The preparation of magnesium benzyl fluoromalonate and other equivalent materials, the synthetic equivalents of the -CH₂F moiety, is described. Reaction between these reagents and the in situ-formed imidazolides of various carboxylic acids gives beta-keto-alpha-fluoroesters, which upon hydrogenation and spontaneous decarboxylation yields fluoromethyl ketones in excellent yields. The overall transformation from RCOOH to RCOCH₂F is thus illustrated.
本文介绍了
氟丙二酸苄酯
镁和其他等效材料(-CH₂F 分子的合成等价物)的制备方法。这些试剂与各种
羧酸原位形成的
咪唑内酯反应生成 beta-酮-α-
氟酯,氢化和自发脱羧反应生成
氟甲基酮,收率极高。由此可见从 RCOOH 到 RCOCH₂F 的整体转化过程。