Phytochemistry p. 85 - 90 (1994)
Update date:2022-08-04
Topics:
Bruyn, Andre De
Becu, Christian
Lambein, Fernand
Kebede, Naod
Abegaz, Berhanu
Nunn, Peter B.
The diketopiperazine suggested to be the intermediate during the spontaneous isomerization of β-ODAP and α-ODAP was synthesized.Its behaviour was studied at selected pH values and provided evidence that its natural occurrence is unlikely. 2-Hydroxy-imidazolidine-2,4-dicarboxylic acid (for the rearrangement β-ODAP <-> α-ODAP) or 2-hydroxy-pyrimidine-2,4-dicarboxylic acid (for the rearrangement γ-ODAB <-> α-ODAB) are suggested to be the unstable intermediates.
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