A novel transformation of N-alkoxycarbonylprolines 1 to 4-trifluoroacetyl-2,3-dihydropyrroles 2 was efficiently realized by utilizing trifluoroacetic anhydride, in which probable intermediates were mesoionic 1,3-oxazolium-5-olates B.
M. Kawase, M. Hirabayashi, H. Koiwai, K. Yamamoto and H. Miyamae, Chem. Commun., 1998, 641 DOI: 10.1039/A708294K
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