Site-selective aliphatic C-H bromination using N-bromoamides and visible light

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Catalysis

Background:

• Selective functionalization of aliphatic C-H bonds is crucial for efficient synthesis of complex molecules.
• Existing intermolecular C-H functionalization methods with preparative value are limited.
• Aliphatic C-H bonds are generally unreactive and challenging to functionalize selectively.

Purpose of the Study:

• To develop a novel, selective intermolecular method for aliphatic C-H bromination.
• To utilize readily available N-bromoamide reagents and visible light for this transformation.
• To provide a convenient and broadly applicable synthetic route to functionalized aliphatic compounds.

Main Methods:

• Visible-light mediated radical halogenation.
• Utilizing N-bromoamide reagents for C-H bromination.
• Employing substrate as the limiting reagent for high yields.

Main Results:

• Achieved selective bromination of unactivated aliphatic C-H bonds.
• Demonstrated useful chemical yields with substrate as the limiting reagent.
• Exhibited site selectivities comparable or superior to existing intermolecular C-H functionalization methods.

Conclusions:

• This visible-light mediated C-H bromination offers a convenient and highly selective method.
• The approach provides a valuable tool for streamlining the synthesis of complex molecules.
• The generated alkyl bromides serve as versatile synthetic intermediates for further transformations.