Abstract
( S)- N-Ferrocenoyl-2-[(diphenylphosphino)methyl]-pyrrolidine 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.
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