Treatment of porphyrin carboximidazolides with the magnesium complex of methyl hydrogen malonate affords high yields of the corresponding β-keto-esters which are cyclised to phaeoporphyrins when treated with two equivalents of thallium trifluoroacetate followed by photolysis.
G. W. Kenner, S. W. McCombie and K. M. Smith, J. Chem. Soc., Chem. Commun., 1972, 844 DOI: 10.1039/C39720000844
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