Simple aryl chlorides represent challenging substrates in iron-catalyzed borylation. A combination of Li[B(^tBu)pin-Bpin] as the borylating reagent and a catalyst formed in situ from iron(II) triflate and the commercially available N-heterocyclic carbene ligand, IMes, gives significantly improved activity and a much broader scope than previously reported iron-based catalysts. Iron triflate is also a good precatalyst for the borylation of aryl triflates─a previously unreported transformation─and in these cases the IMes ligand is not required.

中文翻译：

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铁催化芳基氯化物和三氟甲磺酸酯的 Miyaura 硼化反应


简单的芳基氯化物是铁催化硼酸化反应中具有挑战性的底物。作为硼化试剂的 Li[B（^tBu）pin-Bpin] 与由三氟甲磺酸铁原位形成的催化剂和市售的 N-杂环卡宾配体 IMes 的组合，与以前报道的铁基催化剂相比，活性显著提高，范围更广。三氟甲磺酸铁也是芳基三氟甲磺酸铁硼化的良好预催化剂（一种以前未报道的转化），在这些情况下不需要 IMes 配体。