β-amino acid N-Boc-ADDA is prepared following a disconnection of the CC bond between the two E,E double bonds. The stereochemistry of the two synthons was controlled using the alkylation of chiral bromoallenes derived from naturally occurring (S)-serine and (S)-phenyllactic acid. The cupration of bromoallenes derived from (S)-serine also provides a general method for the synthesis of chiral β-alkylated
1,3-Stereocontrol with Bromoallenes. Synthesis of <i>N</i>-Boc-ADDA, the Unique Amino Acid Present in Several Inhibitors of Serine/Threonine Phosphatases