Cu-Catalyzed Direct C6-Arylation of Indoles
2016
Yang, Youqing | Li, Ruirui | Zhao, Yue | Zhao, Dongbing | Shi, Zhuangzhi
The first example of direct and site-selective arylation of indoles at the C6 position has been reported. The key to this high regioselectivity is the appropriate choice of the N–P(O)ᵗBu₂ directing group and the use of diaryliodonium triflate salts as the coupling partners in the presence of catalytic CuO. The protocol is distinguished by mild reaction system that avoids ligand and additives, exhibiting wide scope of indole and arene coupling components without compromising its efficiency and scalability, thus representing a significant advancement in the implementation of regioselective direct arylation of indoles.
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