Abstract

The synthesis of 12-amino- 7a and 12-hydroxy-2-arylpyrano[2,3-a]acridin-4-ones 7b and 19 via the von Strandtmann flavone annelation procedure is described, in which the pyranone ring is formed by the reaction of a β-ketosulfoxide 13, 18 with an aromatic aldehyde.

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