[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Area of Science:

• Photoredox Catalysis
• Organic Synthesis
• Catalyst Development

Background:

• Copper complexes are emerging as efficient photoredox catalysts.
• Iridium and ruthenium catalysts are state-of-the-art but expensive.
• Activation of organic halides is key for radical transformations.

Purpose of the Study:

• To detail the synthesis and characterization of [(DPEPhos)(bcp)Cu]PF6.
• To demonstrate the utility of this copper catalyst in organic synthesis.
• To explore its application in direct arylation and radical cyclization reactions.

Main Methods:

• Synthesis of the copper-based photoredox catalyst [(DPEPhos)(bcp)Cu]PF6.
• Characterization using NMR and spectroscopy.
• Application in direct arylation of N-methylpyrrole and radical cyclization of an iodoquinoline derivative.

Main Results:

• [(DPEPhos)(bcp)Cu]PF6 effectively catalyzes the direct arylation of (hetero)arenes.
• The catalyst promotes radical cyclization of organic halides, including synthesis of natural product luotonin A.
• Successful synthesis of 4-(1-methyl-1H-pyrrol-2-yl)benzonitrile via direct arylation.

Conclusions:

• [(DPEPhos)(bcp)Cu]PF6 is a versatile and cost-effective copper photoredox catalyst.
• It provides a complementary alternative to precious metal catalysts for radical reactions.
• Detailed protocols and scope are discussed for synthetic applications.