Catalytic C-H Trifluoromethoxylation of Arenes and Heteroarenes.
Catalytic C-H Trifluoromethoxylation of Arenes and Heteroarenes.
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DOI:
10.1002/anie.201800598
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发表时间:
2018-07-26
期刊:
影响因子:
--
通讯作者:
Ngai MY
中科院分区:
文献类型:
--
作者:
Zheng W;Morales-Rivera CA;Lee JW;Liu P;Ngai MY
The intermolecular C–H trifluoromethoxylation of arenes remains a long-standing and unsolved problem in organic synthesis. Herein, we report the first catalytic protocol employing a novel trifluoromethoxylating reagent and redox-active catalysts for the direct (hetero)aryl C–H trifluoromethoxylation. Our approach is operationally simple, proceeds at room temperature, uses easy-to-handle reagents, requires only 0.03 mol% of redox-active catalysts, does not need specialized reaction apparatus, and tolerates a wide variety of functional groups and complex structures such as sugar and natural product derivatives. Importantly, both ground state and photoexcited redox-active catalysts are effective. Detailed computational and experimental studies suggest a unique reaction pathway where photoexcitation of the trifluoromethoxylating reagent releases the OCF3 radical that is trapped by (hetero)arenes. The resulting cyclohexadienyl radicals are oxidized by redox-active catalysts and deprotonated to form the desired products of trifluoromethoxylation.
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