Site-specific allylic C-H bond functionalization with a copper-bound N-centred radical

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Selective C-H bond functionalization is crucial for efficient synthesis, enabling late-stage modifications.
• Hydrogen atom transfer (HAT) is a key strategy for sp³ C-H bond cleavage, but achieving site-selectivity remains challenging.
• Enantioselective trapping of radical intermediates is needed for precise functionalization.

Purpose of the Study:

• To develop a method for site- and enantioselective C-H functionalization.
• To enable the cyanation of allylic C-H bonds in complex alkenes.
• To utilize a copper catalyst and a nitrogen-centered radical for precise hydrogen atom transfer.

Main Methods:

• Copper (Cu)-catalyzed reaction.
• Utilizing a Cu(II)-bound nitrogen (N)-centered radical for site-specific hydrogen atom transfer (HAT).
• Application to a diverse range of alkene-containing molecules.

Main Results:

• Achieved site- and enantioselective allylic C-H cyanation of complex alkenes.
• Demonstrated effectiveness with sterically demanding substrates.
• Successfully applied to natural products and pharmaceuticals.

Conclusions:

• The developed copper-catalyzed method enables precise site- and enantioselective C-H functionalization.
• The key role of the Cu(II)-bound N-centered radical in achieving site-specificity was highlighted.
• This methodology offers a powerful tool for synthesizing complex molecules with high selectivity.