A practical and scalable metal-free catalytic method for the borylation and borylative dearomatization of heteroarenes has been developed. This synthetic method uses inexpensive and conveniently synthesizable bench-stable precatalysts of the form 1-NHR₂-2-BF₃-C₆H₄, commercially and synthetically accessible heteroarenes as substrates, and pinacolborane as the borylation reagent. The preparation of several borylated heterocycles on 2 and 50 g scales was achieved under solvent-free conditions without the use of Schlenk techniques or a glovebox. A kilogram-scale borylation of one of the heteroarene substrates was also achieved using this cost-effective green methodology to exemplify the fact that our methodology can be conveniently implemented in fine chemical industries.

中文翻译：

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使用无金属路易斯对催化剂的台式稳定前体实用且可扩展地合成硼氢化的杂环

已开发出一种实用且可扩展的无杂芳烃的硼化和硼基脱芳香化的无金属催化方法。这种合成方法使用廉价且可方便合成的1-NHR ₂ -2-BF ₃ -C ₆ H ₄形式的台式稳定型预催化剂。，市售和合成途径可得到的杂芳烃作为底物，频哪醇硼烷作为硼化试剂。在无溶剂条件下，无需使用Schlenk技术或手套箱即可制备2和50 g规模的数个硼化杂环。使用这种经济高效的绿色方法还可以实现其中一种杂芳烃底物的公斤级硼化，这证明了我们的方法可以在精细化工行业中方便地实施的事实。