Treatment of the protopine (7) with strong base and sunlight yields the cis-fused indenobenzazepine (8) while reaction of the oxo-aziridine (9) with acidic reagents leads to the trans-indenobenzazepines (13), (15), and (17), which isomerize with time in the reaction medium to the corresponding cis-analogues (14), (16), and (18).
G. Blaskó, V. Elango, N. Murugesan and M. Shamma, J. Chem. Soc., Chem. Commun., 1981, 1246 DOI: 10.1039/C39810001246
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