SCHEDULED MAINTENANCE
Porphyrin β-keto-esters are cyclised to the corresponding phaeoporphyrins in high yield by treatment of the former with 2 equiv. of thallium(III) trifluoroacetate, followed by photolysis and demetallation. In this way, the first formal total syntheses of phaeoporphyrin-a5 dimethyl ester (6a) and 2-vinylphaeoporphyrin-a5 dimethyl ester (6b) have been accomplished.
G. W. Kenner, S. W. McCombie and K. M. Smith, J. Chem. Soc., Perkin Trans. 1, 1974, 527 DOI: 10.1039/P19740000527
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