The ambit of the classical acridine synthesis, via acid-mediated cyclisation of 2-oxodiphenylamines, has been extended to include a sulphoxide-containing precursor. This adaption produced the tetracyclic system of 1 in a single step from 25.
M. G. Kennedy, C. J. Moody, C. W. Rees and R. Thomas, J. Chem. Soc., Perkin Trans. 1, 1991, 2499 DOI: 10.1039/P19910002499
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