2-Acyl- and 2-ethoxycarbonyl-3-cyanoindoles were prepared from 3-acyl- and 3-ethoxycarbonyl-1,2-dihydrocinnoline-1,2-dicarboximides and potassium cyanide via Michael addition, skeletal rearrangement and subsequent elimination of isocyanate.
S. Tanaka, K. Seguchi and A. Sera, J. Chem. Soc., Perkin Trans. 1, 1995, 519 DOI: 10.1039/P19950000519
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