A radical approach to the copper oxidative addition problem: Trifluoromethylation of bromoarenes.

A radical approach to the copper oxidative addition problem: Trifluoromethylation of bromoarenes.
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DOI:
10.1126/science.aat4133
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发表时间:
2018-06-01
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
MacMillan DWC
MacMillan DWC
中科院分区:
其他
文献类型:
--
作者:
Le C;Chen TQ;Liang T;Zhang P;MacMillan DWC

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Transition metal–catalyzed arene functionalization has been widely used for molecular synthesis over the past century. In this arena, copper catalysis has long been considered a privileged platform due to the propensity of high-valent copper to undergo reductive elimination with a wide variety of coupling fragments. However, the sluggish nature of oxidative addition has limited copper’s capacity to broadly facilitate haloarene coupling protocols. Here, we demonstrate that this copper oxidative addition problem can be overcome with an aryl radical–capture mechanism, wherein the aryl radical is generated through a silyl radical halogen abstraction. This strategy was applied to a general trifluoromethylation of aryl bromides through dual copper-photoredox catalysis. Mechanistic studies support the formation of an open-shell aryl species.
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