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
中科院分区:
文献类型:
--
作者:
Heitz DR;Tellis JC;Molander GA
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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