Summary.
N-Acyl-α-triphenylphosphonioglycinates when treated with triethylamine are transformed to an equilibrium mixture of the corresponding N-acyliminoacetates and N-acyl-α-triphenylphosphoranylideneglycinates. Wittig reaction of the latter ylides with aromatic and aliphatic aldehydes or ketones enables a new easy entry to N-acyl-α,β-dehydro-α-amino acid esters.
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Mazurkiewicz, R., Kuźnik, A., Grymel, M. et al. N-Acyl-α-triphenylphosphonioglycinates in the Synthesis of α,β-Dehydro-α-amino Acid Derivatives. Monatshefte für Chemie 135, 807–815 (2004). https://doi.org/10.1007/s00706-003-0167-1
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DOI: https://doi.org/10.1007/s00706-003-0167-1