Direct conversion to 2-phenyl-4-quinolones via a 4-alkoxyflavylium salt from a naturally occurring flavanone

Article abstract of DOI:10.1002/jhet.5570360539

A flavanone, in which a hydroxyl group at the 5-position was protected with a methyl group, converted to the corresponding 5-methoxy-2-phenyl-4- quinolone via flavylium salt under mild conditions. Flavanone-O- rhamnoglucoside, naringin, was also converted