Mechanochemical conditions have been applied to a highly efficient cobalt(III)-catalyzed C–H bond activation for the first time. In a subsequent step to the olefin insertion and β-oxygen elimination, N-pyrimidinylindoles were allylated with vinylethylene carbonates in the absence of organic solvent under high-speed ball-milling condition. As the reaction afforded the desired products in up to 98% yields within a short time, this method constitutes an environmentally friendly and powerful alternative to the common solution-based approaches.

中文翻译：

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钴（III）催化快速和无溶剂的吲哚CH-H烯丙基的机械化学反应

机械化学条件已首次应用于高效钴（III）催化的CH键的活化。在烯烃插入和β-氧消除的后续步骤中，在不存在有机溶剂的情况下，在高速球磨条件下，将N-嘧啶二炔吲哚与碳酸乙烯基亚乙酯烯丙基化。由于该反应可在短时间内以高达98％的产率提供所需的产物，因此该方法构成了对环境的友好且有力的替代方法，可替代基于溶液的常规方法。