Photochemical Nickel-Catalyzed C-H Arylation: Synthetic Scope and Mechanistic Investigations.

Photochemical Nickel-Catalyzed C-H Arylation: Synthetic Scope and Mechanistic Investigations.
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DOI:
10.1021/jacs.6b04789
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发表时间:
2016-10-05
影响因子:
15
通讯作者:
Molander GA
Molander GA
中科院分区:
化学1区
文献类型:
--
作者:
Heitz DR;Tellis JC;Molander GA

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铱光催化剂和可见光促进(杂)芳基溴与活化的 α-杂取代或苄基 C(sp3)-H 键在室温下镍催化的偶联。对这一前所未有的转变的机理研究揭示了一种意想不到的机制的可能性,该机制假设涉及激发态镍络合物的 Ni-Br 均裂事件。由此产生的溴自由基被认为可以抽象出弱的 C(sp3)-H 键,从而产生可参与 Ni 催化芳基化反应的反应性烷基自由基。有证据表明,铱光催化剂通过三重态-三重态能量转移促进镍激发和溴自由基产生。
An iridium photocatalyst and visible light facilitate a room temperature, nickel-catalyzed coupling of (hetero)aryl bromides with activated α-heterosubstituted or benzylic C(sp3)–H bonds. Mechanistic investigations on this unprecedented transformation have uncovered the possibility of an unexpected mechanism hypothesized to involve a Ni–Br homolysis event from an excited-state nickel complex. The resultant bromine radical is thought to abstract weak C(sp3)–H bonds to generate reactive alkyl radicals that can be engaged in Ni-catalyzed arylation. Evidence suggests that the iridium photocatalyst facilitates nickel excitation and bromine radical generation via triplet–triplet energy transfer.
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