A Nenitzescu reaction has been used to prepare the indole skeleton 6 having all the functional groups necessary for its conversion into 10a, a key intermediate in a short synthesis of the indolequinone EO 9.
M. Kinugawa, H. Arai, H. Nishikawa, A. Sakaguchi, T. Ogasa, S. Tomioka and M. Kasai, J. Chem. Soc., Perkin Trans. 1, 1995, 2677 DOI: 10.1039/P19950002677
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