title: Organosilanols as catalysts in asymmetric aryl transfer reactions.
abstract: [reaction: see text] Various ferrocene-based organosilanols have been synthesized in four steps starting from achiral ferrocene carboxylic acid. Applying these novel planar-chiral ferrocenes as catalysts in asymmetric phenyl transfer reactions to substituted benzaldehydes afforded products with high enantiomeric excesses. The best result (91% ee) was achieved in the addition to p-chlorobenzaldehyde with organosilanol 2b, which has a tert-butyl substituent on the oxazoline ring and an isopropyl group on the silanol fragment.
authors.affiliation: Institut für Organische Chemie der RWTH Aachen, Landoltweg 1, D-52074 Aachen, Germany.
authors.forename: Salih
authors.initials: S
authors.lastname: Ozçubukçu
authors.forename: Frank
authors.initials: F
authors.lastname: Schmidt
authors.forename: Carsten
authors.initials: C
authors.lastname: Bolm