An intriguing pyridine‐boryl radical‐mediated C−H alkynylation reaction of inactivated alkanes was described. The reaction features mild operation condition and wide substrate scope, and affords the corresponding products in moderate to good yields. Notably, The presence of 4‐cyanopyride N‐oxide was key to the success of the reaction. Cyclohexane are more easily to be functionalized in this reaction than toluene, which could be rationally explained by polarity‐match principle.

中文翻译：

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硼烷自由基介导的灭活烷烃的CH活化，用于内部炔烃的合成

描述了一个有趣的吡啶-硼基自由基介导的灭活烷烃的CH炔基化反应。该反应具有温和的操作条件和广泛的底物范围，并以中等至良好的产率提供了相应的产物。值得注意的是，4-氰基吡啶N-氧化物的存在是反应成功的关键。环己烷比甲苯更容易在该反应中被官能化，这可以用极性匹配原理合理地解释。