The isothiocyanate (NCS) group is an attractive functional group in the field of organic and pharmaceutical chemistry. It can be transformed into other heteroatomic functional groups. It usually acts as the inductive group of biological activity and has also been traditionally used as the fluorescent-labeling reagent. However, it is not compatible with strong bases. When the NCS group is at para position in halobenzenes, it generally undergoes nucleophilic additions upon reaction with strong bases. To the best of our knowledge, there is currently no general methodology for the formation and reactions of NCS-functionalized aryllithiums for meta and para substituents. Herein, we report the continuous-flow generation of NCS-substituted aryllithiums from the corresponding haloarenes via a selective halogen–lithium exchange reaction and its reaction with various electrophiles to yield NCS-containing products. We also achieved an integrated synthesis through sequential reactions of the NCS-containing compounds with additional nucleophiles using the continuous-flow reactors.

中文翻译：

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异硫氰酸酯取代芳基锂的流动化学综合合成

异硫氰酸酯 (NCS) 基团是有机和药物化学领域中一个有吸引力的官能团。它可以转化为其他杂原子官能团。它通常作为生物活性的诱导基团，传统上也被用作荧光标记试剂。但是，它与强碱不兼容。当 NCS 基团位于卤代苯中的对位时，它通常在与强碱反应时发生亲核加成。据我们所知，目前没有用于 NCS 官能化芳基锂的间位和对位取代基的形成和反应的通用方法。在此处，我们报告了通过选择性卤素-锂交换反应从相应的卤代芳烃连续流动生成 NCS 取代的芳基锂及其与各种亲电子试剂的反应，以产生含 NCS 的产物。我们还使用连续流动反应器通过含有 NCS 的化合物与其他亲核试剂的顺序反应实现了综合合成。