A copper catalyst in combination with N-fluorobenzenesulfonimide (NFSI) has been reported to functionalize benzylic C–H bonds to the corresponding benzylic sulfonimides via C–N coupling. Here, we reported a closely related Cu-catalyzed method with NFSI that instead leads to C–F coupling. This switch in selectivity arises from changes to the reaction conditions (Cu/ligand ratio, temperature, addition
据报道,
铜催化剂与N-
氟苯磺
酰亚胺(
NFSI)结合可通过 C-N 偶联将
苄基 C-H 键功能化为相应的
苄基磺
酰亚胺。在这里,我们报告了一种与
NFSI 密切相关的 Cu 催化方法,该方法导致 C-F 耦合。这种选择性的转变源于反应条件(Cu/
配体比、温度、碱的添加)的变化,并且进一步受益于在反应中加入 MeB(OH) 2。MeB(OH) 2在反应中充当“
氧化还原缓冲剂”,负责拯救失活的 Cu(II) 以继续促进
氟化反应性。