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In addition: The Mukaiyama–Michael addition in the presence of a chiral copper(II) Lewis acid is a highly enantioselective and efficient method for the construction of a broad range of chiral γ-functionalized diazoacetoacetates. These products can be conveniently transformed into useful enantiomer-enriched 1,5-diesters (see scheme, Np=1-naphthyl, TBS=tert-butyldimethylsilyl).
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Xu et al. (2011) studied this question.
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