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New Ruthenium Catalysts for Asymmetric Transfer Hydrogenation of Prochiral Ketones

✍ Scribed by Stephan Enthaler; Bernhard Hagemann; Santosh Bhor; Gopinathan Anilkumar; Man Kin Tse; Bianca Bitterlich; Kathrin Junge; Giulia Erre; Matthias Beller

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 139 KB
Volume: 349
Category: Article
ISSN: 1615-4150
DOI: 10.1002/adsc.200600475

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✦ Synopsis

Abstract

Tridentate N,N,N‐pyridinebisimidazolines have been studied as new ligands for the enantioselective transfer hydrogenation of prochiral ketones. High yields and excellent enantioselectivity up to >99 % ee have been achieved with an in situ generated catalytic system containing dichlorotris(triphenylphosphine)ruthenium and 2,6‐bis‐([4R,5R]‐4,5‐diphenyl‐4,5‐dihydro‐1__H__‐imidazol‐2‐yl)‐pyridine (3a) in the presence of sodium isopropoxide.

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