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The enantioselective conjugate addition using a number of scalemic β-amino sulfide ligands to achieve enantiomeric excesses of up to 64% are described together with the X-ray absolute structure analysis of a dimeric copper(I) complex.
Bifurcated routes to two series of chiral secondary β-amino sulfides 5a - c and 11a - c have been developed from L-proline and (S)-phenylglycine, respectively. The developed methodology has also led to the synthesis of the tertiary β-amino thiol 7 and the primary β-amino sulfide 12 from L-proline and (S)-phenylglycine, respectively.