Abstract
The synthesis of enantiomerically pure 2-aminocyclobutanecarboxylic acids has been refined to improve both the efficiency and the simplicity. These improvements provide a shorter and easier access to the racemic cis-cyclobutane β-amino acid core. Derivatization of this material with a chiral non-racemic oxazolidin-2-one allows easy diastereoisomeric separation and presents the advantage of allowing the non-destructive cleavage of the chiral auxiliary either by hydrolysis or by ammonolysis, thus providing an efficacious access to N-protected derivatives of all four stereoisomers of Boc-2-aminocyclobutanecarboxylic acid.
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We thank Magistère-1 (ENS Cachan) undergraduate student Ms. Charlotte Mocquard for help with some preliminary experiments.
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Declerck, V., Aitken, D.J. A refined synthesis of enantiomerically pure 2-aminocyclobutanecarboxylic acids. Amino Acids 41, 587–595 (2011). https://doi.org/10.1007/s00726-011-0918-y
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DOI: https://doi.org/10.1007/s00726-011-0918-y