Three-component synthesis of partially hydrogenated quinolines from 3-substituted chromones, dimedone, and ammonium acetate

Reaction of 3-R-chromones with dimedone and ammonium acetate leads to 2-(2-hydroxyaryl)-7,7-dimethyl-7,8-dihydroquinolin-5(6H)-ones (R = CF3CO, H), 3-(2-hydroxyaroyl)-7,7-dimethyl-7,8-dihydroquinolin-5(6H)-ones (R = CHO), and 8,8-dimethyl-8H-chromeno[2,3-b]quinoline-10,12(7H,9H)-diones (R = CN) depending on the nature of substituent R.