Abstract
By treating 1-alkylindolines with 1-benzoylpyrylium salts in the presence of Lewis acids, good yields of 1-alkyl-5-(pyrid-4′ -yl) indolines can be obtained. 1-alkyl-5-benzoylindolines are side products. The structures of the reaction products were demonstrated by UV and IR spectra, thin-layer chromatography, and dehydrogenation to the corresponding pyridylindoles.
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Kost, A.N., Sheinkman, A.K. & Kazarinova, N.F. Chemistry of indole. Chem Heterocycl Compd 2, 554–559 (1966). https://doi.org/10.1007/BF00477519
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DOI: https://doi.org/10.1007/BF00477519