Intramolecular cyclization reaction on the nitrogen atom of oximes of p-hydroxybenzylacetone derivatives proceeds by the treatment with tetrabutylammonium perrhenate and trifluoromethanesulfonic acid in refluxing 1,2-dichloroethane to afford azaspirodienones in good yield. The azaspirodienones are transformed into quinolines via dienone-phenol rearrangement.
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Kusama et al. (1995) studied this question.
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