Abstract
Chlorination of 1-hydroxyindole-5,6-dicarbonitriles and 1-hydroxypyrrolo[3,4-f]indole-5,7(1H,6H)-diones with N-chlorosuccinimide afforded previously unknown 3,3-dichloro-3Hindole 1-oxides instead of the expected 3-chloro-1-hydroxyindoles. The latter, however, were prepared in good yields by treatment of the above 3,3-dichloro-3H-indole 1-oxides with piperidine in ethanol. Reduction of 3,3-dichloro-5,6-dicyano-3H-indole 1-oxides with Zn in AcOH yielded the corresponding 3-chloroindole-5,6-dicarbonitriles.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1083–1087, June, 2018.
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Chirkova, Z.V., Kabanova, M.V., Filimonov, S.I. et al. Chlorination of 2-substituted 1-hydroxyindoles. Russ Chem Bull 67, 1083–1087 (2018). https://doi.org/10.1007/s11172-018-2184-6
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DOI: https://doi.org/10.1007/s11172-018-2184-6