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Asymmetric copper-phosphoramidite catalysed conjugate addition of Et 2 Zn to easily accessible, nearly enantiomerically pure cyclohexenones 2 and 4 was performed. Depending on the enantiomer of the chiral phosphoramidite used, the cis- or trans-3,4,4,5-tetrasubstituted cyclohexanones 5 and 6 could be formed selectively. Surprisingly, there is no directing effect of the 5-ethyl- or 4-alkoxy-substituents...
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