Condensation of 8-formyl-7-hydroxyflavones (2a–f) and 8-formyl-7-hydroxy-2-(2′-furyl)-3- methylchromone (2g) with methyl vinyl ketone (3), acrolein (4), and acrylonitrile (5) in the presence of diazabicyclo [2.2. 2] octane (DABCO) under an N2 atmosphere at room temperature using Baylis–Hillman reaction conditions afforded 9-acetyl/formyl/cyano- substituted pyrano2, 3-f] flavones (6a–f, 7a–f, 8a–f) and chromones (6g, 7g, 8g).
