A convenient synthetic route to three-ring systems (11) and (12) related to those found in prodigiosin antibiotics is described: the X-ray crystal structure of (12) shows that the exocyclic double bond has a Z-configuration, which allows hydrogen bonding between the methoxy group and the pyrrole NH of ring C.
A. J. Blake, G. A. Hunter and H. McNab, J. Chem. Soc., Chem. Commun., 1990, 734 DOI: 10.1039/C39900000734
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