ex-situ generation of difluoroiodomethane (DFIM) and its immediate use in a Pd-catalyzed difluoromethylation of aryl boronic acids and ester derivatives in a two-chamber reactor is reported. Heating a solution of bromodifluoroacetic acid with sodium iodide in sulfolane proved to be effective for the generation of near stoichiometric amounts of DFIM for the ensuing catalytic coupling step. A two-step difluoromethylation
据报道,
二氟碘甲烷(DFIM)的便捷异位生成及其在双室反应器中
钯催化的芳基
硼酸和酯衍
生物的二
氟甲基化中的直接应用。事实证明,加热
溴二氟乙酸与
碘化钠的
环丁砜溶液可有效生成接近
化学计量的 DFIM,用于随后的催化偶联步骤。芳基(拟)卤化物与
四羟基二硼作为低成本还原剂的两步二
氟甲基化,均由 Pd 催化促进,被证明可以有效地将这种含
氟 C1 基团安装到几个药物相关分子上。最后,通过简单地将 D2 O 添加到 DFIM 生成室,该方法被证明适用于
氘掺入。