Neither the olefin geometry nor the configuration of secondary allylic substrates in palladium-catalyzed allylic alkylations of chelated enolates has an influence on the newly formed stereogenic center of the amino acid (see scheme, TBDPS=tert-butyldiphenylsilyl, Tfa=trifluoroacetyl). This is controlled exclusively by the protecting group on the chiral center. Therefore, the choice of the protecting group on the allylic alcohol can lead to either of the diastereomeric amino acids in a highly stereoselective fashion.
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Kazmaier et al. (2005) studied this question.
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