initials: JB
authors.lastname: Jakobsen
authors.affiliation: Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark. kaj@chem.au.dk.
authors.forename: Alicia
authors.initials: A
authors.lastname: Monleón
authors.affiliation: Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark. kaj@chem.au.dk.
authors.forename: Rune Pagh
authors.initials: RP
authors.lastname: Nielsen
authors.affiliation: Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark. kaj@chem.au.dk.
authors.forename: Karl Anker
authors.initials: KA
authors.lastname: Jørgensen