Deoxygenative C(sp³)-N(sp³) Cross-Coupling Enabled by Nickel Metallaphotoredox Catalysis

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Metallaphotoredox catalysis enables radical generation for controlled bond formation.
• Tertiary amine synthesis is challenging due to redox sensitivity and difficult C(sp3)-N(sp3) reductive elimination.

Purpose of the Study:

• To develop a novel deoxygenative C-N cross-coupling method for synthesizing tertiary amines.
• To address the limitations of existing photoredox methods for tertiary amine construction.

Main Methods:

• Utilized metallaphotoredox catalysis for deoxygenative C-N cross-coupling.
• Employed a sterically demanding ancillary ligand to promote reductive elimination.
• Optimized reaction conditions to suppress product oxidation.

Main Results:

• Successfully synthesized diverse tertiary amines from alcohols and N-hydroxylamine esters.
• Demonstrated broad substrate scope, including complex pharmaceutical derivatives.
• Achieved efficient C(sp3)-N(sp3) bond formation under mild conditions.

Conclusions:

• Developed a robust and versatile method for tertiary amine synthesis.
• Overcame key challenges in metallaphotoredox-catalyzed C-N cross-coupling.
• Provides a valuable tool for medicinal chemistry and organic synthesis.