Reaction of porphyrin-2,3-diones with aromatic aldehydes and NH4OAc in AcOH–CHCl3 affords 2-aryl-1H-imidazo[4,5-b]porphyrins which, with appropriate substitution, are useful building blocks for the synthesis of multi-porphyrin arrays; porphyrin-tetraones are similarly converted into the corresponding bis-fused systems.
M. J. Crossley and J. A. McDonald, J. Chem. Soc., Perkin Trans. 1, 1999, 2429 DOI: 10.1039/A905507J
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