Synthesis of a New ChiralN,N,N-Tridentate Pyridinebisimidazoline Ligand Library and Its Application in Ru-Catalyzed Asymmetric Epoxidation
- 9 July 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in Organic Letters
- Vol. 7 (16), 3393-3396
- https://doi.org/10.1021/ol050821e
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.Keywords
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