Treatment of readily accessible 1,19-bis(t-butoxycarbonyl)-a,c-biladienes or b-bilenes with bromine in trifluoroacetic acid affords excellent yields of biliverdins (bilin-1,19-diones).
K. M. Smith and D. Kishore, J. Chem. Soc., Chem. Commun., 1982, 888 DOI: 10.1039/C39820000888
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