Direct C(sp<sup>3</sup>)–H Cross Coupling Enabled by Catalytic Generation of Chlorine Radicals
作者:Benjamin J. Shields、Abigail G. Doyle
DOI:10.1021/jacs.6b08397
日期:2016.10.5
Here we report the development of a C(sp3)-H cross-coupling platform enabled by the catalytic generation of chlorine radicals by nickel and photoredox catalysis. Aryl chlorides serve as both cross-coupling partners and the chlorine radical source for the α-oxy C(sp3)-H arylation of cyclic and acyclic ethers. Mechanistic studies suggest that photolysis of a Ni(III) aryl chloride intermediate, generated
Iron oxide mediated direct C–H arylation/alkylation at α-position of cyclic aliphatic ethers
作者:Parvinder Pal Singh、Satish Gudup、Srinivas Ambala、Umed Singh、Sumit Dadhwal、Baldev Singh、Sanghapal D. Sawant、Ram A. Vishwakarma
DOI:10.1039/c1cc11094b
日期:——
reaction between organometallic species such as alkyl/arylmagnesium halides or organolithium species and alpha-hydrogen bearing cyclic aliphatic ethers via activation of C(sp(3))-H. This is the first example of iron oxide mediateddirect C-C bond formation without expensive or toxic ligands.
Aryl Ketone Mediated Light-Driven Naphthylation of C(sp3)–H Bonds Attached to either Oxygen or Nitrogen Substituents
作者:Shin Kamijo、Masaya Azami、Toshihiro Murafuji
DOI:10.1055/a-1874-4935
日期:2022.10
naphthylation was achieved at C(sp3)–Hbonds attached to either oxygen or nitrogen substituents using sulfonylnaphthalenes as a naphthalene precursor in the presence of 4-benzoylpyridine at ambient temperature. The present transformation is proposed to proceed through the generation of a carbon radical species via chemoselective cleavage of the heteroatom-substituted C(sp3)–H bond by photoexcited 4-benzoylpyridine
Dual-Role Halogen-Bonding-Assisted EDA-SET/HAT Photoreaction System with Phenol Catalyst and Aryl Iodide: Visible-Light-Driven Carbon–Carbon Bond Formation
atom transfer (HAT) enables the direct generation of alkyl radicals. We report a dual-role EDA-SET/HAT photoreaction system for carbon–carbon bond formation using a phenol catalyst and aryl iodide. This system facilitates addition of alkyl radicals generated from ethers, amide, sulfide, and cycloalkane to arenes. Mechanistic studies revealed that EDA complex formation is mediated by halogen bonding