Abstract 2‐Azaxanthone (5) has been conveniently prepared by condensation of the morpholine enamine of 1‐benzyl‐4‐piperidone witli salicylaldehyde followed by chromium trioxide oxidation and subsequent aromatization. Lithium aluminum hydride reduction of 5 afforded the new fundamental heterocycle 2‐azaxanlhene.
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Sliwa et al. (1977) studied this question.
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