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

Science
Chip LeDavid W C MacMillan

Abstract

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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Citations

Dec 6, 2018·Chemical Communications : Chem Comm·Quan-Quan ZhouWen-Jing Xiao
Mar 23, 2019·Chemical Communications : Chem Comm·Euan B McLeanAi-Lan Lee
Aug 11, 2019·Angewandte Chemie·J Luke KoniarczykAndrew McNally
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May 28, 2020·Chemical Communications : Chem Comm·Mingyang LiuBuxing Han
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May 3, 2019·Science·Asik HossainOliver Reiser
Feb 6, 2020·Nature Chemistry·Barry M TrostChao-I Joey Hung
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