Oxidation of chelated hydroxy-L-proline by thionyl chloride gives substituted dihydropyrroles, which undergo subsequent base-induced elimination to give chelated pyrrole-2-carboxylate complexes.
A. Hammershøi, R. M. Hartshorn and A. M. Sargeson, J. Chem. Soc., Chem. Commun., 1988, 1267 DOI: 10.1039/C39880001267
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