The first stepwise syntheses of unsymmetrically substituted 1,19-dibromo-a,c-biladienes, e.g.3c, via the so-called ‘tripyrrene route’, and their facile conversion into biliverdins (bilin-1,19-diones), e.g.4c, are described; this methodology is also adapted for the preparation of symmetrical biliverdins 4a, as well as corroles 5 and azaporphyrins 6.
R. K. Pandey, H. Zhou, K. Gerzevske and K. M. Smith, J. Chem. Soc., Chem. Commun., 1992, 183 DOI: 10.1039/C39920000183
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