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Synlett 2012; 23(19): 2777-2784
DOI: 10.1055/s-0032-1317505
DOI: 10.1055/s-0032-1317505
letter
Bis(phosphinite) with C 2-Symmetric Axis; Effects on the Ruthenium(II)- Catalyzed Asymmetric Transfer Hydrogenation of Acetophenone Derivatives
Further Information
Publication History
Received: 19 July 2012
Accepted after revision: 28 September 2012
Publication Date:
09 November 2012 (online)
Abstract
Chiral ruthenium catalyst systems generated in situ from [Ru(η6-p-cymene)(μ-Cl)Cl]2 complex and chiral C 2-symmetric bis(phosphinite) ligands based on amino alcohol derivatives were employed in the asymmetric transfer hydrogenation of aromatic ketones to give the corresponding optically active alcohols in high yield. The best results were obtained in the [Ru(η6-p-cymene)(μ-Cl)Cl]2 and (2S)-2-[benzyl(2-{benzyl[(2S)-1-[(diphenylphosphanyl)oxy]-3-phenyl propan-2-yl]amino}ethyl)amino]-3-phenylpropyl diphenylphosphinite or (2R)-2-[benzyl(2-{benzyl[(2R)-1-[(diphenylphosphanyl)oxy]-3-phenylpropan-2-yl]amino}ethyl)amino]-3-phenylpropyl diphenylphosphinite catalytic systems, which gave enantioselectivities of up to 93% ee and 99% conversion.
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