Indoles were converted by a high yield autoxidation process into quinolones, chlorination of which with thionyl chloride, was accompanied, in the case of unsaturated lactams, by dehydrogenation into the camptothecin-chromophore.
E. Winterfeldt and H. Radunz, J. Chem. Soc. D, 1971, 374 DOI: 10.1039/C29710000374
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