Irradiation of ethyl 2-cyano-4-methyl-1,2-di-hydroquinoline-1-carboxylates in ethanol gives stereospecifically ethyi endo-1-cyano-6b-methyl-1, 1a,2,6b-tetra-hydrocycloprop[b]indole-2-carboxylates(2,3-homoindoles) in 59–61% yields, which are shown to be useful synthetic intermediates for indole derivatives.
M. Ikeda, S. Matsugashita, F. Tabusa, H. Ishibashi and Y. Tamura, J. Chem. Soc., Chem. Commun., 1974, 433 DOI: 10.1039/C39740000433
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