SCHEDULED MAINTENANCE
A new chiroporphyrin is prepared in 60% yield using complementary intramolecular hydrogen-bonding interactions between N-acylurea substituents to direct the cyclisation of the tetrapyrrolic intermediate; similar hydrogen-bond assistance by carboxylic acid functions is suggested for cyclisation of hydroxymethylbilane to uroporphyrinogen I.
C. Pérollier, J. Pécaut, R. Ramasseul, J. Marchon and R. Bau, Chem. Commun., 1999, 1597 DOI: 10.1039/A904134F
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