4. Electrochemical cyclization of 1-phenyl-2(-1′chlorophenyl)-substituted five-membered nitrogen heterocycles. Application to the synthesis of phenanthridines James Grimshaw,S. Armstrong Hewitt J. Chem. Soc. Perkin Trans. 1 1990 2995
5. Addition reactions of heterocyclic compounds. Part XXVIII. The synthesis of phenanthridinium-5-vinyloxides and pyrrolo[1,2-f]phenanthridines R. M. Acheson,A. S. Bailey,I. A. Selby J. Chem. Soc. C 1967 2066
6. Acyliminium ion cyclisations to pyrrolo- and pyrido-[1,2-f]phenanthridine and benzo[de]pyrrolo[2,1-a]isoquinoline ring systems Gregory J. Hitchings,Michael D. Thomas,John M. Vernon J. Chem. Soc. Perkin Trans. 1 1992 895