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2005
Enantioselective syntheses
O 0031
Synthesis of Aminoethanethiol Trityl Ether Ligands for Ruthenium-Catalyzed
Transfer Hydrogenation. — A variety of title aminoethanethiol deriva12- 036 Asymmetric
tives (I) are prepared and tested as ligands in the asymmetric Ru-catalyzed transfer hydrogenation of aromatic ketones. An extensive optimization is presented revealing that
the sense of stereoinduction can be controlled not only by the nature of ligands but also
by the Ru/ligand ratio. High yields and enantioselectivities can be achieved although
the results obtained with the aminoethanol derivative (II) are better. —
(HARFOUCHE, J.; HERAULT, D.; TOMMASINO, M. L.; PELLET-ROSTAING, S.;
LEMAIRE*, M.; Tetrahedron: Asymmetry 15 (2004) 21, 3413-3418; Lab. Catal.
Synth. Org., CNRS, Univ. Claude Bernard, F-69622 Villeurbanne, Fr.; Eng.) —
Mischke
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