We report an efficient method for the preparation of various 2,2′-dihalobiaryls from cyclic diaryliodonium salts. With cheap halogen sources as starting materials, a broad range of 2,2′-diiodobiaryls, 2-bromo-2′-iodobiaryls, and 2-chloro-2′-iodobiaryls were obtained under mild reaction conditions. More importantly, a chiral copper–bisoxazoline catalyst system was further developed for the preparation of axially chiral 2,2′-dihalobiaryls in excellent yields and enantioselectivities, which can serve as versatile precursors for the synthesis of various chiral ligands.

中文翻译：

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铜催化环二芳基碘鎓盐的卤代反应合成2,2'-二卤代联芳基

我们报告了一种从环状二芳基碘鎓盐制备各种2,2'-二卤代二芳基化合物的有效方法。以廉价的卤素源为起始原料，在温和的反应条件下获得了广泛的2,2'-二碘联芳基，2-溴-2'-碘联芳基和2-氯-2'-碘联芳基。更重要的是，进一步开发了手性铜-双恶唑啉催化剂体系，以优异的收率和对映选择性制备了轴向手性的2,2'-二卤代联芳基，可以用作合成各种手性配体的通用前体。