X=Y-ZH Compounds as Potential 1,3-Dipoles. Part 41. Azomethine Ylide Formation from the Reactions of α-Amino Acids and Esters with Alloxan (Stecker Degradation) and with 1-Phenyl-3-methylpyrazolin-4,5-dione.

Article abstract of DOI:10.1016/S0040-4020(01)80804-8

In situ formation of imines from α-amino acids and alloxan or pyrazolin-4,5-diones results in decarboxylation forming azomethine ylides which can be trapped as their cycloadducts with maleimides.In the absence of maleimides alloxan gives murexide and the