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Lah, Myoung Soo
Nanoporous Materials Lab
Research Interests
  • Metal-Organic Frameworks (MOFs)

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Synthesis of diastereomeric 1,4-diphosphine ligands bearing imidazolidin-2-one backbone and their application in Rh(I)-catalyzed asymmetric hydrogenation of functionalized olefins

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Title
Synthesis of diastereomeric 1,4-diphosphine ligands bearing imidazolidin-2-one backbone and their application in Rh(I)-catalyzed asymmetric hydrogenation of functionalized olefins
Author
Zhang, YJKim, KYPark, JHSong, CELee, KLah, Myoung SooLee, SG
Keywords
Asymmetric hydrogenation; Backbone chirality; Diphosphine ligands; Olefins; Rhodium
Issue Date
200503
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED SYNTHESIS & CATALYSIS, v.347, no.4, pp.563 - 570
Abstract
The diastereomeric 1,4-diphosphine ligands, (S,S,S,S)-1a, (R,S,S,R)-1b and (R,S,S,S)-1c, with the imidazolidin-2-one backbone were synthesized, and utilized for an investigation of the effects of backbone chirality on the enantioselectivity in the Rh(I)-catalyzed hydrogenation of various functionalized olefinic substrates. It was found that the catalytic efficiencies are largely dependent on the configurations of the α-carbons to phosphine. Thus, the Rh complex of the pseudo-C2-symmetrical diphosphine, (R,S,S,S)-1c, showed excellent enantioselectivities (93.0-98.6% ees) in the hydrogenations of a broad spectrum of substrates, and especially in the hydrogenations of methyl α-(N-acetyamino)-β-arylacrylates (95.3-97.0% ees). However, the enantioselectivities obtained with the C 2-symmetrical (R,S,S,R)-1b were largely dependent on the substrate (19.8-97.3% ees). The Rh complex of ligand 1a having the (S,S,S,S)-configuration showed the lowest catalytic efficiency for all of the substrates examined (0-84.8% ees).
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DOI
http://dx.doi.org/10.1002/adsc.200404286
ISSN
1615-4150
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