- Chiral auxiliary (3S)-N,N'-bis-(p-methoxybenzyl)-3-isopropylpiperazine- 2,5-dione 1 was employed for the synthesis of both enantiomers of phenylalanine using a regioselective deprotonation/stereoselective reprotonation strategy. Modification of this approach enables the efficient deracemisation of (±)-phenylalanine.
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Deracemisation of alpha-amino acids - (R)- and (S)-phenylalanine from the same enantiomer of a homochiral auxiliary
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