Fluorineâmetal exchange reaction of 2,3,4,4,4-pentafluorocrotonates with organocuprate derived from Grignard reagent and CuCN takes place efficiently to generate the β-metallated tetrafluorocrotonate intermediate, which reacts with various electrophiles to give β-substituted 2,4,4,4-tetrafluorocrotonates.
2,
3,4,4,4-五
氟巴豆酸盐与
格氏试剂和 CuCN 生成的有机uprate 发生
氟金属交换反应,生成δ-
金属化的四
氟巴豆酸盐中间体,该中间体与各种亲电体反应生成δ-取代的 2,4,4,4-四
氟巴豆酸盐。