The title compound 17 was prepared in good yield starting from 5,6,7,8‐tetrahydro‐l‐naphthol (9) by an advantageous synthesis route consisting of eight steps, as indicated in Scheme 2. Demethylation by reflux heating with anhydrous aluminium chloride in dry benzene furnished 4,9‐dihydroxy‐ and 4,9‐dioxo‐5,6,7,8‐tetrahydro‐1H‐benz[f]indoles (compounds 18 and 19, respectively). All new products were identified on the basis of spectral and analytical data.
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Malesani et al. (1982) studied this question.
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