Anlai Wang and Ed Biehl
J. Chem. Soc., Perkin Trans. 1, 1998, 1461-1462
DOI:
10.1039/A802106F,
Paper
]benzo[cd]indol-4-ones via benzyne-3-carboxylate
4-Substituted bromobenzoic acids react with 3-thienylacetonitrile under aryne-forming conditions (LDA) to give the corresponding thieno[2,3-f
]benzo[cd]indol-4-ones; this constitutes the first reported synthesis of this heretofore unknown tetracyclic heterocycle.