The first example of direct fixation of sulfur dioxide between heteroaryls and aryl halides has been developed via copper‐catalyzed regioselective cleavage of C−X and C−H bonds under base‐free and ligand‐free conditions by using DABSO (1,4‐diazabicyclo[2.2.2]octane bis(sulfur dioxide)) as a solid and bench‐stable sulfur dioxide surrogate. This mild protocol results in double C−S bond‐forming reactions from simple precursors in the absence of prefunctionalized organometallic reagents, arenediazonium salts, and iodonium salts which extends the still limited number of sulfur dioxide fixation strategies.

中文翻译：

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铜催化的C-X和C-H键的区域选择性裂解：固定二氧化硫的策略

通过使用DABSO（1,4-二氮杂双环）在无碱和无配体条件下通过铜催化的C-X和C-H键的区域选择性裂解，开发了二氧化硫在杂芳基和芳基卤化物之间直接固定的第一个例子[2.2.2]辛烷双（二氧化硫）作为固体和稳定的二氧化硫替代物。这种温和的方案在没有预功能化的有机金属试剂，槟榔鎓盐和碘鎓盐的情况下，由简单的前体形成了双重的C-S键形成反应，从而扩展了仍然有限的二氧化硫固定策略。