title: Synthesis of a new chiral N,N,N-tridentate pyridinebisimidazoline ligand library and its application in Ru-catalyzed asymmetric epoxidation.
abstract: A small ligand library of chiral tridentate N,N,N-pyridinebisimidazolines have been synthesized for the first time. This new class of ligands can be easily tuned and synthesized on multi g-scale. The usefulness of the ligands is shown in the ruthenium-catalyzed asymmetric epoxidation with hydrogen peroxide as oxidant. Excellent yields (>99%) and good enantioselectivities (up to 71% ee) have been obtained for the epoxidation of aromatic olefins. [reaction: see text]
authors.affiliation: Leibniz-Institut für Organische Katalyse (IfOK) an der Universität Rostock e.V., Albert-Einstein-Strasse 29A, D-18059 Rostock, Germany.
authors.forename: Santosh
authors.initials: S
authors.lastname: Bhor
authors.forename: Gopinathan
authors.initials: G
authors.lastname: Anilkumar
authors.forename: Man Kin
authors.initials: MK
authors.lastname: Tse
authors.forename: Markus
authors.initials: M
authors.lastname: Klawonn
authors.forename: Christian
authors.initials: C
authors.lastname: Döbler
authors.forename: Bianca
authors.initials: B
authors.lastname: Bitterlich
authors.forename: Anne
authors.initials: A
authors.lastname: Grotevendt
authors.forename: Matthias
authors.initials: M
authors.lastname: Beller