title: Design of a New Bimetallic Catalyst for Asymmetric Epoxidation and Sulfoxidation.
abstract: A new chiral tethered 8-quinolinol-based ligand class is developed. The binuclear titanium complex of the ligand operates through a novel mechanism allowing for the regio- and stereoselective epoxidation of primary and tertiary homoallylic alcohols (up to 98% ee), as well as first examples of 2-allylic phenols (up to 92% ee). The new catalyst system also promotes the asymmetric oxidation of γ-hydroxypropyl sulfides giving an important class of chiral sulfoxides that have been inaccessible to date (up to 95% ee).
authors.affiliation: Molecular Catalyst Research Center, Chubu University , 1200, Matsumoto-cho, Kasugai, Aichi 487-8501, Japan.
authors.forename: Sukalyan
authors.initials: S
authors.lastname: Bhadra
authors.affiliation: Department of Chemistry, Aichi University of Education , Igaya-cho, Kariya, Aichi 448-8542, Japan.
authors.forename: Matsujiro
authors.initials: M
authors.lastname: Akakura
authors.affiliation: Molecular Catalyst Research Center, Chubu University , 1200, Matsumoto-cho, Kasugai, Aichi 487-8501, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Yamamoto