MINDO/3 calculations are reported for the Cornforth rearrangement of 5-methoxyoxazole-4-carboxamide and of the 2-vinyl derivative to the corresponding methyl 5-amino-oxazole-4-carboxylates. The reaction involves an unusual intermediate for which no satisfactory classical structure can be written. The results account well for the experimental evidence concerning such reactions.
M. J. S. Dewar and I. J. Turchi, J. Chem. Soc., Perkin Trans. 2, 1977, 724 DOI: 10.1039/P29770000724
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