2-Hydroxy-2-(polyhaloalkyl)chroman-4-ones react with diethoxymethyl acetate at 140-150 °C for 15 minutes to give 3-(polyhaloacyl)chromones in good yields. The reactions of these compounds with amines proceeds at C-2 with pyrone ring-opening and formation of 2-(alkyl/arylaminomethylene)-2-hydroxy-2-(polyfluoroalkyl)chroman-4-ones.
2-Hydroxy-2-(polyhaloalkyl)chroman-4-ones 与
乙酸二乙氧基甲酯在 140-150 °C 下反应 15 分钟,以良好的收率得到 3-(polyhaloacyl)chromones。这些化合物与胺的反应在 C-2 进行,
吡喃酮开环并形成 2-(烷基/芳基
氨基亚甲基)-2-羟基-2-(多氟烷基)色满-4-酮。