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Complete stereocontrol with the added advantage of functional-group tolerance in copper-catalyzed 1,4-additions of organozinc reagents to enones has been achieved for the first time with the chiral phosphoramidite L* as ligand in the copper complex Eq. (a), Tf = trifluoromethanesulfonate. The zinc enolate intermediate of the reaction can be trapped with aldehydes.
Feringa et al. (Mon,) studied this question.
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