3. Cyclising nucleophilic addition to azinium systems. Part 1. Reaction of 3-indol-2-ylpyridine, 3-indol-2-ylquinoline, 4-indol-2-ylisoquinoline and pyrido[3,4-a]carbazoles with acetic anhydride M. Mehdi Baradarani,Lesley Dalton,Frank Heatley,Demetrios Cohylakis,John A. Joule J. Chem. Soc. Perkin Trans. 1 1985 1503