The direct carboxylation of inert aryl C−H bond catalyzed by abundant and cheap nickel is still facing challenge. Herein, we report the Ni-catalyzed direct carboxylation of aryl C−H bonds in benzamides under 1 atm of CO₂ to afford various methyl carboxylates or phthalimides, dealing with different post-processing. The reaction displays excellent functional group tolerance and affords moderate to high carboxylation yields under mild conditions. Detail mechanistic studies suggest that a Ni(0)−Ni(II)−Ni(I) catalytic cycle may be involved in this reaction.

中文翻译：

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Ni催化CO2催化苯酰胺中芳基C-H键直接羧化

丰富且廉价的镍催化惰性芳基 C-H 键直接羧化仍面临挑战。_{在此，我们报道了在 1 个大气压的 CO 2}下 Ni 催化的苯甲酰胺中芳基 C-H 键的直接羧化反应，得到各种羧酸甲酯或邻苯二甲酰亚胺，并进行了不同的后处理。该反应表现出优异的官能团耐受性，并在温和条件下提供中等至高的羧化产率。详细的机理研究表明，Ni(0)-Ni(II)-Ni(I) 催化循环可能参与该反应。