Journal
ACS CATALYSIS
Volume 9, Issue 7, Pages 6118-6123Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b01368
Keywords
photoreaction; gold catalysis; radical C-C coupling; desulfurization; blue LEDs
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Funding
- China Scholarship Council (CSC)
- Landesgraduiertenforderung of the state of Baden-Wugrttemberg, Germany
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy) [EXC-2082 - 390761711]
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[Au-2(mu-dppm)(2)]Cl-2-mediated photocatalysis reactions are usually initiated by ultraviolet A (UVA) light; herein, an unreported system using blue light-emitting diodes (LEDs) as excitation light source was found. The red shift of the absorption wavelength originates from the combination of [Au-2(mu-dppm)(2)]Cl-2 and ligand (Ph3P or mercaptan). On the basis of this finding, a gold-catalyzed reductive desulfurizing C-C coupling of electrophilic radicals and styrenes mediated by blue LEDs is presented, a coupling which cannot be efficiently accessed by previously reported methods. This mild and highly efficient C-C bond formation strategy uses mercaptans both as electron-deficient alkyl radical precursor as well as the hydrogen source. Two examples of amino acids have also been modified by using this strategy. Moreover, this methodology could be applied in polymer synthesis. Gram-scale synthesis and mechanistic insights into this transformation are also presented.
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