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32. Synthesis of fused benzofuranes by dehydration of cyclic phenyl-beta-dicarbonyl compounds
Kappe Th., Brandner A., Stadlbauer W. Monatsh. Chem. 118 (1987) 1177-1184

Abstract: 3-Hydroxy-3-phenyl-quinoline-2,4-diones (1 ) cyclize by treatment with strong acids to give benzofuroquinolinones 3. In the same manner 2-hydroxy-2-phenylphenalenedione (7) reacts to benzofuro-phenalenone 10.

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