(S)-1-t-Butyl 4-methyl N-benzyloxycarbonylaspartate (5a), and (S)-1-t-butyl 4-ally N-benzyloxycarbonylaspartate (5b) have been synthesized from (S)-aspartic acid (2), and can be readily alkylated and hydroxyalkylated at the β-carbon for asymmetric amino acid synthesis.
J. E. Baldwin, M. G. Moloney and M. North, J. Chem. Soc., Perkin Trans. 1, 1989, 833 DOI: 10.1039/P19890000833
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