Condensation of α,β-unsaturated β-dimethylaminoaldehydes with heptane-2,4,6-trione unexpectedly affords a new type of substituted phenols (4a–c; 5a,c) due to intramolecular cyclization accompanied by 1,6-deamination.
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Krasnaya et al. (1993) studied this question.
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