Journal
TETRAHEDRON LETTERS
Volume 46, Issue 32, Pages 5413-5416Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2005.05.143
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(S)-N-Ferrocenoyl-2-[(diphenylphosphino)methyl]-pyi-rolidine 3 was conveniently prepared from commercially available L-proline and ferrocenecarboxylic acid. In the presence of a catalytic amount of chiral ligand 3 (4 mol %) and Cu(OTf)(2) (3 mol the asymmetric addition of diethylzinc to N-sulfonylimines was achieved in 57-99% yield with up to 88% ee. (c) 2005 Elsevier Ltd. All rights reserved.
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