Easy access to pyranoacridines, pyranoxanthenes, and arylchromenes through a domino reaction
A series of pyrano[2,3,4-kl]acridines has been synthesized through an unprecedented domino reaction involving1-hydroxy-3-methoxy-10-methylacridone and Grignard reagents. This method has been successfully applied to xanthone, anthracenone, and benzophenone