Disclosed is a mild, scalable, visible-light-promoted cross-coupling reaction between thiols and aryl halides for the construction of C–S bonds in the absence of both transition metal and photoredox catalysts. The scope of aryl halides and thiol partners includes over 60 examples and therefore provides an entry point into various aryl thioether building blocks of pharmaceutical interest. Furthermore, to demonstrate its utility, this C–S coupling protocol was applied in drug synthesis and late-stage modifications of active pharmaceutical ingredients. UV–vis spectroscopy and time-dependent density functional theory calculations suggest that visible-light-promoted intermolecular charge transfer within the thiolate–aryl halide electron donor–acceptor complex permits the reactivity in the absence of catalyst.

中文翻译：

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通过分子间电荷转移的可见光促进的C–S交叉耦合

公开了在不存在过渡金属和光氧化还原催化剂的情况下，硫醇与卤代芳基之间温和，可扩展，可见光促进的C-S键的交叉偶联反应。芳基卤化物和硫醇伙伴的范围包括60多个例子，因此为各种具有药用价值的芳基硫醚结构单元提供了切入点。此外，为证明其实用性，此C-S偶联方案应用于药物合成和活性药物成分的后期修饰。紫外可见光谱和随时间变化的密度泛函理论计算表明，在没有催化剂的情况下，硫醇盐-芳基卤化物电子供体-受体复合物中可见光促进的分子间电荷转移使反应性提高。