Syntheses of Flavones via the Iodine-Mediated Oxidative Cyclization of 1,3-Diphenylprop-2-en-1-ones

The syntheses of flavones from 1,3-diphenylporp-2-ene-1-ones are described. When 1,3-diphenylprop-2-en-1-ones were heated with iodine in triethylene glycol, oxidative cyclization underwent to obtain flavones in good yields.