Silver-catalysed intermolecular benzylic-selective C-H amidation via nitrene transfer.

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Transition metal-catalyzed C-H functionalization is key for synthesizing complex molecules from simple hydrocarbons.
• Late-stage functionalization of complex molecules is crucial in drug discovery and materials science.

Purpose of the Study:

• To develop an intermolecular, non-directed amidation of benzylic C-H bonds.
• To establish a method utilizing inexpensive silver catalysts and a nitrene transfer pathway.

Main Methods:

• Employing silver-based catalysts with varying AgNTf2: tert-butylterpyridine ligand ratios.
• Investigating the catalytic activity of dimeric or trimeric silver complexes.
• Exploring the broad substrate scope including arenes, biaryls, heteroarenes, and complex molecules.

Main Results:

• Successful intermolecular amidation of benzylic C-H bonds via nitrene transfer.
• Demonstrated broad substrate scope with high efficiency and selectivity.
• Identified dimeric or trimeric silver complexes as active catalysts, with reactivity dependent on substrate structure.

Conclusions:

• Developed an operationally simple and cost-effective method for benzylic C-H amidation.
• The method offers a versatile tool for late-stage functionalization of diverse organic molecules.
• Catalyst structure (dimeric/trimeric silver complexes) influences reactivity and selectivity.