AbstractHerein, we report the reactivity of cobalt(III)‐catalyst towards hydroarylative functionalization of 1,6‐diyne, which has never been explored before. The N‐aryl lactam is the prime substrate that undergoes sp2 C−H bond activation. C−Co(III) bond formation occurs through weakly coordinating lactam group. The reaction mechanism reveals the in‐situ formation of a six‐membered cobaltacycle which undergoes further functionalization with 1,6‐diyne. Also, radical quenching experiments suggest the involvement of the ionic pathway for this conversion. In addition, hydrogen scrambling and kinetic isotope experiments support the proposed mechanism. A wide range of electronically biased substrates and reacting partners work well with this method in a highly atom‐economical fashion.
摘要在此,我们报告了
钴(III)催化剂对 1,6-二炔的加氢官能化的反应活性。N- 芳基内酰胺是发生 sp2 C-H 键活化的主要底物。C-Co(III) 键通过弱配位内酰胺基团形成。反应机理揭示了六元
钴环的原位形成,并与 1,6-二炔进一步官能化。自由基淬灭实验也表明,离子途径参与了这一转化过程。此外,氢扰乱和动力学同位素实验也支持所提出的机制。多种电子偏置基质和反应伙伴都能以原子经济的方式与这种方法很好地结合。