title: Monomeric rhodium(II) catalysts for the preparation of aziridines and enantioselective formation of cyclopropanes from ethyl diazoacetate at room temperature.
abstract: A family of bis(oxazoline) complexes of coordinatively unsaturated monomeric rhodium(II) (2a,b, 3a,b) are described. These complexes serve as catalysts for cyclopropanation of olefins by ethyl diazoacetate, giving excellent yields (66-94%). Enantioselectivities for the cis product isomers are good (61-84%). The reaction shows an unusual preference for formation of the cis isomers. Catalytic aziridination of N-aryl imines with ethyl diazoacetate is also described.
authors.affiliation: Department of Chemistry and Center for New Directions in Organic Synthesis (CNDOS), University of California, Berkeley, California 94720, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Krumper
authors.forename: M
authors.initials: M
authors.lastname: Gerisch
authors.forename: J M
authors.initials: JM
authors.lastname: Suh
authors.forename: R G
authors.initials: RG
authors.lastname: Bergman
authors.forename: T D
authors.initials: TD
authors.lastname: Tilley