The bicyclic diazetidine ester (3) is isomerized by trifluoroacetic acid to the N-amino-2-pyridone ester (4) which on heating loses methanol to give the bicyclic mesoionic compound (5); both reactions are quantitative.
D. Mackay and L. L. Wong, J. Chem. Soc., Chem. Commun., 1974, 621b DOI: 10.1039/C3974000621B
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